The error ECONNREFUSED is nothing but the connection have been refused. There is no process endpoint listening on local 127.0.0.1:27017
Before connecting to the database, make sure to install mongodb and start the database server.
From command prompt, go to where your mongo installations is situated and run command:
mongod --port 27017 --dbpath C:path_to_data_folder
You may find it useful Start MondoDB Process
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