ExpressRouter

ExpressRouter is a library for Node.js designed to enhance routing in Express.js applications. It provides a dedicated Router class that allows developers to compose routes into modular, reusable sub-routers, which can be mounted on path prefixes within a larger application.

Core concepts include hierarchical routers, route-level middleware, and explicit composition of middleware stacks. ExpressRouter exposes a router instance with methods for HTTP verbs (get, post, put, delete, etc.) as well as a use method to mount sub-routers. Routers can be nested to reflect domain boundaries or feature modules, enabling better organization and testability.

Usage involves creating a router, defining routes on it, and then mounting it into an Express app. For example: const ExpressRouter = require('expressrouter'); const router = new ExpressRouter(); router.get('/users', listUsers); router.post('/users', createUser); const app = require('express')(); app.use('/api', router);

Design goals include compatibility with Express middleware and error handling patterns, minimal overhead, and predictable routing behavior. It is intended to complement rather than replace Express's built-in router, and it can work with existing Express middleware and error handlers.

See also: Express.js, Node.js, HTTP routing. External references would include the project's documentation or repository.