Nextjs Tutorial

What is Next.js?

Next.js is a powerful React framework that enables functionalities such as server-side rendering, static site generation, and API routes out-of-the-box. It simplifies routing, improves performance, and offers excellent developer experience.

        <!-- Next.js is not written like this in HTML but installed as a project using Node.js -->
        <!-- Example: Create a Next.js app -->
        npx create-next-app@latest my-nextjs-app
      

Benefits over React

Unlike React which is only a library for building UI, Next.js comes with routing, server-side rendering (SSR), static generation, and performance optimizations built-in.

        <!-- Benefits include: -->
        - File-based routing
        - SSR and SSG support
        - API routes
        - Improved performance with Image Optimization
        - Built-in CSS and Sass support
      

Project Structure Overview

Next.js uses a conventional folder structure. Key folders include:

        <!-- Folder structure after creating a Next.js app -->
        my-nextjs-app/
        ├── pages/          <!-- Contains all route-related React components -->
        ├── public/         <!-- Static assets like images and favicon go here -->
        ├── styles/         <!-- Global and modular CSS files -->
        ├── node_modules/   <!-- Installed packages -->
        └── next.config.js  <!-- Configuration file for Next.js -->
      

Installing Next.js

To install Next.js, Node.js must be installed first. You can then use the command below:

        <!-- Command to install Next.js -->
        npx create-next-app@latest
        <!-- or with a project name -->
        npx create-next-app@latest my-app
      

First Next.js App

Once created, you can run the development server using:

        <!-- Navigate into the directory and run -->
        cd my-app
        npm run dev
        <!-- Output -->
        > Ready on http://localhost:3000
      

Pages and Routing Basics

Each file inside the pages/ directory automatically becomes a route.

        <!-- pages/index.js becomes '/' -->
        export default function Home() {
          return <h1>Welcome to Home Page</h1>; <!-- Displayed on / -->
        }

        <!-- pages/about.js becomes '/about' -->
        export default function About() {
          return <h1>About Us Page</h1>; <!-- Displayed on /about -->
        }
      

Public vs Private Folders

The public/ folder is used for static files accessible by URL. Other files are private and not accessible directly by browser.

        <!-- Example: placing image in public folder -->
        public/logo.png

        <!-- Access in JSX -->
        <img src="/logo.png" alt="Logo" />

        <!-- Files outside public/ are not directly accessible -->
      

Linking Between Pages

Next.js provides a built-in Link component to navigate between pages without full page reloads.

        <!-- Example of linking from one page to another -->
        import Link from 'next/link';

        export default function Home() {
          return (
            <div>
              <h1>Home Page</h1>
              <Link href="/about">
                <a>Go to About Page</a>
              </Link>
            </div>
          );
        }
      

Styling with CSS

You can use global CSS or module CSS for scoped styles. Modules are recommended for component-level styles.

        <!-- styles/Home.module.css -->
        .title {
          color: blue;
          font-size: 30px;
        }

        <!-- Importing in component -->
        import styles from '../styles/Home.module.css';

        export default function Home() {
          return <h1 className={styles.title}>Styled Heading</h1>;
        }
      

Environment Setup Best Practices

Use .env.local for storing environment variables. Keep secrets out of version control.

        <!-- .env.local -->
        NEXT_PUBLIC_API_URL=https://api.example.com

        <!-- Access in code -->
        const apiUrl = process.env.NEXT_PUBLIC_API_URL;
      

File-based Routing

Next.js uses the file system to define routes. Each file inside the pages/ folder becomes a route automatically.

        <!-- pages/index.js maps to '/' -->
        export default function Home() {
          return <h1>Home Page</h1>;
        }

        <!-- pages/about.js maps to '/about' -->
        export default function About() {
          return <h1>About Page</h1>;
        }
      

Dynamic Routes

Dynamic routes are created using square brackets in the filename. Useful for user profiles, blog posts, etc.

        <!-- pages/user/[id].js handles routes like /user/1 or /user/abc -->
        import { useRouter } from 'next/router';

        export default function User() {
          const router = useRouter();
          const { id } = router.query; <!-- Access dynamic route parameter -->
          return <h1>User ID: {id}</h1>;
        }
      

Nested Routes

To create nested routes, use folders inside the pages/ directory.

        <!-- pages/blog/index.js becomes /blog -->
        <!-- pages/blog/post.js becomes /blog/post -->

        // pages/blog/index.js
        export default function Blog() {
          return <h1>Blog Home</h1>;
        }

        // pages/blog/post.js
        export default function Post() {
          return <h1>Blog Post Page</h1>;
        }
      

Catch-All Routes

Catch-all routes match multiple segments. Use three dots inside brackets.

        <!-- pages/docs/[...params].js matches /docs/a, /docs/a/b/c etc. -->
        import { useRouter } from 'next/router';

        export default function Docs() {
          const router = useRouter();
          const { params = [] } = router.query;

          return (
            <div>
              <h1>Catch-All Params:</h1>
              <ul>
                {params.map((param, i) => (
                  <li key={i}>{param}</li>
                ))}
              </ul>
            </div>
          );
        }
      

Route Groups ((group))

Route groups (folder names in double parentheses) help organize code but do not affect URL paths.

        <!-- app/((auth))/login/page.js renders on /login, not /auth/login -->
        export default function LoginPage() {
          return <h1>Login Page</h1>;
        }
      

Layout Routes (@layout.js)

Layouts can be shared across multiple pages using special @layout.js files in the app/ directory.

        <!-- app/layout.js applies to all nested pages -->
        export default function RootLayout({ children }) {
          return (
            <html>
              <body>
                <header>Site Header</header>
                {children}
                <footer>Site Footer</footer>
              </body>
            </html>
          );
        }
      

Custom 404 Page

Next.js supports custom 404 pages by creating a pages/404.js file.

        <!-- pages/404.js -->
        export default function Custom404() {
          return <h1>404 - Page Not Found</h1>;
        }
      

Middleware for Routes

Middleware allows you to run logic before rendering pages. Useful for redirects, auth checks, etc.

        <!-- middleware.js at root level -->
        import { NextResponse } from 'next/server';

        export function middleware(request) {
          const isLoggedIn = false; <!-- Replace with real auth logic -->

          if (!isLoggedIn && request.nextUrl.pathname.startsWith('/dashboard')) {
            return NextResponse.redirect(new URL('/login', request.url));
          }

          return NextResponse.next();
        }
      

Redirects and Rewrites

Configure URL redirects or rewrites in next.config.js.

