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Frameworks & web · #express
Passport's serializeUser and deserializeUser bridge the gap between login and subsequent requests. Here is how they work, a minimal example, and the trade-offs.
Express 4 silently drops rejected promises from async handlers, hanging requests. A two-line wrapper or Express 5's automatic forwarding centralizes failures into one error middleware.
When Express sits behind Nginx or a CDN, req.ip is wrong by default. Learn how trust proxy works, configure trusted hops safely, and verify client-IP behavior without exposing your app to header spoofing.
Learn how to implement a request boundary in Express.js using a middleware chain to decouple authentication and validation from business logic, preventing leaky abstractions.
How to modularize an Express app with express.Router(): a worked mounted-router example, how routing context and middleware order actually work, and the mistakes that cause 404s and hanging requests.
When Express routes scatter across a main file, Router encapsulates them into modular units. This blog explains the feature, a concrete mounting example, and practical trade-offs.
Stop cluttering your Express routes with repetitive try-catch blocks. Learn how to implement a centralized error-handling middleware for consistent API responses.
A fresh Express server ships with almost no security headers. KrakenJS's Helmet middleware fixes that with one line — here's what it sets, how to tune the CSP per route, and where it falls short.
express.Router lets you split a monolithic app.js into mountable feature modules with scoped middleware. Here's how mounting, nesting, and the mergeParams option actually work — and where the pipeline gets confusing.
nodejs
javascript