what is the role of bodyParser code example

Example 1: bodyparser purpose

//body-parser helps parse json files
//you can use body-parser anytime you need to use a form to post
//data to a request
var bodyParser = require("body-parser"); 
app.use(bodyParser.urlencoded({extended: true}));

Example 2: bodyparser

var bodyParser = require('body-parser')

// parse application/x-www-form-urlencoded
app.use(bodyParser.urlencoded({ extended: false }))
 
// parse application/json
app.use(bodyParser.json())