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I'm very new with NodeJS. I'm trying to create a simple server that has a connection to my mongoDB Atlas database but when I run my server I get this error:

UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1) (node:8825) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Seems to be a common problem based on what I googled, I added the try/catch but it still isn't working.

'use strict';
    //const AWS = require('aws-sdk');
    const express = require('express');
    const mongoose = require('mongoose');
    const uuidv4 = require('uuid/v4');

    //exports.handler = (event, context, callback) => {
    mongoose.connect(
      'mongodb+srv://xxxx:[email protected]/test?retryWrites=true',
      {
        useNewUrlParser: true
      }
    ),
      () => {
        try {
          //something
        } catch (error) {
          console.error(error);
        }
      };
    const connection = mongoose.connection;

    connection.once('open', () => {
      console.log('

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