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

I came across this same issue and here is my fix: the process.env.MONGODB_URL should be in a string. Check it out

const mongoose = require('mongoose');


mongoose.Promise = global.Promise;
mongoose.connect('process.env.MONGODB_URI', err => {
    if(err) 
        console.log(err);
    } 
);



module.exports = {
    mongoose
};

Answer 2

my .env file was named .dotenv by mistake. after changing it to .env everything worked

Answer 3

I ran into the same problem. 1. I saved my ATLAS_URI ID to a file called .env 2. My .env file was in the wrong directory, that's how the problem cause 3. Solution: I used "ls -a" command to make sure my .env file is in the same location as my server

Answer 4

I was also facing same problem after add code { useNewUrlParser: true } in mongoose.connect() method. Problem resolved.

mongoose.connect(config.DB,{ useNewUrlParser: true }));

Answer 5

Make sure that you have the .env file with the constants that you are using defined.

Answer 6

This is what solved my problem. Happy Coding!

// Connect to MongoDB
    mongoose.connect('mongodb://yourusername:yourpassword@ds121825.mlab.com:11025/yourmongodb', {useNewUrlParser: true});
    mongoose.connection.once('open', function(){
      console.log('Conection has been made!');
    }).on('error', function(error){
        console.log('Error is: ', error);
    });