ExpressJS - HTTP Methods

Quiz

The HTTP method is supplied in the request and specifies the operation that the client has requested. The following table lists the most used HTTP methods −

S.No.	Method & Description
1	GET The GET method requests a representation of the specified resource. Requests using GET should only retrieve data and should have no other effect.
2	POST The POST method requests that the server accept the data enclosed in the request as a new object/entity of the resource identified by the URI.
3	PUT The PUT method requests that the server accept the data enclosed in the request as a modification to existing object identified by the URI. If it does not exist then the PUT method should create one.
4	DELETE The DELETE method requests that the server delete the specified resource.

These are the most common HTTP methods. To learn more about the methods, visit http://www.tutorialspoint.com/http/http_methods.htm.

Example

Create a new file called index.js in hello-world directory and type the following in it.

index.js

var express = require('express');
var app = express();

app.get('/', function(req, res){
   res.send("GET Request!");
});

app.post('/', function(req, res){
   res.send("POST Request!");
});

app.put('/', function(req, res){
   res.send("PUT Request!");
});

app.delete('/', function(req, res){
   res.send("DELETE Request!");
});

app.listen(3000);

Save the file, go to your terminal and type the following.

E:\Dev\hello-world>nodemon index.js
[nodemon] 3.1.9
[nodemon] to restart at any time, enter `rs`
[nodemon] watching path(s): *.*
[nodemon] watching extensions: js,mjs,cjs,json
[nodemon] starting `node index.js`

This will start the server. To test this app, open your browser and go to http://localhost:3000 and a message will be displayed as in the following screenshot.

To test other requests, open postman. Now hit the below URL's in POSTMAN application and you can see the output−

POST Request http://localhost:3000/

Similary you can test the other urls.

PUT Request http://localhost:3000/

DELETE Request http://localhost:3000/

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