express throws error as `body-parser deprecated undefined extended`

In my node app, I am using express. all works fine, But i am getting error in the cmd. I use all are updated modules...

my code :

var express = require('express');
var bodyParser = require('body-parser');
var jade = require('jade');
var app = express();
app.set('view engine', 'jade');
app.set('views', __dirname + '/views');
app.use(express.static(__dirname + '/public'));


app.use(bodyParser.json()); // to support JSON-encoded bodies
app.use(bodyParser.urlencoded()); // to support URL-encoded bodies


app.get('/',function(req,res){
	res.render('index.jade');
});

app.get('/login',function(req,res){
	res.render('index.jade');
});

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

app.get('/signup',function(req,res){
	res.render('signup.jade');
});

var env = process.env.PORT || 3000;


app.listen(env, function(req, res){
	console.log('i am working!');
});

Error:

D:\myLogin>node app
body-parser deprecated undefined extended: provide extended option app.js:11:20 //why i am getting this?
i am working!
{ username: '[email protected]', password: 'pass' } // i am getting response

Can any help me to understand this issue please?

You have to explicitly set extended for bodyParser.urlencoded() since the default value is going to change in the next major version of body-parser. Example:

app.use(bodyParser.urlencoded({ extended: true }));

Since express 4.16.0, you can also do:

app.use(express.urlencoded({ extended: true }))

Attention: With express version => 4.16.0 the body-parser middleware was added back under the methods express.urlencoded() and express.json()

Which can be used as:

app.use(express.urlencoded({extended: true})); 
app.use(express.json());   

The error says you need to provide the extended option for the body-parser like so:

app.use(bodyParser.urlencoded({ extended: false }))

If you facing 'bodyParser' is deprecated.

Just do

app.use(express.urlencoded({extended: true})); 
app.use(express.json());

Note: If you are using 4.16.0 or later express version.

Don't use body-parser

It's now built-in with new versions of Express, you can access request body just like this only using express:

app.use(express.urlencoded({extended: true}));
app.use(express.json()) // To parse the incoming requests with JSON payloads

Hence, you can now uninstall body-parser using npm uninstall body-parser

To get the POST content, you can use req.body

app.post("/yourpath", (req, res)=>{

    var postData = req.body;

    //Or if this doesn't work

    var postData = JSON.parse(req.body);
});

As from Express version 4.16.0, you're expected to pass in extended property inside the bodyParser.urlencoded()

//  parse JSON-encoded bodies and URL-encoded bodies
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));

See npm.js documentation page for sample: https://www.npmjs.com/package/body-parser#expressconnect-top-level-generic

If you're using Node v16.xx.x and "express": "^4.17.x" and above, there is no need again to use bodyPerser. It is now incorporated with express by default. Simply do the following below:

//  parse JSON-encoded bodies and URL-encoded bodies
app.use(express.json());
app.use(express.urlencoded({ extended: false }));

If you're using Node v16.xx.x and "express": "^4.17.x", there is no need again to use bodyPerser. It is now incoporated with Express by default. Simply do the following below:

//  parse JSON-encoded bodies and URL-encoded bodies
app.use(express.json());
app.use(express.urlencoded({ extended: false }));

If you are using node version v13.12.0:

app.use(express.urlencoded({ extended: true }))

You don`t need "body-parser" explicitly installed now. This will work

app.use(express.json());

if you are here after christmas from 2020 you just have to put the midlawares in order before your express declaretion and after the routes declarationenter image description here

> Set limit 50 MB for avoid data handling error., In urlencode limit > 50mb is for help you to pass imageData throw url

  app.use(bodyParser.json({
        limit : '50mb'    ///////// LIMIT for JSON
      }));
    
    app.use(bodyParser.urlencoded({
        limit : '50mb', ///////// LIMIT for URL ENCODE (image data)
        extended : true
      }));