1$ npm install body-parser

1// Express/Connect top-level generic
2// This example demonstrates adding a generic JSON and URL-encoded parser as a top-level middleware, which will parse the bodies of all incoming requests. 
3// This is the simplest setup.
4
5var express = require('express')
6var bodyParser = require('body-parser') 
7var app = express() 
8
9// parse application/x-www-form-urlencoded
10app.use(bodyParser.urlencoded({ extended: false })) 
11
12// parse application/json
13app.use(bodyParser.json()) 
14
15app.use(function (req, res) {
16  res.setHeader('Content-Type', 'text/plain')  
17  res.write('you posted:\n')  
18res.end(JSON.stringify(req.body, null, 2))})

1var express = require('express')
2  var bodyParser = require('body-parser')
3  var app = express()
4  // parseapplication/x-www-form-urlencoded
5  app.use(bodyParser.urlencoded({ extended: false }))
6  // parse application/json
7  app.use(bodyParser.json()) app.use(function (req, res) {  res.setHeader('Content-Type', 'text/plain')  res.write('you posted:\n')  res.end(JSON.stringify(req.body, null, 2))})

1<script>
2const bodyParser = require("body-parser");
3
4app.use(bodyParser.urlencoded({extended:true}));
5  
6app.post("/", function(req, res){
7  let firstName = req.body.fNAME;
8  
9});
10</script>
11
12<input type="text" name="fNAME" placeholder="First Name">

1var express = require('express')
2var bodyParser = require('body-parser')
3
4var app = express()
5
6// create application/json parser
7var jsonParser = bodyParser.json()
8
9// create application/x-www-form-urlencoded parser
10var urlencodedParser = bodyParser.urlencoded({ extended: false })
11
12// POST /login gets urlencoded bodies
13app.post('/login', urlencodedParser, function (req, res) {
14  res.send('welcome, ' + req.body.username)
15})
16
17// POST /api/users gets JSON bodies
18app.post('/api/users', jsonParser, function (req, res) {
19  // create user in req.body
20})

1 npm i body-parser 
2 npm i -g body-parser //for global
3