router.METHOD() Function

router.METHOD() defines a route on a Router instance for one specific HTTP method — get, post, put, delete, and so on.

Syntax

router.METHOD(path, callback [, callback ...])

Example

const express = require("express");
const app = express();
const router = express.Router();
const PORT = 5000;

router.get("/items", (req, res) => {
    res.send("List of items");
});

router.post("/items", (req, res) => {
    res.send("Item added");
});

router.delete("/items/:id", (req, res) => {
    res.send(`Item ${req.params.id} removed`);
});

app.use(router);

app.listen(PORT, () => console.log(`Listening on ${PORT}`));

Use cases

Defining routes scoped to a specific HTTP method.
Organizing routes with express.Router() instead of directly on app.
Building modular, mountable route files for RESTful APIs.