#Middleware

If you have ever opened the raw node:http module and tried to write a real server with it, you...

If you've worked with Express.js for more than a week, you know the feeling: you ask Claude to add a...

Deciding what counts as a successful response in a `handle_response/1` after `Tesla.get`, instead of inside the Tesla middleware chain, makes 5xx and malformed payloads look like successful requests to your telemetry.

Execute custom logic at the moment of request, pushing personalization to the edge with exceptional performance.

AI SDK 3.4 introduces middleware, data stream protocol, and multi-step generations

Next.js 15.2 introduces experimental Node.js Middleware, now available at Vercel—giving you full Node.js runtime support for your Middleware. Run authentication, logging, request handling, and more with familiar Node.js APIs.

A security vulnerability in Next.js was responsibly disclosed, which allows malicious actors to bypass authorization in Middleware when targetting the x-middleware-subrequest header.

Last week, we published CVE-2025-29927 and patched a critical severity vulnerability in Next.js. Here’s our post-incident analysis and next steps.

In the process of remediating CVE-2025-29927, we looked at other possible exploits of Middleware. We independently verified this low severity vulnerability at the same time as two further reports from independent researchers.

The Vercel Observability dashboard now includes a dedicated view for middleware, showing invocation counts and performance metrics.

The Edge runtime now runs on Vercel Functions, unifying pricing across all compute, and available before and after cache. Edge Middleware and Edge Functions are now deprecated.

A vulnerability affecting Next.js Middleware has been addressed. It impacted versions prior to v14.2.32 and v15.4.7.

If you've built any web application in Go, you've probably heard about middlewares. But what exactly...

Introduction If you have been building anything non-trivial with Genkit, you have probably...

What is Middleware in Express and How It Works Every Express beginner eventually reaches...

Hello readers 👋, welcome to the 10th blog in our Node.js series! In the last post, we built a clean...

The checkpoint system between request and response — where logging, authentication, and validation...

Vue is great. Vite is great. Vue Router is great. But there's one area where the "bring your own...

If you've spent any time with Node.js, you've probably heard the word middleware thrown around like...