        // next.config.js
        module.exports = {
          async redirects() {
            return [
              {
                source: '/old-path',
                destination: '/new-path',
                permanent: true,
              },
            ];
          },
          async rewrites() {
            return [
              {
                source: '/api/:path*',
                destination: 'https://externalapi.com/:path*',
              },
            ];
          },
        };
      

Programmatic Navigation

Use the useRouter() hook to navigate programmatically between routes.

        import { useRouter } from 'next/router';

        export default function NavigateButton() {
          const router = useRouter();

          const goToAbout = () => {
            router.push('/about'); <!-- Navigates to /about -->
          };

          return <button onClick={goToAbout}>Go to About</button>;
        }
      

Shared Layouts

Shared layouts provide consistent structure (header, footer, sidebar) across multiple pages using layout wrappers.

        // components/Layout.js
        export default function Layout({ children }) {
          return (
            <div>
              <header>My App Header</header>
              <main>{children}</main>
              <footer>My App Footer</footer>
            </div>
          );
        }

        // pages/_app.js
        import Layout from '../components/Layout';

        export default function MyApp({ Component, pageProps }) {
          return (
            <Layout>
              <Component {...pageProps} />
            </Layout>
          );
        }
      

Creating Layout Components

Layout components break down page structure into reusable parts such as headers, footers, and sidebars.

        // components/Header.js
        export default function Header() {
          return <header>Site Header</header>;
        }

        // components/Footer.js
        export default function Footer() {
          return <footer>Site Footer</footer>;
        }

        // components/Layout.js
        import Header from './Header';
        import Footer from './Footer';

        export default function Layout({ children }) {
          return (
            <>
              <Header />
              {children}
              <Footer />
            </>
          );
        }
      

Head and Meta Tags

Use the next/head component to insert page-specific metadata like titles and meta descriptions.

        import Head from 'next/head';

        export default function AboutPage() {
          return (
            <>
              <Head>
                <title>About Us</title>
                <meta name="description" content="Learn more about us." />
              </Head>
              <h1>About</h1>
            </>
          );
        }
      

Navbar and Footer

Define navigation and footer components for consistent user experience across pages.

        // components/Navbar.js
        import Link from 'next/link';

        export default function Navbar() {
          return (
            <nav>
              <Link href="/">Home</Link> | 
              <Link href="/about">About</Link>
            </nav>
          );
        }

        // components/Footer.js
        export default function Footer() {
          return <footer>© 2025 MyApp</footer>;
        }
      

Reusable UI Components

Create flexible UI elements like buttons or cards that can be reused throughout the app.

        // components/Button.js
        export default function Button({ label, onClick }) {
          return <button onClick={onClick}>{label}</button>;
        }

        // Usage
        <Button label="Click Me" onClick={() => alert('Clicked!')} />
      

Using Props

Props allow you to pass data into components from parent to child for dynamic rendering.

        // components/Greeting.js
        export default function Greeting({ name }) {
          return <p>Hello, {name}!</p>;
        }

        // Usage
        <Greeting name="Alice" />
      

Global Styles

Use global CSS or CSS Modules to style your app consistently. Define global styles in styles/globals.css.

        // styles/globals.css
        body {
          font-family: sans-serif;
          background: #f8f9fa;
        }

        // pages/_app.js
        import '../styles/globals.css';

        export default function MyApp({ Component, pageProps }) {
          return <Component {...pageProps} />;
        }
      

Dynamic Layouts per Page

You can conditionally use different layouts by adding a getLayout function per page.

        // pages/about.js
        const About = () => <h1>About Us</h1>;

        About.getLayout = function getLayout(page) {
          return (
            <div style={{ border: '2px solid blue' }}>
              <h2>Custom Layout</h2>
              {page}
            </div>
          );
        };

        export default About;

        // pages/_app.js
        export default function MyApp({ Component, pageProps }) {
          const getLayout = Component.getLayout || ((page) => page);
          return getLayout(<Component {...pageProps} />);
        }
      

Conditional Rendering

Use conditions (if, ternary, &&) to render UI based on logic such as user status or state.

        export default function Dashboard({ isLoggedIn }) {
          return (
            <div>
              {isLoggedIn ? <p>Welcome back!</p> : <p>Please log in.</p>}
            </div>
          );
        }
      

Theme Switcher (Light/Dark Mode)

Switch themes using context, CSS classes, or Tailwind dark mode utilities.

        // components/ThemeSwitcher.js
        import { useState } from 'react';

        export default function ThemeSwitcher() {
          const [dark, setDark] = useState(false);

          return (
            <div className={dark ? 'dark-mode' : 'light-mode'}>
              <button onClick={() => setDark(!dark)}>
                Switch to {dark ? 'Light' : 'Dark'} Mode
              </button>
              <p>Current theme: {dark ? 'Dark' : 'Light'}</p>
            </div>
          );
        }

        // styles (e.g. global.css or inline)
        .dark-mode {
          background: black;
          color: white;
        }

        .light-mode {
          background: white;
          color: black;
        }
      

Static Generation (getStaticProps)

Pre-renders the page at build time. Ideal for static content that doesn't change often.

        // pages/posts.js
        export async function getStaticProps() {
          const res = await fetch('https://jsonplaceholder.typicode.com/posts');
          const posts = await res.json();

          return {
            props: { posts },
          };
        }

        export default function Posts({ posts }) {
          return (
            <ul>
              {posts.map(post => (
                <li key={post.id}>{post.title}</li>
              ))}
            </ul>
          );
        }
      

Server-side Rendering (getServerSideProps)

Fetches data on every request. Good for dynamic data that changes frequently.

        // pages/news.js
        export async function getServerSideProps() {
          const res = await fetch('https://api.example.com/news');
          const news = await res.json();

          return {
            props: { news },
          };
        }

        export default function News({ news }) {
          return (
            <div>
              {news.map(item => (
                <p key={item.id}>{item.title}</p>
              ))}
            </div>
          );
        }
      

Incremental Static Regeneration (ISR)

Update static pages after build time by specifying a revalidate interval.

