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Node.js express - body of POST request is always empty

I am trying to read the body of POST request using Express in Node.JS framework. I send a HTTP POST request using HTML form. I detected a POST request on WireShark with the following data:
This shows that the request is sent successfully. I expected JSON format, which is the one that Express successfully parsed for me, but this format just doesn't seem to work no matter what I tried. My current implementation goes like this:
var express = require('express');
var bodyParser = require('body-parser');
var app = express();
var jsonParser = bodyParser.json()
//Import static files
app.use(express.static('../public'))
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
app.post('/', jsonParser, (req, res) => {
console.log(req.body);
res.send(200);
});
app.listen(port, () => console.log("Server started"));
No matter what I try from other posts, it still does not seem to return me any data.
Does anyone have an idea how to fix this problem?

Why to you use 'jsonParser' in the app route? Try something like:
const express = require('express');
const bodyParser = require('body-parser');
const app = express();
app.use(bodyParser.urlencoded({ extended: true }));
app.post('/post-test', (req, res) => {
console.log('Got body:', req.body);
res.sendStatus(200);
});

returning undefined for get request

I have been doing a project in URL shortening and i am getting an undefined as a result to get request.
Also i get a blank page too as result,but according to my knowledge everything is ok,i can't figure out what is the mistake
Here's my code(please check the app.get section)
'use strict';
var bodyParser = require('body-parser')
var express = require('express');
var mongo = require('mongodb');
var mongoose = require('mongoose');
var http = require("http");
var cors = require('cors');
const dns = require('dns');
var app = express();
// Basic Configuration
var port = process.env.PORT || 3000;
/** this project needs a db !! **/
// mongoose.connect(process.env.DB_URI);
app.use(cors());
/** this project needs to parse POST bodies **/
// you should mount the body-parser here
app.use('/public', express.static(process.cwd() + '/public'));
app.get('/', function(req, res){
res.sendFile(process.cwd() + '/views/index.html');
});
// your first API endpoint...
app.get("/api/hello", function (req, res) {
res.json({greeting: 'hello API'});
});
mongoose.connect(process.env.MONGO_URI, { useNewUrlParser: true, useUnifiedTopology: true });
var saveSchema = new mongoose.Schema({
name: String,
url: Number,
});
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
/** 3) Create and Save a Person */
var SaveData = mongoose.model('Save', saveSchema);
//**Here's the start of my problem,i think**
app.get("/api/shorturl/:id1",function(req,res){
SaveData.find({url:1},function(err,data){ console.log(data.name)//**i am getting undefined for this in console**
res.json(data.name);})
});
app.post("/api/shorturl/new",(req,res)=>{
var body=req.body.url;
dns.lookup(body,(err,data)=>{
var new2= new SaveData({name:body,url:1});
new2.save((err,data)=>{res.json(new2);});
})
});
app.listen(port, function () {
console.log('Node.js listening ...');
});
I checked my DB whether the schema data is inputted or not, it is getting inside DB, so retrieval makes the problem I think.

mongoose.model.prototype.find returns an array of objects found. If you type Array.prototype.name in a console somewhere, you'll get undefined. Instead, use mongoose.model.prototype.findOne.

Your enviorment variables are working? I notice you're not using dotenv module or something like that to configure your process.env.

Express.js req.body is undefined when getting callback

I'm trying to receive a callback from the Dribbble Auth API. The Authentication process is working fine until I'm trying to fetch the response data with NodeJS.
My Callback-URL is http://localhost:8080/callback
A callback url looks like this http://localhost:8080/callback?code=11ee328ab7935bd7240cbff0a2d0b8c93e96547e0a3&state=aoksdmSAOKDm
I'm using body-parser and multer.
var express = require("express");
var multer = require("multer");
var bodyParser = require("body-parser");
var cookieParser = require("cookie-parser");
var upload = multer({ storage: multer.memoryStorage() });
var app = express();
app.use(cookieParser());
app.use(bodyParser.urlencoded({
extended: true
}));
app.use(bodyParser.json());
app.use(express.static(path.join(__dirname, "../webapp/")));
app.get("/callback", upload.single("code"), (req,res) => {
console.log(req.body);
res.send()
}
The response in the console is undefined

the query isn't in req.body with a GET request. you have to do:
req.query

You are sending a GET request.Please check
req.query
More details refer
http://expressjs.com/en/api.html

How to pass over an argument with POST method? NodeJS

So, as you may see I was the creator of the question "I am having this problem by passing over GET method". But now having kind of a problem with "Passing over with POST method" Here is my code to see what is going wrong. All I want to do is to print to say : "Hello (Whatever the user pass over name of).. If ExpressJS, doesn't work, can anyone show me in Javascript way?!
Here is the code.
var server = require('./server');
var router = require('./router');
var requestHandlers = require('./requestHandlers');
var handle = {
'/': requestHandlers.start,
'/start': requestHandlers.start,
'/upload': requestHandlers.upload,
'/show': requestHandlers.show
};
var express = require('express')
var app = express()
app.post('/view/users/:name', function(req, res) {
console.log(req.body.desc);
res.end();
});
app.listen(8080, function () {
console.log('listening on port 8000!')
})
The error I get when passing over is "Cannot GET /view/users/John"

you can access the path variable :name from req.params object
app.get('/view/users/:name', function(req, res) {
console.log(req.params.name);
res.end();
});

You need to add bodyParser before your routes:
var bodyParser = require('body-parser')
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
and then whatever you pass to the route, bodyParser will make it available within the request object.

Sending json with $.post in express/node

This is my app.js file:
var express = require('express');
var app = express();
var path = require('path');
var $ = require('jquery');
var nodemailer = require('nodemailer');
app.use('/static', express.static(path.join(__dirname, 'static')));
app.get('/', function(req, res) {
res.sendFile('./views/index.html', {"root": __dirname});
});
app.post('/contact/', function(req, res){
console.log(req.body);
});
and my post request from another file, which is called when a form is submitted:
$('form').submit(function(e){
e.preventDefault();
var content = $('#message').val();
var email = $('#EmailInput').val();
var reason = $('#reason').val();
$.post('/contact', { 'content': content, 'email': email, 'reason': reason }, function(data){
console.log(data);
});
})
However, whenever the form is submitted, the post request is successful, it's just no data has been passed.
req and req.body both return undefined. I can't figure out why.

you need the body parser to populate the body property of the request object
npm install body-parser
then include
var bodyParser = require('body-parser');
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended: true}));
documentation for your particular use case and tweaking may be found here
edit: be sure to include this BEFORE your route handlers are declared