Node.js: Express: Routing

Routing maps the url to specific handler based on the the URL and the http request type (GET, PUT, POST, DELETE etc.,).

Below statements map to home page.

app.get('/', (req, res) => res.send('Welcome to Node.js Programming'));

Whenever user request for /greetMe and get request, it is mapped to below function.

app.get("/greetMe", (req, res) => {

         console.log("Serving actual response");

         res.send("Hello User, Have a great day!!!!")

} );

Find the below working example.

HelloWorld.js

//Load express module
const express = require('express');

//Put new Express application inside app variable
const app = express();
app.count = 1;

const port = 8080;

//When user hits the home page, then the message prints in browser.
app.get('/', (req, res) => res.send('Welcome to Node.js Programming'));

app.get("/greetMe", (req, res) => {
 res.send("Hello User, Have a great day!!!!");
} );

app.get("/hello", (req, res) => {
 res.send("Hello!!!!!!!!!!!!");
} );

// Start the express application on port 8080 and print server start message to console.
app.listen(port, () => console.log(`Application started listening on port ${port}!`));

Start HelloWorld.js application by executing below statement.

node HelloWorld.js

You can see below message in the console.

Application started listening on port 8080!

Hit the url 'http://localhost:8080/' in browser.

Hit the url 'http://localhost:8080/greetMe'.

Hit the url 'http://localhost:8080/hello'

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