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Express.js res.send() Function
  • Last Updated : 07 Jul, 2020
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The res.send() function basically sends the HTTP response. The body parameter can be a String or a Buffer object or an object or an Array.

Syntax:

res.send( [body] )

Parameter: This function accepts a single parameter body that describe the body which is to be sent in the response.

Returns: It retuns an Object.

Installation of express module:



  1. You can visit the link to Install express module. You can install this package by using this command.
    npm install express
  2. After installing the express module, you can check your express version in command prompt using the command.
    npm version express
  3. After that, you can just create a folder and add a file for example, index.js. To run this file you need to run the following command.
    node index.js

Example 1: Filename: index.js




var express = require('express');
var app = express();
var PORT = 3000;
  
// Without middleware
app.get('/', function(req, res){
    res.send({ title: 'GeeksforGeeks' });
});
  
app.listen(PORT, function(err){
    if (err) console.log(err);
    console.log("Server listening on PORT", PORT);
});

Steps to run the program:

  1. The project structure will look like this:
  2. Make sure you have installed express module using the following command:
    npm install express
  3. Run index.js file using below command:
    node index.js

    Output:

    Server listening on PORT 3000
  4. Now open browser and go to http://localhost:3000/, now check your browser and you will see the following output:
    {"title":"GeeksforGeeks"}

Example 2: Filename: index.js




var express = require('express');
const path = require('path');
var app = express();
var PORT = 3000;
  
// With middleware
app.use('/', function(req, res, next){
   res.send({"name":"GeeksforGeeks"});
   next();
});
  
app.get('/', function(req, res){
    console.log("Body Sent")
});
  
app.listen(PORT, function(err){
    if (err) console.log(err);
    console.log("Server listening on PORT", PORT);
});

Run index.js file using below command:

node index.js

Now open the browser and go to http://localhost:3000/, now check your console and you will see the following output:

Server listening on PORT 3000
Body Sent

And you will see the following output on your browser screen:

{"name":"GeeksforGeeks"}

Reference: https://expressjs.com/en/5x/api.html#res.send

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