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Express.js req.body Property

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  • Difficulty Level : Medium
  • Last Updated : 17 Mar, 2023
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The req.body property contains key-value pairs of data submitted in the request body. By default, it is undefined and is populated when you use a middleware called body-parsing such as express.urlencoded() or express.json(). 

Syntax:

req.body

Parameter: No parameters. 

Return Value: 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;
 
// For parsing application/json
app.use(express.json());
 
// For parsing application/x-www-form-urlencoded
app.use(express.urlencoded({ extended: true }));
 
app.post('/profile', function (req, res) {
    console.log(req.body);
    res.send();
});
 
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

Now make a POST request to http://localhost:3000/profile with the following body:

{
    "title":"Greetings from GeeksforGeeks"
}

Browser Output:

Now you can see the following output on your console:

Server listening on PORT 3000
{ title: 'Greetings from GeeksforGeeks' }

Example 2: Filename: index.js 

javascript




const express = require('express');
const app = express();
const PORT = 3000;
 
app.use(express.json());
app.use(express.urlencoded({ extended: true }));
 
app.post('/signup', function (req, res) {
    const data = req.body;
 
    console.log("Name: ", data.name);
    console.log("Age: ", data.age);
    console.log("Gender: ", data.gender);
 
    res.send();
});
 
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

Now make a POST request to http://localhost:3000/signup with the following request body:

 {
     "name": "Gourav",
     "age": 13,
     "gender":"Male"
 }

Output: Now you will see the following output on your console screen:

Server listening on PORT 3000
Name:  Gourav
Age:  13
Gender:  Male

Reference: https://expressjs.com/en/4x/api.html#req.body


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