Express JS App Method in Method

app.METHOD() is used for mapping or routing an HTTP request where METHOD represents the HTTP method of the request such as GET, POST, PUT, etc., but in lowercase. Therefore, the methods are app.get(), app.post(), app.get(), and so on.

Syntax

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

Parameters

• path − This is the path for which the middleware function is invoked. A path can be a string, path pattern, a regular expression or an array of all these.

• callback − These are the middleware functions or a series of middleware functions that acts like a middleware except that these callbacks can invoke next (route).

Example 1

Create a file "appMethod.js" and copy the following code snippet. After creating the file, use the command "node appMethod.js" to run this code.

// app.METHOD() Method Demo Example

// Importing the express module
const express = require('express');

// Initializing the express and port number
var app = express();

// Initializing the router from express
var router = express.Router();
var PORT = 3000;

// This api will handle the GET request
app.get('/api', function(req, res){
   res.send("GET method called");
});

// This api will handle the POST request
app.post('/api', function(req, res){
   res.send("POST method called");
});

// This api will handle the PUT request
app.put('/api', function(req, res){
   res.send("PUT method called");
});

app.listen(PORT, function(err){
   if (err) console.log(err);
   console.log("Server listening on PORT", PORT);
});

Hit the following Endpoint to get the response

• GET – http://localhost:3000/api

Output

C:\home
ode>> node appMethod.js
Server listening on PORT 3000

On the browser, you will get to see the following output