https://stackoverflow.com/questions/62718461/how-can-i-see-a-description-of-the-error-that-has-occurred-in-node-js-express-wh

index.js

router.post('/createServer', function (req, res, next) {
  try {
    let server = req.body;

    io.of(server.endpoint).on('connection', (socket) => {
      console.log('Socket connected!');

      socket.on('messageToServer', (message) => {
        console.log('Message on socket');

        let roomName = Object.keys(socket.rooms)[1];
        let room = server.room.find((room) => {
          return room.name == roomName;
        });

        room.history.push(message);
        io.of(server.endpoint).to(roomName).emit('messageToClient', message);
      });

      socket.on('joinRoom', (roomToJoin) => {
        console.log('Someone has joined room');
        
        let roomToLeave = Object.keys(socket.rooms)[1];
        let room = server.room.find((room) => {
          return room.name == roomToJoin;
        });

        socket.leave(roomToLeave);
        socket.join(roomToJoin);

        socket.emit('chatHistory', room.history);
      });
    });
  } catch (error) {
    console.trace(error);
  }
});