        // pages/blog.js
        export async function getStaticProps() {
          const res = await fetch('https://api.example.com/blog');
          const data = await res.json();

          return {
            props: { data },
            revalidate: 10, // Regenerate page every 10 seconds
          };
        }

        export default function Blog({ data }) {
          return (
            <div>
              {data.map(post => (
                <h2 key={post.id}>{post.title}</h2>
              ))}
            </div>
          );
        }
      

Client-side Fetching

Use useEffect and useState to fetch data after the component mounts.

        import { useEffect, useState } from 'react';

        export default function Users() {
          const [users, setUsers] = useState([]);

          useEffect(() => {
            fetch('https://jsonplaceholder.typicode.com/users')
              .then(res => res.json())
              .then(data => setUsers(data));
          }, []);

          return (
            <ul>
              {users.map(user => (
                <li key={user.id}>{user.name}</li>
              ))}
            </ul>
          );
        }
      

Fetching from REST API

Call external RESTful endpoints using fetch, axios, etc.

        import { useEffect, useState } from 'react';
        import axios from 'axios';

        export default function Products() {
          const [products, setProducts] = useState([]);

          useEffect(() => {
            axios.get('https://fakestoreapi.com/products')
              .then(res => setProducts(res.data));
          }, []);

          return (
            <ul>
              {products.map(p => (
                <li key={p.id}>{p.title}</li>
              ))}
            </ul>
          );
        }
      

Fetching from GraphQL API

Use libraries like Apollo Client or simple fetch to query GraphQL APIs.

        // Sample GraphQL Query using fetch
        const query = `
          {
            countries {
              code
              name
            }
          }
        `;

        export default function GraphQLExample() {
          const [data, setData] = useState([]);

          useEffect(() => {
            fetch('https://countries.trevorblades.com/', {
              method: 'POST',
              headers: { 'Content-Type': 'application/json' },
              body: JSON.stringify({ query }),
            })
              .then(res => res.json())
              .then(result => setData(result.data.countries));
          }, []);

          return (
            <ul>
              {data.map(c => (
                <li key={c.code}>{c.name}</li>
              ))}
            </ul>
          );
        }
      

SWR (Stale-While-Revalidate)

A React hook for fetching data. Returns cached data first and revalidates in background.

        import useSWR from 'swr';

        const fetcher = url => fetch(url).then(res => res.json());

        export default function Profile() {
          const { data, error } = useSWR('/api/user', fetcher);

          if (error) return <div>Failed to load</div>;
          if (!data) return <div>Loading...</div>;

          return <div>Hello, {data.name}</div>;
        }
      

React Query in Next.js

React Query helps with caching, pagination, background refetching, etc.

        import { useQuery } from '@tanstack/react-query';

        const fetchUsers = async () => {
          const res = await fetch('https://jsonplaceholder.typicode.com/users');
          return res.json();
        };

        export default function Users() {
          const { data, isLoading, error } = useQuery({
            queryKey: ['users'],
            queryFn: fetchUsers,
          });

          if (isLoading) return <div>Loading...</div>;
          if (error) return <div>Error!</div>;

          return (
            <ul>
              {data.map(u => (
                <li key={u.id}>{u.name}</li>
              ))}
            </ul>
          );
        }
      

Caching Strategies

Control caching behavior with HTTP headers, SWR, React Query, or ISR. Choose between stale-while-revalidate, client memory, or API-side caching.

        // Example: ISR with cache-time of 30 seconds
        export async function getStaticProps() {
          const res = await fetch('https://api.example.com/data');
          const data = await res.json();

          return {
            props: { data },
            revalidate: 30,
          };
        }
      

Error Handling in Fetching

Always handle loading, error, and empty states in your fetch logic for a better user experience.

        import { useEffect, useState } from 'react';

        export default function SafeFetch() {
          const [data, setData] = useState(null);
          const [loading, setLoading] = useState(true);
          const [error, setError] = useState(null);

          useEffect(() => {
            fetch('https://api.example.com/data')
              .then(res => {
                if (!res.ok) throw new Error('Network error');
                return res.json();
              })
              .then(data => {
                setData(data);
                setLoading(false);
              })
              .catch(err => {
                setError(err.message);
                setLoading(false);
              });
          }, []);

          if (loading) return <p>Loading...</p>;
          if (error) return <p>Error: {error}</p>;

          return <pre>{JSON.stringify(data, null, 2)}</pre>;
        }
      

Creating API Endpoints

Request and Response Object

Routing in pages/api

Dynamic API Routes

Handling POST/GET

Custom Headers

Rate Limiting

Connecting to a Database

Using Third-party APIs

Authentication in APIs

Recap

• API routes live in pages/api as serverless functions.
• Handle requests and responses with req and res.
• Support dynamic routing, HTTP methods, headers, and authentication.
• Connect to databases and third-party services easily.

Global CSS

<!-- styles/globals.css -->
body {

  background-color: #f0f0f0;

  font-family: Arial, sans-serif;

}
      

<!-- pages/_app.js -->

import '../styles/globals.css';

export default function App({ Component, pageProps }) {

  return <Component {...pageProps} />;

}
      

CSS Modules

<!-- styles/Button.module.css -->
.button {

  background-color: blue;

  color: white;

  padding: 10px 20px;

  border: none;

  border-radius: 5px;

}
      

<!-- components/Button.js -->

import styles from '../styles/Button.module.css';

export default function Button() {

  return <button className={styles.button}>Click Me</button>;

}
      

Tailwind CSS Integration

<!-- Example usage in a component -->

export default function Card() {

  return <div className="p-6 max-w-sm mx-auto bg-white rounded-xl shadow-md flex items-center space-x-4">

    <div>

      <h1 className="text-xl font-medium text-black">Tailwind Card</h1>

      <p className="text-gray-500">Utility-first styling!</p>

    </div>

  </div>

}
      

Styled Components

import styled from 'styled-components';

const Button = styled.button`

  background: palevioletred;

  color: white;

  padding: 10px 20px;

  border-radius: 5px;

`;

export default function StyledButton() {

  return <Button>Styled Components</Button>;

}
      

Emotion CSS-in-JS

/** @jsxImportSource @emotion/react */

import { css } from '@emotion/react';

const style = css`

  background-color: lightblue;

  padding: 10px;

  border-radius: 5px;

`;

export default function EmotionBox() {

  return <div css={style}>Emotion Styled Box</div>;

}
      

SCSS / SASS Support

<!-- styles/Button.module.scss -->
$primary-color: #0070f3;

.button {

  background-color: $primary-color;

  color: white;

  padding: 10px 20px;

}
      

Responsive Design

<!-- Example responsive style in CSS Modules -->
.container {

  width: 100%;

