Routing refers to determining how an application responds to a client request to a particular endpoint, which is a URI (or path) and a specific HTTP request method (GET, POST, and so on).
Below is an example of a simple “Hello World” route in ExpressJS:
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const express = require('express') const app = express() app.get('/', (req, res) => { res.send('Hello World!') }) app.listen(3000, () => { console.log('Demo app listening on port 3000!') }) |
In this example, the app.get() method is used to define a GET request route that matches the root URL path (/). When a GET request is received at this URL, the callback function passed to app.get() is executed, which sends a response to the client with the message "Hello World!". The app.listen() method is used to start the ExpressJS application and listen on port 3000.
You can test this route by running the above code and navigating to http://localhost:3000 in your web browser. You should see the message "Hello World!" displayed in the browser.