Mongoose is unable to connect with DB running on Kubernetes: ECONNREFUSED 127.0.0.1:27017

Question

I have a MongoDB running in a Kubernetes Pod. The Pod is forwarded to my 27017 Port on localhost. Opening localhost:21017 returns It looks like you are trying to access MongoDB over HTTP on the native driver port.. Additionaly I can connect to my DB via DataGrip.

However, when I try to create a connection with node.js it fails with the said error: MongooseServerSelectionError: connect ECONNREFUSED 127.0.0.1:27017

Checking my running services under Task-Manager -> Services displays no MongoDB. However I assume that this is right since my DB is running under Kubernetes on a Remote Server. Right?

Can someone tell me what I'm doing wrong?

Here's my code:

const mongoose = require('mongoose')

mongoose.connect('mongodb://127.0.0.1:27017/testing')
    .catch(error => {
        console.log("Error with message: " + error.message)
    })

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Update:

The above code works, if it's being executed in VSCode. When I try to run it in WebStorm it somehow doesn't. If anyone has made the same experience and knows the cause for this I'd love to know.