  }@media (min-width: 768px) {

    width: 50%;

  }

}
      

Animations with Framer Motion

import { motion } from 'framer-motion';

export default function AnimatedBox() {

  return <motion.div

    initial={{ opacity: 0 }}

    animate={{ opacity: 1 }}

    transition={{ duration: 1 }}

    style={{ width: 100, height: 100, backgroundColor: 'red' }}

  ></motion.div>

}
      

Theming System

const themes = {

  light: { background: '#fff', color: '#000' },

  dark: { background: '#000', color: '#fff' },

};

export default function ThemeSwitcher() {

  const [theme, setTheme] = React.useState('light');

  return <div style={{ background: themes[theme].background, color: themes[theme].color, padding: '20px' }}>

    <button onClick={() => setTheme(theme === 'light' ? 'dark' : 'light')}>Toggle Theme</button>

    Current theme: {theme}

  </div>

}
      

Utility-First CSS vs Component Styles

Local State with useState

import React, { useState } from 'react';

export default function Counter() {

let [count, setCount] = useState(0);

return (<

  button onClick={() => setCount(count + 1)}>Clicked {count} times</button>

);

}
      

Global State with Context API

import React, { createContext, useContext, useState } from 'react';

const CountContext = createContext();

export function CountProvider({ children }) {

let [count, setCount] = useState(0);

return (<CountContext.Provider value={{ count, setCount }}>{children}</CountContext.Provider>);

}

export function useCount() { return useContext(CountContext); }
      

Zustand for Global State

import create from 'zustand';

const useStore = create(set => ({

count: 0,

increment: () => set(state => ({ count: state.count + 1 }))

}));

export default function Counter() {

let count = useStore(state => state.count);

let increment = useStore(state => state.increment);

return (<button onClick={increment}>Count: {count}</button>);

}
      

Redux Toolkit Integration

import { configureStore, createSlice } from '@reduxjs/toolkit';

const counterSlice = createSlice({

  name: 'counter',

  initialState: 0,

  reducers: { increment: state => state + 1 }

});

const store = configureStore({ reducer: counterSlice.reducer });

export default store;
      

React Query for Server State

import { useQuery } from 'react-query';

function fetchTodos() { return fetch('/api/todos').then(res => res.json()); }

export default function Todos() {

let { data, error, isLoading } = useQuery('todos', fetchTodos);

if (isLoading) return <p>Loading...</p>;

if (error) return <p>Error!</p>;

return (<ul>{data.map(todo => <li key={todo.id}>{todo.title}</li>)}</ul>);

}
      

Form State Management

import React, { useState } from 'react';

export default function Form() {

let [name, setName] = useState('');

return (<

  form onSubmit={e => { e.preventDefault(); alert(name); }}>

    input value={name} onChange={e => setName(e.target.value)} placeholder="Enter name" />

    button type="submit">Submit</button>

  /form>

);

}
      

Persisting State in LocalStorage

import React, { useState, useEffect } from 'react';

export default function PersistentCounter() {

let [count, setCount] = useState(() => parseInt(localStorage.getItem('count')) || 0);

useEffect(() => { localStorage.setItem('count', count); }, [count]);

return (<

  button onClick={() => setCount(count + 1)}>Count: {count}</button>

);

}
      

Shared State Across Pages

import { useContext } from 'react';

import { CountContext } from '../context/CountContext';

export default function Page() {

let { count, setCount } = useContext(CountContext);

return (<

  button onClick={() => setCount(count + 1)}>Shared Count: {count}</button>

);

}
      

Debounced State Updates

import React, { useState, useEffect } from 'react';

function useDebounce(value, delay) {

let [debounced, setDebounced] = useState(value);

useEffect(() => {

let handler = setTimeout(() => setDebounced(value), delay);

return () => clearTimeout(handler);

}, [value, delay]);

return debounced;

}

export default function Search() {

let [query, setQuery] = useState('');

let debouncedQuery = useDebounce(query, 500);

// Use debouncedQuery to fetch API

return (<

  input value={query} onChange={e => setQuery(e.target.value)} placeholder="Search" />

);

}
      

Middleware-Enhanced State

import { configureStore, getDefaultMiddleware } from '@reduxjs/toolkit';

const loggerMiddleware = store => next => action => {

console.log('Dispatching:', action);

let result = next(action);

console.log('Next state:', store.getState());

return result;

};

const store = configureStore({

reducer: rootReducer,

middleware: getDefaultMiddleware().concat(loggerMiddleware)

});

export default store;
      

Controlled vs Uncontrolled Forms

/* Controlled input example */

function ControlledInput() {

  const [value, setValue] = React.useState('');

  return (<

    input value={value} onChange={e => setValue(e.target.value)} />

  );

}
      

/* Uncontrolled input example */

function UncontrolledInput() {

  const inputRef = React.useRef(null);

  const handleClick = () => alert(inputRef.current.value);

  return (<

    >input ref={inputRef} />

    button onClick={handleClick}>Show Value</button>

  );

}
      

useState for Forms

function Form() {

  const [formData, setFormData] = React.useState({ name: '', email: '' });

  const handleChange = e => {

    setFormData({ ...formData, [e.target.name]: e.target.value });

  };

  return (<

    form>

      input name="name" value={formData.name} onChange={handleChange} />

      input name="email" value={formData.email} onChange={handleChange} />

    /form>

  );

}
      

useRef for Form Inputs

function FormWithRef() {

  const nameRef = React.useRef();

  const emailRef = React.useRef();

  const handleSubmit = e => {

    e.preventDefault();

    alert(`Name: ${nameRef.current.value}, Email: ${emailRef.current.value}`);

  };

  return (<

    form onSubmit={handleSubmit}>

      input ref={nameRef} name="name" />

      input ref={emailRef} name="email" />

      button type="submit">Submit</button>

    /form>

  );

}
      

React Hook Form Setup

import { useForm } from 'react-hook-form';

function HookForm() {

  const { register, handleSubmit, formState: { errors } } = useForm();

  const onSubmit = data => console.log(data);

  return (<

    form onSubmit={handleSubmit(onSubmit)}>

      input {...register('name', { required: true })} />

      {errors.name && <span>Name is required</span>}

      button type="submit">Submit</button>

    /form>

  );

}
      

Form Validation with Yup

import * as yup from 'yup';

const schema = yup.object().shape({

  name: yup.string().required(),

  email: yup.string().email().required()

});

// Integrate with React Hook Form using yupResolver

      

