Stop 05 · Express.js & Web FrameworksTopics · 6/14
Route Parameters
Part of the Backend Developer Roadmap
In short
Dynamic segments in a URL path (`/users/:id`) captured into `req.params` — how you identify a specific resource in a RESTful API.
How to learn this
- 1Build a route with multiple params, e.g. `/users/:userId/posts/:postId`.
- 2Validate that a param is the expected type/format before using it in a DB query.
- 3Learn optional params and simple pattern matching in Express routes.
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