server.js

var app = require('express')();
var http = require('http').Server(app);
var io = require('socket.io')(http);

var os = require('os');
var html_dir = '/html+css/';
var router = require('express').Router();

//this does not work
router.use(function(req, res, next) {
    res.sendFile(__dirname + html_dir + 'desktop.html');
    console.log('res sendfile');
  console.log('%s %s %s', req.method, req.url, req.path);
  next();
});

//this does not work either
router.use('/',function(req, res,next) {
    res.sendFile(__dirname + html_dir + 'desktop.html');
    console.log('res sendfile');
    next();
});

//however, 'http 37098 running' gets clogged.
    http.listen(37098, function(){
        console.log('http 37098 running');
        console.log(html_dir);
        console.log(__dirname);
    });

//this does not work
app.use('/',function(req, res,next) {
    res.sendFile(require('path').resolve(html_dir + 'desktop.html'));
    console.log('res sendfile');
    next();
});

//this does not work
app.get('/', function(req, res) {
    console.log("es");
    res.sendFile(require('path').resolve(html_dir + 'desktop.html'));
});

//i havent even tried the lines after this
app.get('/phone', function(req, res) {
    res.sendfile(html_dir + 'phone.html');
});
app.get('/back.png', function(req, res) {
    res.sendfile(html_dir + 'back.png');
});

/*app.get("/", app.authenticateUser, function (req, res) {
    res.redirect(html_dir + 'phone.html');
});
 res.set({ 'content-type': 'application/json; charset=utf-8' })*/





