middleware-patterns

To design a middleware pipeline in Node.js, you chain composable functions where each processes the request and calls next(). This pattern handles authentication, logging, and CORS by passing control sequentially through the request lifecycle before reaching the route handler.

Global middleware runs on every incoming request, route middleware targets specific endpoints, and group middleware applies to a collection of routes. These types dictate the scope of request processing for tasks like authorization and security headers across server and edge runtimes.

Yes, the middleware pattern works with edge runtimes like Cloudflare Workers. The skill provides framework-agnostic guidance for designing request pipelines and covers specific integration examples for edge environments alongside Node.js and H3/Nitro frameworks.

The best way to handle errors in a composable middleware chain is to use decorator or pipeline patterns that wrap the next() call. This allows centralized error catching within the request processing flow, ensuring consistent error responses across server and edge contexts.

Yes, you can use middleware patterns for rate limiting and CORS configuration. They are common use cases for request processing pipelines, allowing you to intercept incoming requests, apply security rules, and attach headers before the primary route handler executes.