Node.js Express Routing

Route parameters, query strings and request bodies.

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Methods: app.get, post, put, patch, delete
Route parameters: /users/:id → req.params.id
Query strings: /search?q=node → req.query.q
JSON bodies: add app.use(express.json()), then read req.body
express.Router() groups related routes into modules.

Key Takeaways: Node.js Express Routing

Mastering Node.js Express Routing helps you write clean and reliable Node.js code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.

Node.js Express Routing Code Example

Node.js

import express from "express";
const app = express();
app.use(express.json());

app.get("/users/:id", (req, res) => {
  res.json({ id: Number(req.params.id), name: "User " + req.params.id });
});

app.get("/search", (req, res) => {
  res.send(`You searched for: ${req.query.q}`);
});

app.post("/users", (req, res) => {
  const { name, email } = req.body;
  res.status(201).json({ id: 11, name, email });
});

app.listen(3000);
// GET /users/7         → {"id":7,"name":"User 7"}
// GET /search?q=node   → You searched for: node

Output

GET /users/7 → {"id":7,"name":"User 7"}
GET /search?q=node → You searched for: node
POST /users → 201 {"id":11,"name":"Sara","email":"sara@example.com"}

Run this example on your own computer. The "Get Started" lesson shows how to set it up.