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Body-parser middleware in Node.js

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Body-parser is the Node.js body-parsing middleware. It is responsible for parsing the incoming request bodies in a middleware before you handle it. 

Installation of body-parser module:

You can visit the link to Install the body-parser module. You can install this package by using this command.

npm install body-parser

After installing body-parser you can check your body-parser version in the command prompt using the command.

npm version body-parser

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:

project structure

Filename: 

SampleForm.ejs: The below code should be in the SampleForm.ejs

html

<!DOCTYPE html>
<html>
<head>
    <title>Body-Parser Module Demo</title>
</head>
 
<body>
    <h1>Demo Form</h1>
 
    <form action="saveData" method="POST">
        <pre>
            Enter your Email : <input type="text"
                                      name="email"> <br>
                                 
            <input type="submit" value="Submit Form">
        </pre>
    </form>
</body>
</html>

                    

index.js 

javascript

const bodyparser = require('body-parser')
const express = require("express")
const path = require('path')
const app = express()
 
let PORT = process.env.port || 3000
 
// View Engine Setup
app.set("views", path.join(__dirname))
app.set("view engine", "ejs")
 
// Body-parser middleware
app.use(bodyparser.urlencoded({ extended: true }))
app.use(bodyparser.json())
 
app.get("/", function (req, res) {
    res.render("SampleForm")
});
 
app.post('/saveData', (req, res) => {
    console.log("Using Body-parser: ", req.body.email)
})
 
app.listen(PORT, function (error) {
    if (error) throw error
    console.log("Server created Successfully on PORT", PORT)
})

                    

Steps to run the program:

Make sure you have installed ‘view engine’ like I have used “ejs” and also installed express and body-parser module using the following commands:

npm install express
npm install ejs
npm install body-parser

Run the index.js file using the below command:

node index.js

Now Open the browser and type the below URL and you will see the Demo Form as shown below:

http://localhost:3000/

Demo Form

Now submit the form and then you will see the following output: 

output

But if we do not use this body-parser middle, then while parsing, an error will occur as shown below: 

error

So this is how you can use the body-parser module for parsing incoming request bodies in middleware before you handle it.



Last Updated : 03 Apr, 2023
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