Custom Validation

function validateEmail(email) {

  return email.includes('@');

}

function Form() {

  const [email, setEmail] = React.useState('');

  const [error, setError] = React.useState(null);

  const handleChange = e => {

    setEmail(e.target.value);

    setError(validateEmail(e.target.value) ? null : 'Invalid email');

  };

  return (<

    >input value={email} onChange={handleChange} />

    {error && <span>{error}</span>}

  );

}
      

Multi-Step Forms

function MultiStep() {

  const [step, setStep] = React.useState(1);

  return (<

    div>

      {step === 1 ? <Step1 next={() => setStep(2)} /> : <Step2 prev={() => setStep(1)} />}

    /div>

  );

}
      

File Upload Forms

function FileUpload() {

  const [file, setFile] = React.useState(null);

  const handleChange = e => setFile(e.target.files[0]);

  return (<

    input type="file" onChange={handleChange} />

    {file && <p>Selected: {file.name}</p>}

  );

}
      

Form Submission to API

function SubmitForm() {

  const [name, setName] = React.useState('');

  const handleSubmit = e => {

    e.preventDefault();

    fetch('/api/submit', {

      method: 'POST',

      headers: { 'Content-Type': 'application/json' },

      body: JSON.stringify({ name })

    });

  };

  return (<

    form onSubmit={handleSubmit}>

      input value={name} onChange={e => setName(e.target.value)} />

      button type="submit">Submit</button>

    /form>

  );

}
      

UX Tips for Forms

Understanding Auth Flows

NextAuth.js Overview

import NextAuth from 'next-auth';

import GoogleProvider from 'next-auth/providers/google';

export default NextAuth({

  providers: [

    GoogleProvider({

      clientId: process.env.GOOGLE_ID,

      clientSecret: process.env.GOOGLE_SECRET,

    }),

  ],

});
      

Social Logins (Google, GitHub)

Credentials-based Auth

import NextAuth from 'next-auth';

import CredentialsProvider from 'next-auth/providers/credentials';

export default NextAuth({

  providers: [

    CredentialsProvider({

      async authorize(credentials) {

        const user = await checkUser(credentials.email, credentials.password);

        if (user) {

          return user;

        } else {

          return null;

        }

      },

    }),

  ],

});
      

Protecting API Routes

import { getSession } from 'next-auth/react';

export default async (req, res) => {

  const session = await getSession({ req });

  if (!session) {

    return res.status(401).json({ error: 'Unauthorized' });

  }

  res.status(200).json({ message: 'Authorized access' });

};
      

Session Management

Role-based Access Control

if (session.user.role !== 'admin') {

  return res.status(403).json({ error: 'Forbidden' });

}
      

Client vs Server Auth

JWT Handling

import jwt from 'jsonwebtoken';

const token = jwt.sign({ userId: user.id }, process.env.JWT_SECRET, { expiresIn: '1h' });

const decoded = jwt.verify(token, process.env.JWT_SECRET);

      

Custom Auth Implementation

Vercel Deployment

# Deploy your Next.js app with Vercel CLI

vercel login

vercel --prod

      

Static vs Server-rendered Deploy

Custom Domains

Environment Variables

# In .env.local

NEXT_PUBLIC_API_URL=https://api.example.com


# Access in code

const apiUrl = process.env.NEXT_PUBLIC_API_URL;

      

Vercel Analytics

Deploying to Netlify

# Install Next.js plugin for Netlify

npm install @netlify/plugin-nextjs


# Add to netlify.toml

[[plugins]]

package = "@netlify/plugin-nextjs"

      

Using Docker with Next.js

# Dockerfile example

FROM node:18-alpine

WORKDIR /app

COPY package.json yarn.lock ./

RUN yarn install --production

COPY . .

RUN yarn build

EXPOSE 3000

CMD ["yarn", "start"]

      

CDN Caching

Preview Deployments

CI/CD Integration

# GitHub Actions example snippet

jobs:

  build:

    runs-on: ubuntu-latest

    steps:

      - uses: actions/checkout@v2

      - name: Install Dependencies

        run: yarn install

      - name: Build

        run: yarn build

      - name: Deploy to Vercel

        run: vercel --prod --token ${{ secrets.VERCEL_TOKEN }}

      

Using next/head

import Head from 'next/head';

export default function Home() {

  return (

    <div>

      <Head>

        <title>My Awesome Page</title>

        <meta name="description" content="Welcome to my awesome page." />

      </Head>

      <h1>Hello World</h1>

    </div>

  );

}
      

Open Graph Meta Tags

<Head>

  <meta property="og:title" content="My Awesome Page" />

  <meta property="og:description" content="Welcome to my awesome page." />

  <meta property="og:image" content="https://example.com/image.png" />

</Head>
      

Structured Data (Schema.org)

<Head>

  <script type="application/ld+json">{`

    {

      "@context": "https://schema.org",

      "@type": "Organization",

      "name": "My Company",

      "url": "https://mycompany.com",

      "logo": "https://mycompany.com/logo.png"

    }

  `}</script>

</Head>
      

Dynamic SEO Content

Robots.txt & Sitemap

# public/robots.txt

User-agent: *

Disallow:


# public/sitemap.xml


      

Canonical Tags

<Head>

  <link rel="canonical" href="https://example.com/current-page" />

</Head>
      

Lighthouse SEO Tips

Social Sharing Optimization

Avoiding Duplicate Content

Performance & SEO

next/image Component

import Image from 'next/image';

export default function MyImage() {

  return (

    <Image

      src="/me.png"

      alt="Picture of me"

      width={500}

      height={500}

    />

  );

}
      

Responsive Images

<Image

  src="/photo.jpg"

  alt="Photo"

  layout="responsive"

  width={700}

  height={475}

/>
      

Lazy Loading

External Image Domains

module.exports = {

  images: {

    domains: ['example.com'],

  },

};
      

Image Caching

Blur Placeholders

<Image

  src="/photo.jpg"

  alt="Photo"

  width={700}

  height={475}

  placeholder="blur"

  blurDataURL="data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQ..."

