mongoose.connect(), first argument should be String, received undefined

Question

I am trying to set the test database for the testing purpose, but its not working.

I am trying to connect to mongodb using mongoose, but finding problem in connection er

Answer 1

Since error message returned UNDEFINED uri parameter, .toString() will NOT work. You can use the String() function: String(your connection parameter).
Also, in if(env === 'test' || env === 'development') try not to use (===), it is a strict equality.

Instead try if(env == 'test' || env == 'development'). This is a loose equality. It doesn't care about the type match and will convert second operand's type to first one's type.