body parser express

//make sure it is in this order
npm i body-parser

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

const app = express()

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

// parse application/json
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))
})

var express = require("express");
var app = express();
var bodyParser = require("body-parser");
app.use(bodyParser.urlencoded({extended: true}));

$ npm install body-parser

//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})); 

// Express/Connect top-level generic
// 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. 
// This is the simplest setup.

var express = require('express')
var bodyParser = require('body-parser') 
var app = express() 

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

// parse application/json
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))})

var express = require('express')
  var bodyParser = require('body-parser')
  var app = express()
  // parseapplication/x-www-form-urlencoded
  app.use(bodyParser.urlencoded({ extended: false }))
  // parse application/json
  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))})

var bodyParser = require('body-parser')

<script>
const bodyParser = require("body-parser");

app.use(bodyParser.urlencoded({extended:true}));
  
app.post("/", function(req, res){
  let firstName = req.body.fNAME;
  
});
</script>

<input type="text" name="fNAME" placeholder="First Name">

const jsonParser = bodyParser.json()

const urlencodedParser = bodyParser.urlencoded({ extended: false })

// parse application/json
app.use(bodyParser.json())