/>
      

AVIF and WebP Support

CDN-backed Images

SVG Handling

Optimization Strategies

Lazy Loading Components

import dynamic from 'next/dynamic';

const LazyComponent = dynamic(() => import('./LazyComponent'));

export default function Page() {

  return <LazyComponent />;

}
      

Dynamic Imports

const SomeModule = dynamic(() => import('./SomeModule'));

export default function Home() {

  return <SomeModule />;

}
      

Code Splitting

Bundle Analyzer

npm install @next/bundle-analyzer

# then add config in next.config.js

const withBundleAnalyzer = require('@next/bundle-analyzer')({

  enabled: process.env.ANALYZE === 'true',

});

module.exports = withBundleAnalyzer({});

      

Image Optimization

Preloading Critical Resources

Reducing JavaScript Payload

Avoiding Unused CSS

Lighthouse Auditing

Web Vitals Monitoring

What is Middleware?

export function middleware(request) {

  // runs before every request

  return NextResponse.next();

}
      

Middleware for Authentication

import { NextResponse } from 'next/server';

export function middleware(request) {

  const token = request.cookies.get('token');

  if (!token) {

    return NextResponse.redirect('/login');

  }

  return NextResponse.next();

}
      

Redirect Logic

Middleware in middleware.ts

Using Cookies in Middleware

const cookie = request.cookies.get('session');

// use or set cookies

      

Edge API Routes

Streaming Responses

Third-party Logging

Rate Limiting with Middleware

Geo-based Middleware

Next.js i18n Setup

module.exports = {

  i18n: {

    locales: ['en', 'fr', 'de'],

    defaultLocale: 'en',

  },

};

      

Language Switching

import { useRouter } from 'next/router';

const router = useRouter();

const changeToFrench = () => {

  router.push(router.pathname, router.asPath, { locale: 'fr' });

};

      

Localized Routing

Static Translations

/locales/en/common.json

{

  "welcome": "Welcome",

  "hello": "Hello World"

}

      

Dynamic Translations

Detecting User Language

Date and Number Formatting

const date = new Date();

const formattedDate = new Intl.DateTimeFormat('fr-FR').format(date);

console.log(formattedDate);

      

Multi-language SEO

Using i18next

External CMS for Translations

What is Headless CMS?

Integrating with Contentful

import { createClient } from 'contentful';

const client = createClient({

  space: 'your_space_id',

  accessToken: 'your_access_token',

});

export async function getStaticProps() {

  const entries = await client.getEntries();

  return { props: { entries: entries.items } };

}

      

Integrating with Sanity.io

import sanityClient from '@sanity/client';

const client = sanityClient({

  projectId: 'your_project_id',

  dataset: 'production',

  useCdn: true,

});

export async function getStaticProps() {

  const data = await client.fetch('*[_type == "post"]');

  return { props: { posts: data } };

}

      

Integrating with Strapi

export async function getStaticProps() {

  const res = await fetch('https://your-strapi-url/api/posts');

  const data = await res.json();

  return { props: { posts: data.data } };

}

      

Using Notion as CMS

Markdown Content with MDX

import { MDXRemote } from 'next-mdx-remote';

import { serialize } from 'next-mdx-remote/serialize';

export async function getStaticProps() {

  const mdxSource = await serialize('# Hello MDX');

  return { props: { source: mdxSource } };

}

      

Fetching Blog Content

Real-time Preview

Revalidating CMS Content

export async function getStaticProps() {

  const posts = await fetchCMSPosts();

  return {

    props: { posts },

    revalidate: 10, // Revalidate every 10 seconds

  };

}

      

Best Practices with CMS

Creating Product Pages

export async function getStaticPaths() {

  const products = await fetchProducts();

  const paths = products.map(product => ({

    params: { id: product.id.toString() },

  }));

  return { paths, fallback: false };

}



export async function getStaticProps({ params }) {

  const product = await fetchProductById(params.id);

  return { props: { product } };

}

      

Cart State Management

import { createContext, useState, useContext } from 'react';

const CartContext = createContext();

export function CartProvider({ children }) {

  const [cart, setCart] = useState([]);

  const addToCart = (item) => setCart([...cart, item]);

  return <CartContext.Provider value={{ cart, addToCart }}>{children}</CartContext.Provider>;

}

export const useCart = () => useContext(CartContext);

      

Checkout Flow

Stripe Payment Integration

import { loadStripe } from '@stripe/stripe-js';

const stripePromise = loadStripe('your-publishable-key');

async function handleCheckout() {

  const stripe = await stripePromise;

  const { error } = await stripe.redirectToCheckout({

    sessionId: 'your-session-id',

  });

  if (error) console.error(error);

}

      

Inventory Management

Order API Routes

export default async function handler(req, res) {

  if (req.method === 'POST') {

    const orderData = req.body;

    // Save orderData to database

    res.status(200).json({ message: 'Order created' });

  } else {

    res.status(405).end();

  }

}

      

Product Filtering & Search

Admin Dashboard

Email Order Confirmations

Webhooks with Stripe

export default async function webhookHandler(req, res) {

  const event = req.body;

  switch(event.type) {

    case 'checkout.session.completed':

      // Fulfill order logic

      break;

    default:

      console.log(`Unhandled event type ${event.type}`);

  }

  res.status(200).json({ received: true });

}

      

What is a Monorepo?

Using Turborepo

npx create-turbo@latest

cd my-monorepo

npm install

npm run dev

      

Shared Component Libraries

Micro-frontend Basics

Nx in Next.js

Code Splitting in Monorepos

Environment Management

Isolated Builds

Module Federation

Deployment Strategies

Unit Testing with Jest

npm install --save-dev jest



// example.test.js

describe('sum function', () => {

  test('adds 1 + 2 to equal 3', () => {

    expect(1 + 2).toBe(3);

  });

});

      

React Testing Library

npm install --save-dev @testing-library/react



import { render, screen } from '@testing-library/react';

import Home from '../pages/index';



test('renders welcome message', () => {

  render(<Home />);

  expect(screen.getByText('Welcome')).toBeInTheDocument();

});

      

Writing Testable Components

Snapshot Testing

import renderer from 'react-test-renderer';

import Button from '../components/Button';



test('Button snapshot', () => {

  const tree = renderer.create(<Button label="Click me" />).toJSON();

  expect(tree).toMatchSnapshot();

});

      

Mocking API Calls

End-to-End Testing with Cypress

npm install cypress --save-dev



// In cypress/integration/sample_spec.js

describe('My First Test', () => {

  it('Visits the Next.js app', () => {

    cy.visit('http://localhost:3000');

    cy.contains('Welcome');

  });

});

      

Test Coverage Reports

CI Testing Setup

Storybook for Visual Testing

Test-Driven Development (TDD)

function greetUser(name) {

  return `Hello, ${name}! How can AI assist you today?`;

}

console.log(greetUser("Alice")); // > Hello, Alice! How can AI assist you today?

