Want zero warnings? Use it like this:

// Express v4.16.0 and higher
// --------------------------
const express = require('express');

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

// For Express version less than 4.16.0
// ------------------------------------
const bodyParser = require('body-parser');

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

Explanation: The default value of the extended option has been deprecated, meaning you need to explicitly pass true or false value.

Note for Express 4.16.0 and higher: body parser has been re-added to provide request body parsing support out-of-the-box.

If you're using express > 4.16, you can use express.json() and express.urlencoded()

The express.json() and express.urlencoded() middleware have been added to provide request body parsing support out-of-the-box. This uses the expressjs/body-parser module module underneath, so apps that are currently requiring the module separately can switch to the built-in parsers.

Source Express 4.16.0 - Release date: 2017-09-28

With this,

const bodyParser  = require('body-parser');

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

becomes,

const express = require('express');

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

Don't use body-parser

If you are using Express 4.16+ You can do it just like this with express:

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

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);
});

I hope this helps

Even I faced the same issue. The below change I mentioned resolved my problem.

If you're using Express 4.16+ version, then

• You may have added a line to your code that looks like the following:

app.use(bodyparser.json()); //utilizes the body-parser package

• You can now replace the above line with:

app.use(express.json()); //Used to parse JSON bodies

This should not introduce any breaking changes into your applications since the code in express.json() is based on bodyparser.json().

• If you also have the following code in your environment:

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

• You can replace the above line with:

app.use(express.urlencoded()); //Parse URL-encoded bodies

• If you're getting a warning saying that you still need to pass extended to express.urlencoded() then, do update the above code as:

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

A final note of caution:

You might not need to install the additional body-parser package to your application if you are using Express 4.16+. There are many tutorials that include the installation of body-parser because they are dated prior to the release of Express 4.16.

In older versions of express, we had to use:

app.use(express.bodyparser()); 

because body-parser was a middleware between node and express. Now we have to use it like:

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

body-parser is a piece of express middleware that reads a form's input and stores it as a javascript object accessible through req.body 'body-parser' must be installed (via npm install --save body-parser) For more info see:

   var bodyParser = require('body-parser');
   app.use(bodyParser.json()); // support json encoded bodies
   app.use(bodyParser.urlencoded({ extended: true })); // support encoded bodies

When extended is set to true, then deflated (compressed) bodies will be inflated; when extended is set to false, deflated bodies are rejected.

Instead of bodyParser.json(), simply use express.json(), You don't want to install body-parser

For an instance,

const express = require("express");

const app = express();
app.use(express.json());

I found that while adding

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

helps, sometimes it's a matter of your querying that determines how express handles it.

For instance, it could be that your parameters are passed in the URL rather than in the body

In such a case, you need to capture both the body and url parameters and use whichever is available (with preference for the body parameters in the case below)

app.route('/echo')
    .all((req,res)=>{
        let pars = (Object.keys(req.body).length > 0)?req.body:req.query;
        res.send(pars);
    });

What is your opinion to use express-generator it will generate skeleton project to start with, without deprecated messages appeared in your log

run this command

npm install express-generator -g

Now, create new Express.js starter application by type this command in your Node projects folder.

express node-express-app

That command tell express to generate new Node.js application with the name node-express-app.

then Go to the newly created project directory, install npm packages and start the app using the command

cd node-express-app && npm install && npm start

body-parser deprecated bodyParser: use individual json/urlencoded middlewares node_modules\express\lib\router\layer.js:95:5

express deprecated req.host: Use req.hostname instead node_modules\body-parser\index.js:100:29

body-parser deprecated undefined extended: provide extended option node_modules\body-parser\index.js:105:29

No need to update express or body-parser

These errors will be removed. Follow these steps :-

1. app.use(bodyParser.urlencoded({extended: true})); // This will help in encoding.
2. app.use(bodyParser.json()); // this will support json format

It will run.

Happy Coding!

Check this answer Stripe webhook error: No signatures found matching the expected signature for payload

// Use JSON parser for all non-webhook routes
app.use((req, res, next) => {
  if (req.originalUrl === '/webhook') {
    next();
  } else {
    express.json()(req, res, next);
  }
});

// Stripe requires the raw body to construct the event
app.post('/webhook', express.raw({type: 'application/json'}), (req, res) => {
  const sig = req.headers['stripe-signature'];

  let event;

  try {
    event = stripe.webhooks.constructEvent(req.body, sig, webhookSecret);
  } catch (err) {
    // On error, log and return the error message
    console.log(`❌ Error message: ${err.message}`);
    return res.status(400).send(`Webhook Error: ${err.message}`);
  }

  // Successfully constructed event
  console.log('✅ Success:', event.id);

  // Return a response to acknowledge receipt of the event
  res.json({received: true});
});