Routing Middleware API

export const config = {
  matcher: '/about/:path*',
};

export const config = {
  matcher: ['/about/:path*', '/dashboard/:path*'],
};

export const config = {
  matcher: ['/((?!api|_next/static|favicon.ico).*)'],
};

export const config = {
  matcher: ['/blog/:slug(\\d{1,})'],
};

import { rewrite } from '@vercel/functions';
 
export default function middleware(request: Request) {
  const url = new URL(request.url);
 
  if (url.pathname.startsWith('/about')) {
    return rewrite(new URL('/about-2', request.url));
  }
 
  if (url.pathname.startsWith('/dashboard')) {
    return rewrite(new URL('/dashboard/user', request.url));
  }
}

export const config = {
  runtime: 'nodejs', // defaults to 'edge'
};

// config with custom matcher
export const config = {
  matcher: '/about/:path*',
};
 
export default function middleware(request: Request) {
  return Response.redirect(new URL('/about-2', request.url));
}

import type { NextFetchEvent } from 'next/server';
 
export const config = {
  matcher: '/',
};
 
const wait = (ms: number) => new Promise((resolve) => setTimeout(resolve, ms));
 
async function getProduct() {
  const res = await fetch('https://api.vercel.app/products/1');
  await wait(10000);
  return res.json();
}
 
export default function middleware(request: Request, context: NextFetchEvent) {
  context.waitUntil(getProduct().then((json) => console.log({ json })));
 
  return new Response(JSON.stringify({ hello: 'world' }), {
    status: 200,
    headers: { 'content-type': 'application/json' },
  });
}

import { NextResponse } from 'next/server';
import type { NextRequest } from 'next/server';
 
// The country to block from accessing the secret page
const BLOCKED_COUNTRY = 'SE';
 
// Trigger this middleware to run on the `/secret-page` route
export const config = {
  matcher: '/secret-page',
};
 
export default function middleware(request: NextRequest) {
  // Extract country. Default to US if not found.
  const country = (request.geo && request.geo.country) || 'US';
 
  console.log(`Visitor from ${country}`);
 
  // Specify the correct route based on the requests location
  if (country === BLOCKED_COUNTRY) {
    request.nextUrl.pathname = '/login';
  } else {
    request.nextUrl.pathname = `/secret-page`;
  }
 
  // Rewrite to URL
  return NextResponse.rewrite(request.nextUrl);
}

import { ipAddress } from '@vercel/functions';
import { next } from '@vercel/functions';
 
export default function middleware(request: Request) {
  const ip = ipAddress(request);
  return next({
    headers: { 'x-your-ip-address': ip || 'unknown' },
  });
}

import type { RequestContext } from '@vercel/functions';
 
export default function handler(request: Request, context: RequestContext) {
  context.waitUntil(getAlbum().then((json) => console.log({ json })));
 
  return new Response(
    `Hello there, from ${request.url} I'm an Vercel Function!`,
  );
}
 
export const config = {
  matcher: '/',
};
 
const wait = (ms: number) => new Promise((resolve) => setTimeout(resolve, ms));
 
async function getAlbum() {
  const res = await fetch('https://jsonplaceholder.typicode.com/albums/1');
  await wait(10000);
  return res.json();
}

import { NextResponse } from 'next/server';
import type { NextRequest } from 'next/server';
// Trigger this middleware to run on the `/about` route
export const config = {
  matcher: '/about',
};
 
export default function middleware(request: NextRequest) {
  // Rewrite to URL
  return NextResponse.rewrite('/about-2');
}

import { NextResponse } from 'next/server';
import type { NextRequest } from 'next/server';
 
export function middleware(request: NextRequest) {
  // Clone the request headers and set a new header `x-hello-from-middleware1`
  const requestHeaders = new Headers(request.headers);
  requestHeaders.set('x-hello-from-middleware1', 'hello');
 
  // You can also set request headers in NextResponse.next
  const response = NextResponse.next({
    request: {
      // New request headers
      headers: requestHeaders,
    },
  });
 
  // Set a new response header `x-hello-from-middleware2`
  response.headers.set('x-hello-from-middleware2', 'hello');
  return response;
}

import { NextResponse } from 'next/server';
export default function middleware() {
  return NextResponse.next();
}