  

const aiUX = {

  transparency: "Explain AI decisions",

  control: "Allow user override",

  seamless: "Integrate AI naturally"

};

console.log(aiUX);

  

function chatbotReply(message) {

  if(message.toLowerCase().includes("hello")) {

    return "Hi there! How can I help you?";

  } else {

    return "Sorry, I didn't get that.";

  }

}

console.log(chatbotReply("Hello")); // > Hi there! How can I help you?

  

function listenVoiceCommand(command) {

  if(command === "play music") {

    return "Playing music...";

  } else {

    return "Command not recognized.";

  }

}

console.log(listenVoiceCommand("play music")); // > Playing music...

  

function summarize(text) {

  return text.split(".")[0] + ".";

}

console.log(summarize("AI helps make interfaces smarter. It saves time.")); // > AI helps make interfaces smarter.

  

function recommend(items, interest) {

  return items.filter(item => item.includes(interest));

}

console.log(recommend(["apple", "banana", "apricot"], "ap")); // > ["apple", "apricot"]

  

const userData = { email: "alice@example.com" };

function autofill(field) {

  return userData[field] || "";

}

console.log(autofill("email")); // > alice@example.com

  

const dictionary = { hello: "hola", goodbye: "adios" };

function translate(word) {

  return dictionary[word.toLowerCase()] || "unknown";

}

console.log(translate("Hello")); // > hola

  

function predict(prefix, dictionary) {

  return dictionary.filter(word => word.startsWith(prefix));

}

console.log(predict("ap", ["apple", "apricot", "banana"])); // > ["apple", "apricot"]

  

function sentiment(text) {

  const positiveWords = ["good", "happy", "great"];

  const negativeWords = ["bad", "sad", "terrible"];

  const words = text.toLowerCase().split(" ");

  let score = 0;

  words.forEach(word => {

    if(positiveWords.includes(word)) score++;

    if(negativeWords.includes(word)) score--;

  });

  return score > 0 ? "Positive" : score < 0 ? "Negative" : "Neutral";

}

console.log(sentiment("I feel good today")); // > Positive

  

<!-- Basic setup for OpenAI API using fetch -->

const apiKey = "YOUR_OPENAI_API_KEY";

async function callOpenAI(prompt) {

  const response = await fetch("https://api.openai.com/v1/completions", {

    method: "POST",

    headers: {

      "Content-Type": "application/json",

      "Authorization": `Bearer ${apiKey}`

    },

    body: JSON.stringify({

      model: "text-davinci-003",

      prompt: prompt,

      max_tokens: 50

    })

  });

  const data = await response.json();

  return data.choices[0].text;

}

callOpenAI("Hello AI!").then(console.log);

  

<!-- Example pseudocode for calling Gemini or Bard API -->

async function callGeminiAPI(query) {

  const response = await fetch("https://api.gemini.example.com/v1/query", {

    method: "POST",

    headers: { "Authorization": "Bearer YOUR_GEMINI_API_KEY" },

    body: JSON.stringify({ query: query })

  });

  const result = await response.json();

  return result.answer;

}

callGeminiAPI("Tell me about AI").then(console.log);

  

<!-- Call Hugging Face inference API for a transformer model -->

async function callHuggingFace(input) {

  const response = await fetch("https://api-inference.huggingface.co/models/distilbert-base-uncased", {

    method: "POST",

    headers: {

      "Authorization": "Bearer YOUR_HUGGINGFACE_API_TOKEN",

      "Content-Type": "application/json"

    },

    body: JSON.stringify({ inputs: input })

  });

  const data = await response.json();

  return data[0].label;

}

callHuggingFace("I love AI").then(console.log);

  

<!-- Example: Simple LangChain prompt call in Next.js API route -->

import { NextApiRequest, NextApiResponse } from 'next';

import { LLMChain } from 'langchain/chains';

import { OpenAI } from 'langchain/llms/openai';



export default async function handler(req: NextApiRequest, res: NextApiResponse) {

  const llm = new OpenAI();

  const chain = new LLMChain({ llm, prompt: "Say hello to AI" });

  const response = await chain.call({});

  res.status(200).json({ result: response.text });

}

  

<!-- Example Next.js API route calling OpenAI -->

export default async function handler(req, res) {

  const response = await fetch("https://api.openai.com/v1/completions", {

    method: "POST",

    headers: {

      "Content-Type": "application/json",

      "Authorization": `Bearer ${process.env.OPENAI_API_KEY}`

    },

    body: JSON.stringify({

      model: "text-davinci-003",

      prompt: req.body.prompt,

      max_tokens: 100

    })

  });

  const data = await response.json();

  res.status(200).json(data);

}

  

<!-- Example to handle streaming response from OpenAI -->

async function streamOpenAIResponse() {

  const response = await fetch("https://api.openai.com/v1/chat/completions", {

    method: "POST",

    headers: {

      "Content-Type": "application/json",

      "Authorization": `Bearer ${apiKey}`

    },

    body: JSON.stringify({

      model: "gpt-4",

      messages: [{ role: "user", content: "Stream this response" }],

      stream: true

    })

  });

  const reader = response.body.getReader();

  while(true) {

    const { done, value } = await reader.read();

    if(done) break;

    const chunk = new TextDecoder().decode(value);

    console.log(chunk);

  }

}

  

<!-- Basic try-catch for API call -->

async function safeCallAI() {

  try {

    const res = await fetch("https://api.openai.com/v1/completions", { method: "POST", headers: {

      "Content-Type": "application/json",

      "Authorization": `Bearer ${apiKey}` },

      body: JSON.stringify({ model: "text-davinci-003", prompt: "Hello", max_tokens: 5 })

    });

    const data = await res.json();

    return data.choices[0].text;

  } catch (error) {

    console.error("Error calling AI API:", error);

    return "Sorry, something went wrong.";

  }

}

  

<!-- Simple console logging for AI usage tracking -->

function logAIUsage(userId, prompt) {

  console.log(`User ${userId} sent prompt: ${prompt}`);

}

logAIUsage("user123", "Explain AI");

  

<!-- Basic rate limiting with a counter -->

const userCalls = {};

function canCallAPI(userId) {

  if(!userCalls[userId]) userCalls[userId] = 0;

  if(userCalls[userId] >= 5) return false;

  userCalls[userId]++;

  return true;