        app.use( function(req, res, next) {

    // this line of code will see that the 
    // request is for "/" and fire
    if (req.url == '/') {
        // the page now appears to render, because you are forcing the
        // res.render code inside of your middleware, which isn't always
        // recommended, but it is working for you in this example
        // because its the only place in your example that can do anything
        // when the '/' request is made
    //res.sendfile(html_dir + 'desktop.html');
        console.log('res sendfile');
    } else {
        // this is common middleware design pattern, the next()
        // function tells the express framework to "move on to the next function"
        // in the middleware stack
        console.log('a');
        next();
    }
});
var bedrijfsnamen = [];
var clients = [];
var socketids = [];
var bedrijven = [];
var ontvanger = [];
var userss = [];
io.on('connection', function(socket){
  socket.on('chat', function(msg,k,recipient){
      var h = [];
      if(arguments[0].afz==false||arguments[0].afz==true){h.push(JSON.parse(JSON.stringify(arguments[0])))}
      if(arguments[1].afz==false||arguments[1].afz==true){h.push(JSON.parse(JSON.stringify(arguments[1])))}
      if(arguments[2]!=undefined){
      if(arguments[2].afz==false||arguments[2].afz==true){h.push(JSON.parse(JSON.stringify(arguments[2])))}}
      var kk = h[0];
      setTimeout(function(){
      if(kk.afz===false) {
          console.log(kk);
      //wordt verzonden naar bedrijf
          console.log('NAAR BEDRIJF');
          var a = bedrijven.filter(function(e){
              return recipient.bedrijfsnaam ==e.bedrijfsnaam;
          });
          if(a){var b0 = a[0];}
          var o=[];
          if(a!=null&&a!=0&&a!=undefined&&a.length!=0){
              var b = userss.filter(function(e){
              return e.mail ==kk.mail;
                });
              if(userss.indexOf(b[0])==-1){console.log('return false;');return false;}else{
              kk.index=userss.indexOf(b[0]);}
              if(userss[kk.index].chats.length==0){
                    var uchat = new Object;
                  q(uchat);
              } else{
                  var zid=userss[kk.index].chats.filter(function(e){
                      return e.name==recipient.bedrijfsnaam && e.vac==k.vacatures;
                  });
                  if(zid!=null&&zid!=0&&zid!=undefined&&zid.length!=0){
                      var inde = userss[kk.index].chats.indexOf(zid[0]);
                      var mm = new Object;
                      mm.afz = 's';
                      mm.content = msg;
                      userss[kk.index].chats[inde].msgs.push(mm);
                      console.log(userss[kk.index].chats[inde],'userss[kk.index].chats[inde]');
                      userss[kk.index].chats[inde].vac=kk.vacatures;
                      console.log(kk);
                      var ei = userss[kk.index];
                      console.log(userss[kk.index]);
                      io.to(userss[kk.index].id).emit('chat message', msg,ei,recipient);
                  } else {
                    var uchat = new Object;
                  q(uchat);
                      console.log(',zidwasonvindbaar');
}
              }
              function q(uchat){
                if(!uchat.name){
                    uchat.name=recipient.bedrijfsnaam;
                }
                                if(!uchat.msgs){
                                    uchat.msgs=new Array;
                                }
                                uchat.vac = kk.vacatures;
                var mm = new Object;
                mm.afz = 's';
                mm.content = msg;
                uchat.msgs.push(mm);
                  userss[kk.index].chats.push(uchat);
                     var ei = userss[kk.index];
                           console.log(userss[kk.index]);
                  io.to(userss[kk.index].id).emit('chat message', msg,ei,recipient);
                  console.log('CHAT MESSAGE SenT TO USER');
              }
              for(i=0;i<b0.vacatures.length;i++){
                  if(b0.vacatures[i].name==kk.vacatures){
                      if(b0.vacatures[i].chats.length!=0){
                            for(ii=0;ii<b0.vacatures[i].chats.length;ii++){
                            if(b0.vacatures[i].chats[ii].k==kk.index){
                              var chat = b0.vacatures[i].chats[ii];
                              console.log('tha case');
                          var mm = new Object;
                          mm.afz = 's';
                          mm.content = msg;
                          chat.msgs.push(mm);
                          } else{
                            var chat = new Object;
                              y(chat);
                          }
                      }
                      } else {
                            var chat = new Object;
                              y(chat);
                      }
                        function y(chat){
                          chat.k = kk.index;   
                            var u = Math.random();var u = u*10000;var u = Math.round(u);
                            chat.name = u;
                          chat.msgs =[];
                          var mm = new Object;
                          mm.afz = 's';
                          mm.content = msg;
                          chat.msgs.push(mm);
                        b0.vacatures[i].chats.push(chat);
                            console.log(chat);
                            console.log(b0.vacatures[i].chats);
                            console.log(chat.msgs);
                      }
                      if(o.length!=0){o.length=0}
                      o.push(b0);
                  }
              }
              var j = o[0];
                  setTimeout(function(){delete kk.mail;io.to(a[0].id).emit('chat message', msg, kk,j);},40);
          } 
      } else{
          //gaat naar sollicitant
          console.log('NAAR SOLLICITANT');
          var b = bedrijven.filter(function(e){
              return e.bedrijfsnaam==kk.bedrijfsnaam;
          });
          var bi =bedrijven.indexOf(b[0]);
          var c = b[0].vacatures.filter(function(e){
              return e.name ==kk.vacature;
          });
          var vi = bedrijven[bi].vacatures.indexOf(c[0]);
          var d = bedrijven[bi].vacatures[vi].chats.filter(function(e){
              return e.k==kk.ai;
          });
          var di = bedrijven[bi].vacatures[vi].chats.indexOf(d[0]);
          var mm = new Object;
          mm.afz = 'b';
          mm.content = msg;
          bedrijven[bi].vacatures[vi].chats[di].msgs.push(mm);
          setTimeout(function(){
              io.to(bedrijven[bi].id).emit('chat message', msg, kk);
          },4000);
          userss[kk.ai].chats.forEach(function(e){
              if(e.name==bedrijven[bi].bedrijfsnaam){
                  var h=new Object;
                  h.afz='b';
                  h.content=msg;
                  e.msgs.push(h);
                  var ei = userss[kk.ai];
                    io.to(userss[kk.ai].id).emit('chat message', msg,ei);
              }
          })
      }
          
