Express.js res.send() Function – GeeksforGeeks

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 describes the body which is to be sent in the response.

Returns: It returns an Object.

Installation of the express module:  

You can visit the link to Install the express module. You can install this package by using this command. 

npm install express

After installing the express module, you can check your express version in the command prompt using the command. 

npm version express

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

Project Structure:

Example 1: Filename: index.js 

Javascript

const express = require('express');

const app = express();

const PORT = 3000;

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: 

Make sure you have installed the express module using the following command: 

npm install express

Run the index.js file using the below command: 

node index.js

Output: 

Console Output:

Server listening on PORT 3000

Browser Output:

Now open the 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 

Javascript

const express = require('express');

const path = require('path');

const app = express();

const PORT = 3000;

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);

});

Steps to run the program: 

Run the index.js file using the below command: 

node index.js

Output:

Console Output:

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

Browser Output:

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

{"name":"GeeksforGeeks"}

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

My Personal Notes

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