}

console.log(canCallAPI("user123")); // > true

console.log(canCallAPI("user123")); // > true

  

<!-- Use environment variables and never expose keys in frontend code -->

/* .env.local file */

NEXT_PUBLIC_API_KEY= # <-- Don't expose keys here

OPENAI_API_KEY=your-secret-key



/* Access in Next.js backend code */

const apiKey = process.env.OPENAI_API_KEY;

  

Middleware for AI Routing

<!-- Simple Express middleware to route AI requests -->

function aiRoutingMiddleware(req, res, next) {

  if(req.path.startsWith('/api/ai')) {

    console.log('AI request routed:', req.path);

    // Custom AI logic or validation here

  }

  next();

}

app.use(aiRoutingMiddleware);

      

Caching AI Responses

<!-- Simple in-memory cache example for AI responses -->

const aiCache = {};

async function getAIResponse(prompt) {

  if(aiCache[prompt]) {

    return aiCache[prompt];  // Return cached response

  }

  const response = await callAI(prompt);

  aiCache[prompt] = response;

  return response;

}

      

AI Rate Policies

<!-- Rate limit middleware for AI calls -->

const rateLimits = {};

function rateLimitMiddleware(req, res, next) {

  const user = req.user.id;

  rateLimits[user] = (rateLimits[user] || 0) + 1;

  if(rateLimits[user] > 100) {

    return res.status(429).send('Rate limit exceeded');

  }

  next();

}

app.use('/api/ai', rateLimitMiddleware);

      

Edge AI Middleware

<!-- Example of edge middleware in Next.js to add AI headers -->

export function middleware(req) {

  const url = req.nextUrl.clone();

  if(url.pathname.startsWith('/api/ai')) {

    return new Response('Edge AI Middleware Applied', {

      headers: { 'X-AI-Edge': 'true' }

    });

  }

  return NextResponse.next();

}

      

User Role AI Access

<!-- Middleware checking user roles before AI access -->

function roleCheckMiddleware(req, res, next) {

  const userRole = req.user.role;

  if(userRole !== 'admin' && userRole !== 'ai_user') {

    return res.status(403).send('Access denied to AI');

  }

  next();

}

app.use('/api/ai', roleCheckMiddleware);

      

Tokenization and Privacy

<!-- Simple token masking function for privacy -->

function maskToken(token) {

  return token.slice(0,4) + '****' + token.slice(-4);

}

const token = "123456789abcdef";

console.log(maskToken(token)); // Outputs: 1234****cdef

      

Using Redis for AI Cache

<!-- Example using Redis for caching AI responses -->

import redis from 'redis';

const client = redis.createClient();



async function getCachedAIResponse(prompt) {

  return new Promise((resolve, reject) => {

    client.get(prompt, async (err, reply) => {

      if(reply) {

        resolve(reply);

      } else {

        const response = await callAI(prompt);

        client.set(prompt, response);

        resolve(response);

      }

    });

  });

}

      

AI Activity Monitoring

<!-- Simple logging for AI usage monitoring -->

function monitorAIActivity(userId, action) {

  console.log(`[AI Monitor] User: ${userId}, Action: ${action}, Time: ${new Date().toISOString()}`);

}

monitorAIActivity('user123', 'called AI model');

      

AI Logging with Sentry

<!-- Basic Sentry logging setup for AI errors -->

import * as Sentry from '@sentry/node';

Sentry.init({ dsn: 'YOUR_SENTRY_DSN' });



try {

  // call AI API

} catch(error) {

  Sentry.captureException(error);

}

      

Personalization Middleware

<!-- Middleware to attach user preferences for AI personalization -->

function personalizationMiddleware(req, res, next) {

  req.userPreferences = { theme: 'dark', language: 'en' };

  next();

}

app.use(personalizationMiddleware);

      

AI Blog Generator

<!-- Example Next.js API route calling AI to generate blog content -->

export default async function handler(req, res) {

  const prompt = req.body.prompt;

  const blogContent = await callAItoGenerateBlog(prompt);

  res.status(200).json({ content: blogContent });

}



async function callAItoGenerateBlog(prompt) {

  // Simulated AI response for demo

  return `Blog post about: ${prompt}`;

}

      

AI Product Description Generator

<!-- Simple function to generate product description using AI -->

async function generateProductDescription(productName) {

  return `This is a great product called ${productName} that solves many problems.`;

}



generateProductDescription('Smart Watch').then(console.log);

      

Resume Builder with AI

<!-- AI-powered resume builder function -->

async function buildResume(data) {

  return `Resume for ${data.name}: Experienced in ${data.skills.join(', ')}.`;

}



buildResume({ name: 'Alice', skills: ['JavaScript', 'React'] }).then(console.log);

      

AI Tutor App

<!-- Simple AI tutor answer generator -->

async function tutorAnswer(question) {

  return `Answer to your question "${question}" is: ... (AI generated).`;

}



tutorAnswer('What is Next.js?').then(console.log);

      

Recipe Generator App

<!-- Generate recipe based on ingredients -->

async function generateRecipe(ingredients) {

  return `Recipe using ${ingredients.join(', ')}: ... (AI generated).`;

}



generateRecipe(['tomato', 'basil']).then(console.log);

      

AI Comic Dialogue Generator

<!-- Generate comic dialogue for characters -->

async function generateDialogue(characters) {

  return `${characters[0]} says hello to ${characters[1]}.`;

}



generateDialogue(['Hero', 'Sidekick']).then(console.log);

      

Image Description Generator

<!-- Function to generate image descriptions -->

async function describeImage(imageUrl) {

  return `Description for image at ${imageUrl}: A beautiful scene.`;

}



describeImage('http://example.com/image.jpg').then(console.log);

      

Real-time Voice Translator

<!-- Mock function to translate spoken text in real-time -->

async function translateVoice(text, targetLang) {

  return `Translated "${text}" to ${targetLang}.`;

}



translateVoice('Hello', 'es').then(console.log);

      

AI-powered Search Bar

<!-- Simple AI-enhanced search function -->

async function aiSearch(query) {

  return `Search results for "${query}" (AI enhanced).`;

}



aiSearch('Next.js tutorials').then(console.log);

      

AI + Next.js + Vercel Deployment

<!-- Basic deployment config example -->

module.exports = {

  target: 'serverless',

  // Vercel handles Next.js API routes

};



<!-- Deployment is done via Vercel CLI or Git integration -->