[node.js] MongoError: connect ECONNREFUSED 127.0.0.1:27017

In my particular instance, I was connected to a VPN and that was blocking the localhost connection to MongoDB somehow. It worked when I disconnected my VPN. It's a special case, but good to know nonetheless. So anything impeding your network connectivity, Get that fixed.

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Server Discovery And Monitoring engine is deprecated Avoid "current URL string parser is deprecated" warning by setting useNewUrlParser to true MongoNetworkError: failed to connect to server [localhost:27017] on first connect [MongoNetworkError: connect ECONNREFUSED 127.0.0.1:27017] Failed to auto-configure a DataSource: 'spring.datasource.url' is not specified Failed to start mongod.service: Unit mongod.service not found db.collection is not a function when using MongoClient v3.0 MongoError: connect ECONNREFUSED 127.0.0.1:27017 MongoDB: How To Delete All Records Of A Collection in MongoDB Shell? How to resolve Nodejs: Error: ENOENT: no such file or directory How to create a DB for MongoDB container on start up?