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Body-parser middleware in Node.js

  • Difficulty Level : Hard
  • Last Updated : 25 Jun, 2021

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: 
 

  1. You can visit the link to Install body-parser module. You can install this package by using this command. 
     
npm install body-parser
  1. After installing body-parser you can check your body-parser version in command prompt using the command. 
     
npm --version body-parser
  1. 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

Filename: 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>

Filename: index.js 
 

javascript






const bodyparser = require('body-parser')
const express = require("express")
const path = require('path')
const app = express()
  
var 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:false}))
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: 
 

  1. The project structure will look like this: 
     

project structure

  1. Make sure you have installed ‘view engine’ like I have used “ejs” and also installed express and body-parser module using following commands: 
     
npm install express
npm install ejs
npm install body-parser
  1. Run index.js file using below command: 
     
node index.js
  1. Now Open browser and type the below URL and you will see the Demo Form as shown below: 
     
http://localhost:3000/
  1.  

Demo Form

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

output

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

error

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




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