Node.js
How to Build Your First REST API with Node.js and Express
Build a small, well-structured REST API with Express and understand each moving part.
byte team··9 min read·Updated Jan 9, 2026
An API exposes data and actions through predictable HTTP endpoints. Express provides a small routing layer on top of Node.js.
Create a route
Start with a GET route that returns JSON. Keep route handlers focused, then move larger business rules into separate modules.
Return useful status codes
Use 200 for success, 201 for creation, 400 for invalid input, and 404 when a resource does not exist.