Mongodb: failed to connect to server on first connect

To connect to mongodb with mongoose, you can use :

mongoose.connect('mongodb://localhost/users_test');

or

mongoose.connect('localhost/users_test');

or

mongoose.connect('localhost','users_test');

But not mongoose.connect('mongodb:localhost/users_test');, it doesnt match the right hostname (mongodb instead of localhost)

Adding one more answer as the solution is from different contexts:

MongoDb Atlas problem solution

I connected to MongoDB Atlas and whitelisted my machine's IP by following the below steps:

• Go to the security tab

• Go to the network access tab under the security tab

• Go to the IP whitelist tab

• Enter the IP address of your machine

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