      },50);
  });
    socket.on('loginb',function(login){
        var a = bedrijven.filter(function (e) {
            return e.bedrijfsnaam == login.bnaam && e.pwd==login.pwd;
        });
        var b = a[0];
        if(a==null){socket.emit('loginb',false)} else {socket.emit('loginb',b)}
    });
    socket.on('updateID', function(data){
        var a = userss.filter(function(e){
            return e.mail == data.mail;
        });
        if(a!=null&&a!=0&&a!=undefined&&a.length!=0){
            if(userss.indexOf(a[0])==-1){return false;}else{
                userss[userss.indexOf(a[0])].id = data.id;
            }
        }
        setTimeout(function(){
            console.log('ai',ai);
                socket.emit('bedrijven', ai);
            },400);
    });
    
    socket.on('update', function(bedrijf) {
        var a = bedrijven.filter(function(e){
              return bedrijf.bedrijfsnaam ==e.bedrijfsnaam;
          });
          if(a!=null&&a!=0&&a!=undefined&&a.length!=0){
              var index = bedrijven.indexOf(a[0]);
              bedrijven[index].id = bedrijf.id
              bedrijven[index].sollicitatievragen=bedrijf.sollicitatievragen;
              socket.emit('update',bedrijven[index]);
          } else {return false;}
    });
    
    
    socket.on('newUser', function(data){
        var a = userss.filter(function(e){
            return e.mail == data.mail;
        });
        if(a!=null&&a!=0&&a!=undefined&&a.length!=0){
            return false;
        } else{
            data.chats=new Array;
            userss.push(data);
        }
        console.log(userss);
    });
    socket.on('email', function(data){
        var a = userss.filter(function(e){
            return e.mail == data;
        });
        //if(a!=null&&a!=0&&a!=undefined&&a.length!=0){
            
        //}
        if(a==undefined||a.length==0||a==null||a==0){socket.emit('email',null)}else{socket.emit('email',a[0].mail)}
    });
    socket.on('login', function(data){
        console.log(data);
        var a = userss.filter(function(e){
            return e.mail == data.mail && e.pwd == data.pwd;
        });
        var b= a[0];
        if(a==null){socket.emit('login', 0)} else{
            socket.emit('login', b);
        }
    });
    socket.on('bedrijfobj', function(data){
        console.log(bedrijven);
        var bedrijf ={};
        bedrijf.bedrijfsnaam = data.bedrijfsnaam;
        bedrijf.vacatures = data.vacatures;
        bedrijf.id=socket.id;
        bedrijf.pwd=data.pwd;
        bedrijf.bedrijfscultuur=data.bedrijfscultuur;
        if(bedrijfsnamen.indexOf(data.bedrijfsnaam)==-1){
            bedrijfsnamen.push(bedrijf.bedrijfsnaam);
            bedrijven.push(bedrijf);
            console.log(bedrijven);
            console.log(bedrijf.vacatures);
            socket.emit('bedrijf', bedrijf);
            setTimeout(function(){socket.broadcast.emit('bedrijven', ai);
            console.log(bedrijven,ai,kopie);},400);
            } else{
                socket.emit('alr', 'alr');
            }
});
var kopie = JSON.parse(JSON.stringify(bedrijven));
        var ai = b(kopie);
        function b(kopie){
                kopie.forEach(func);
                function func(e) {
                    for(i = 0; i < e.vacatures.length; i++){
                        if(e.vacatures[i].name){
                            e.vacatures[i]=e.vacatures[i].name
                        }
                    }
                    delete e.pwd;
                }
            console.log(kopie);
                return kopie;
            }
   // socket.on('phone', function(data){
     //   socket.emit('stuurbedrijfsnaam', 'stuurbedrijfsnaam');
       //     socket.on('connection', function(socket){
//    } 
//             );
//});
io.sockets.on('connect', function(socket) {
  var sessionid = socket.id;
});
});

look at the first few lines to see the problem