Make sure the first parameter to `mongoose.connect()` is a string - node.js

Question

I'm trying to connect MongoDB Atlas to my application and ran into this error when trying to run the mongoose.connect(), which is located in db.js (last code in the question). process.env.MONGO_URI seems to be interpreted as undefined and not string, giving the following error: "MongooseError: The uri parameter to openUri() must be a string, got "undefined". Make sure the first parameter to mongoose.connect() or mongoose.createConnection() is a string."
this is the my config.env, in which I copy pasted the MONGO_URI from the Atlas.
MONGO_URI = mongodb+srv://kpae:XXXX#practice.xujsvaf.mongodb.net/?retryWrites=true&w=majority
this is app.js, where I believe I set up the basics to run the program.
const express = require('express')
const dotenv = require('dotenv')
const connectDB = require('./config/db')
dotenv.config({ path: '.config/config.env' })
connectDB()
const app = express()
const PORT = process.env.PORT || 5000
app.listen(
PORT,
console.log(`Server running in ${process.env.NODE_ENV} mode on port ${PORT}`)
)
this is db.js
const mongoose = require('mongoose')
const connectDB = async () => {
try {
const conn = await mongoose.connect(process.env.MONGO_URI, {
useNewUrlParser: true,
useUnifiedTopology: true,
useFindAndModify: false
})
console.log(`MongoDB Connected: ${conn.connection.host}`)
} catch (err) {
//console.log('this is an error')
console.error(err)
process.exit(1)
}
}
module.exports = connectDB
I'm having trouble pinpointing where the bug lies in my code because it seems like my files are in the root folder and MONGO_URI looks like a string. Any help is appreciated.

Answer 1

Can you please try once like this in your env file?
MONGO_URI='mongodb+srv://kpae:XXXX#practice.xujsvaf.mongodb.net/?retryWrites=true&w=majority'