MongoServerSelectionError: connect ECONNREFUSED ::1:27017

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(node:15855) UnhandledPromiseRejectionWarning: MongooseServerSelectionError: connect ECONNREFUSED 127.0.0.1:27017 -

mongodb://localhost:27017/{DATABASE_NAME}

MongooseServerSelectionError: connect ECONNREFUSED 127.0.0.1:27017 -

This happened probably because the MongoDB service isn't started. Follow the below steps to start it:

Go to Control Panel and click on Administrative Tools.
Double click on Services. A new window opens up.
Search MongoDB.exe. Right click on it and select Start.
The server will start. Now execute npm start again and the code might work this time.

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