MongooseError: o parâmetro `uri` para` openURI () `deve ser uma string, foi" indefinido ". Verifique se o primeiro parâmetro para `mongonOose.Connect ()` ou `Mongoose.createConnection ()` é uma string.

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

//If .env file is used in config folder, make sure the DB_STRING is associated with its
//value, which is the mongodb connection string from the cluster
//Next, install dotenv and require it in the app.js file:

require("dotenv").config({ path: "./config/.env" });
Depressed Dove