The localhost of Mongod does not seem to be connecting properly with the 'npm start' command of my program

I'm currently developing a prototype program that handles account registrations, and my approach involves utilizing Node.JS to write JavaScript code that can be utilized on mobile devices.

After downloading MongoDB and setting up the data/db directory to support it, using version 4.0.2 to ensure compatibility with Windows 8.1, I attempted to run the mongod command in the command prompt to initiate the local server with npm. However, it seems that MongoDB is not functioning correctly. The error messages displayed are as follows:

C:\Users\user>mongod
2021-08-03T17:40:37.119-0300 I  CONTROL  [main] Automatically disabling TLS 1.0,
 to force-enable TLS 1.0 specify --sslDisabledProtocols 'none'
2021-08-03T17:40:38.707-0300 W  ASIO     [main] No TransportLayer configured dur
ing NetworkInterface startup
2021-08-03T17:40:38.710-0300 I  CONTROL  [initandlisten] MongoDB starting : pid=
3624 port=27017 dbpath=C:\data\db\ 64-bit host=user-pc
...
2021-08-03T17:40:42.126-0300 I  SHARDING [ftdc] Marking collection local.oplog.r
s as collection version: <unsharded>

What steps should I take to resolve this issue and make MongoDB work correctly?

javascriptmongodbnpm-start

Answer №1

Your MongoDB instance is functioning properly, as indicated by the following log entries:

2021-08-03T17:40:41.951-0300 I  NETWORK  [listener] Listening on 127.0.0.1
2021-08-03T17:40:41.952-0300 I  NETWORK  [listener] waiting for connections on port 27017

This confirms that your Mongo is running smoothly. However, there seems to be an error indicating:

UnhandledPromiseRejectionWarning: MongoError: Authentication failed.

This suggests that there might be an issue with your credentials (username and password), and you are also missing error handling when attempting to connect to MongoDB (using a try/catch block), leading to the UnhandledPromiseRejectionWarning

npm start is a standard npm script for launching your application and is unrelated to your MongoDB instance.

I recommend downloading Robo3T (or another client) to verify if you can establish a connection to your MongoDB instance there first. Once successful, you can proceed with testing the connection from Node.js

I hope this explanation helps clarify the situation :)

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