index.js

var fs = require('fs')
var  path = require('path')
var  _ = require('underscore');

var request = require('request')

// Return only base file name without dir
function getMostRecentFileName(dir) {
    var files = fs.readdirSync(dir);

    // use underscore for max()
    return _.max(files, function (f) {
        var fullpath = path.join(dir, f);

        // ctime = creation time is used
        // replace with mtime for modification time
        return fs.statSync(fullpath).ctime;
    });
}

//console.log(getMostRecentFileName("."))

var requestLoop = setInterval(function(){
  var recent = getMostRecentFileName(".")
 console.log(recent)
  var json = JSON.parse(fs.readFileSync(recent))
  console.log(json.people.length)
  request({
      url: "https://hackuva.localtunnel.me/people",
      method: "POST",
      timeout: 10000,
      followRedirect: true,
      maxRedirects: 10,
      form : {num: json.people.length, room: "living"}
  },function(error, response, body){
      if(!error && response.statusCode == 200){
          console.log('suces!');
      }else{
          console.log('error' + response.statusCode);
      }
  });
}, 100);