Learn Express Router

install express dependency with npm :

npm instal express --save

or using yarn :

yarn add express

Routing

Routing is basically matches the functions you wrote with the requests that server gets.

This project structure will be like this :

.
+-- routes
|   +- users.js
+-- app.js
+-- package.json
+-- yarn.lock
+-- README.md

routes folder is placed by route file, for example is users / category / or anything. that folder is handle route whatever the http method.

HTTP VERB / METHOD

app.get('/', (req, res) => { /* */ })
app.post('/', (req, res) => { /* */ })
app.put('/', (req, res) => { /* */ })
app.delete('/', (req, res) => { /* */ })
app.patch('/', (req, res) => { /* */ })

Those methods accept a callback function, which is called when a request is started, and we need to handle it.

(req, res) => res.send("Hello World")

Express sends us two objects in this callback, which we called req and res , that represent the Request and the Response objects.

Routing have many different way to make a route

const express = require("express");
const router = express.Router();

Declare and initialize express router

How to route ? Here is some code :

router.get("/hello", (req, res) => {
  res.status(200).send({
    msg: "HALLO DUNIA"
  });
});

and the bottom of the route file :

module.exports = router;

and the last part is use in app.js or server.js

app.use("/api/v1", require("./routes/users"));