Body-parser is a middleware for Node.js used to parse incoming request bodies in a middleware before any handlers. This make the req.body property available to use. Most commonly this is used to handle different form data.
Body-parser has been deprecated in Express 4.16.0+ as most of its functionality is now included in Express. The express.json()and express.urlencoded() methods are direct replacements.
// To parse URL-encoded payloads
app.use(bodyParser.urlencoded({ extended: true }));
// or use the one available with express
app.use(express.urlencoded({ extended: true }));