Why will my server code with the MongoDB extension work locally on my computer but not on the DigitalOcean server?

Hi,

I have made an Authentication API with Node.js and MongoDB which works perfectly on my local machine. As soon as I upload it to Digital Ocean with Ubuntu, however, everything that doesn’t rely on MongoDB works (for example, I have some validation code that checks if the send email is actually an email or not and if it isn’t I get the appropriate response back so the nod.js code is working without errors.) However, if I send details that require to use the MongoDB part of the code, nothing happens. I send the request through Postman and it just stays on ‘Sending request’. When I connect to the database, it prints out “Database connected” so it connects to the database correctly, just won’t do any of the queries I ask it to do.

Am I missing something or any steps I haven’t gone through? I haven’t got a firewall on the Ubuntu Server either so anything should go through it.