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Showing content from https://vercel.com/docs/routing-middleware/getting-started below:

Getting Started with Routing Middleware

Routing Middleware lets you to run code before your pages load, giving you control over incoming requests. It runs close to your users for fast response times and are perfect for redirects, authentication, and request modification.

Routing Middleware is available on the Node.js, and Edge runtimes. Node.js is the default runtime for Routing Middleware, to configure runtimes, see the runtimes documentation.

• Create your first Routing Middleware
• Redirect users based on URLs
• Add conditional logic to handle different scenarios
• Configure which paths your Routing Middleware runs on

• A Vercel project
• Basic knowledge of JavaScript/TypeScript

The following steps will guide you through creating your first Routing Middleware.

1. Create a file called middleware.ts in your project root (same level as your package.json) and add the following code:

   export const config = {
     runtime: 'nodejs', // defaults to 'edge'
   };
    
   export default function middleware(request: Request) {
     console.log('Request to:', request.url);
     return new Response('Logging request URL from Middleware');
   }

   • Every request to your site will trigger this function
   • You log the request URL to see what's being accessed
   • You return a response to prove the middleware is running

   Deploy your project and visit any page. You should see "Logging request URL from Middleware" instead of your normal page content.

2. To redirect users based on their URL, add a new route to your project called /blog, and modify your middleware.ts to include a redirect condition.

   export const config = {
     runtime: 'nodejs', // defaults to 'edge'
   };
    
   export default function middleware(request: Request) {
     const url = new URL(request.url);
    
     // Redirect old blog path to new one
     if (url.pathname === '/old-blog') {
       return new Response(null, {
         status: 302,
         headers: { Location: '/blog' },
       });
     }
    
     // Let other requests continue normally
     return new Response('Other pages work normally');
   }

   • You use new URL(request.url) to parse the incoming URL
   • You check if the path matches /old-blog
   • If it does, you return a redirect response (status 302)
   • The Location header tells the browser where to go

   Try visiting /old-blog - you should be redirected to /blog.

3. By default, Routing Middleware runs on every request. To limit it to specific paths, you can use the config object:

   export const config = {
     runtime: 'nodejs', // defaults to 'edge'
   };
    
   export default function middleware(request: Request) {
     const url = new URL(request.url);
    
     // Only handle specific redirects
     if (url.pathname === '/old-blog') {
       return new Response(null, {
         status: 302,
         headers: { Location: '/blog' },
       });
     }
    
     return new Response('Middleware processed this request');
   }
    
   // Configure which paths trigger the Middleware
   export const config = {
     matcher: [
       // Run on all paths except static files
       '/((?!_next/static|_next/image|favicon.ico).*)',
       // Or be more specific:
       // '/blog/:path*',
       // '/api/:path*'
     ],
   };

   • The matcher array defines which paths trigger your Routing Middleware
   • The regex excludes static files (images, CSS, etc.) for better performance
   • You can also use simple patterns like /blog/:path* for specific sections

   See the API Reference for more details on the config object and matcher patterns.

4. When things don't work as expected:

   1. Check the logs: Use console.log() liberally and check your Vercel dashboard Logs tab
   2. Test the matcher: Make sure your paths are actually triggering the Routing Middleware
   3. Verify headers: Log request.headers to see what's available
   4. Test locally: Routing Middleware works in development too so you can debug before deploying

   export const config = {
     runtime: 'nodejs', // defaults to 'edge'
   };
    
   export default function middleware(request: Request) {
     // Debug logging
     console.log('URL:', request.url);
     console.log('Method:', request.method);
     console.log('Headers:', Object.fromEntries(request.headers.entries()));
    
     // Your functions logic here...
   }

Learn more about Routing Middleware by exploring the following resources:

RetroSearch is an open source project built by @garambo | Open a GitHub Issue

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