mongoose connect password must be string - mongodb

Question

This is my .env
DB_DATABASE="xyz_datatbase"
DB_USERNAME="xyz_user"
DB_PASSWORD="xyz_password"
In index.js i am using above env const but i am getting error password must be string even though it is string, i checked with typeof process.env.DB_PASSWORD and i get string
// config.db.url = mongodb://localhost/
mongoose.connect(config.db.url, {
useNewUrlParser: true,
useUnifiedTopology: true,
useCreateIndex: true,
useFindAndModify: false,
dbName: process.env.DB_DATABASE || '',
auth: {
user: process.env.DB_USERNAME || '',
pass: process.env.DB_PASSWORD || '',
},
});
Error in console
(node:28764) UnhandledPromiseRejectionWarning: MongooseServerSelectionError: password must be a string
at NativeConnection.Connection.openUri (D:\test\test-app-node-js\node_modules\mongoose\lib\connection.js:830:32)
at Mongoose.connect (D:\test\test-app-node-js\node_modules\mongoose\lib\index.js:335:15)
at Object.<anonymous> (D:\test\test-app-node-js\server\server.js:10:10)
at Module._compile (internal/modules/cjs/loader.js:778:30)

Answer 1

When you store data or env variables in .env file you should not enclose it in double-quotes, your codes should be like this,
DB_DATABASE=xyz_datatbase
DB_USERNAME=xyz_user
DB_PASSWORD=xyz_password

Answer 2

From the documentation
You can specify user and pass at the top level of options, like this
// config.db.url = mongodb://localhost/
mongoose.connect(config.db.url, {
useNewUrlParser: true,
useUnifiedTopology: true,
useCreateIndex: true,
useFindAndModify: false,
dbName: process.env.DB_DATABASE || '',
user: process.env.DB_USERNAME || '',
pass: process.env.DB_PASSWORD || '',
});