Install and Set up Mongoose problems

Install and Set up Mongoose problems

I’m getting the mongoose is not connected message on running the test.
Mongodb and mongoose dependencies are okay.

Relevant code :
in the . env :
MONGO_URI=mongodb://:@ds123790.mlab.com:23790/yakdatabase

in myapp.js:
var mongoose = require(“mongoose”);
mongoose.connect(process.env.MONGO_URI);

in package.json :
“dependencies”: {
“express”: “^4.12.4”,
“body-parser”: “^1.15.2”,
“mongodb”: “^3.6.6”,
“mongoose”: “^5.1.6”
},

Help appreciated. username and password to connect to mLab seem okay. Any quick way to validate this ?