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:
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>
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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
app.set("views", path.join(__dirname))
app.set("view engine", "ejs")
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)
})
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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/
Now submit the form and then you will see the following output:
But if we do not use this body-parser middle, then while parsing, an error will occur as shown below:
So this is how you can use the body-parser module for parsing incoming request bodies in middleware before you handle it.