Express.js express.raw() Function

The express.raw() function is a built-in middleware function in Express. It parses incoming request payloads into a Buffer and is based on body-parser.

Syntax:

express.raw( [options] )

Parameter: The options parameter contains various property like inflate, limit, type, etc.

Return Value: It returns an Object.

Installation of express module:

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

   npm install express

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

   npm version express

3. 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

Example 1: Filename: index.js

var express = require('express');
var app = express();
var PORT = 3000;

app.use(express.raw());

app.post('/', function (req, res) {
    console.log(req.body);
    res.end();
})

app.listen(PORT, function(err){
    if (err) console.log(err);
    console.log("Server listening on PORT", PORT);
});

Steps to run the program:

1. The project structure will look like this:
   
2. Make sure you have installed express module using the following command:

   npm install express

3. Run index.js file using below command:

   node index.js

   Output:

   Server listening on PORT 3000
   

4. Now make a POST request to http://localhost:3000/ with header set to ‘content-type’ – ‘application/octet-stream’ and body { “name”:”GeeksforGeeks” }, then you will see the following output on your screen:
   

Example 2: Filename: index.js

var express = require('express');
var app = express();
var PORT = 3000;

// Without this middleware
// app.use(express.raw());
app.post('/', function (req, res) {
    console.log(req.body);
    res.end();
})

app.listen(PORT, function(err){
    if (err) console.log(err);
    console.log("Server listening on PORT", PORT);
});

Run index.js file using below command:

node index.js

Now make a POST request to http://localhost:3000/ with header set to ‘content-type’ – ‘application/octet-stream’ and body { “name”:”GeeksforGeeks” }, then you will see the following output on your screen:

Server listening on PORT 3000
undefined

Reference: Offical Documentation