server.js

var express = require('express');
var http = require('http');
var app = express();
var body = require('body-parser');
var geolib = require('geolib');

app.use(body.urlencoded({ extended: false }))
 
// parse application/json 
app.use(body.json())

app.post('/location',function(req,res){
  var lat = req.body.lat;
  var long = req.body.long;
  console.log(lat+' '+long);
var dis = geolib.getDistance(
    {latitude: lat, longitude: long},
    {latitude: 9.99, longitude: 78.0822 });
console.log(dis);
  res.send('okay');
});

http.createServer(app).listen(3000,'0.0.0.0');