Getting an error cannot read properties of undefined in MongoDB Atlas

Question

so I'm new to MERN Stack and I'm trying to build a booking application wherein I'm using MongoDB Atlas for my database. I'm following a youtube tutorial to learn.

I am trying to connect my index.js file to .env file . I have used the connection string from mongodb atlas to connect but I keep getting this error.

TypeError: Cannot read properties of undefined (reading 'MONGO_URL') at Object. (C:\Users\Rashmika Satish\airbnbclone\api\index.js:20:29)
at Module._compile (node:internal/modules/cjs/loader:1254:14) at Module._extensions..js (node:internal/modules/cjs/loader:1308:10) at Module.load (node:internal/modules/cjs/loader:1117:32) at Module._load (node:internal/modules/cjs/loader:958:12) at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12) at node:internal/main/run_main_module:23:47

These are the respective files:

index.js file:

const express= require('express');
const cors = require('cors');
const mongoose = require('mongoose');
const bcrypt=require('bcryptjs');
const User=require('./models/User.js');
require('dotenv').config();

const app=express();

const bcryptSalt=bcrypt.genSalt(10);

app.use(express.json());
app.use(cors({ 
      credentials:true,
      origin:'http://localhost:5173',
}))


console.log(process.env)
mongoose.connect(process.ev.MONGO_URL);

app.get('/test', (req,res)=> {
res.json('test ok');
});

app.post('/register', (req,res)=>{
    const {name,email,password}=req.body;
res.json({name,email,password});


   
    
    
});


app.listen(4000);

This is the .env file

MONGO_URL=mongodb+srv://*********:<password>@cluster0.1isyt6d.mongodb.net/?retryWrites=true&w=majority

(hidden the username and pw on purpose)

Can you see correct env object after console.log(process.env)? It must be {MONGO_URL: xxx} — Dev Conductor
– Dev Conductor, Commented Aug 16, 2023 at 8:50
Now I'm getting an error like this: C:\Users\Rashmika Satish\node_modules\mongodb\lib\cmap\connection.js:202 callback(new error_1.MongoServerError(document)); ^ MongoServerError: bad auth : authentication failed — Rashmika Satish
– Rashmika Satish, Commented Aug 16, 2023 at 8:55
You made a mistake in code. Try change ev to env mongoose.connect(process.ev.MONGO_URL); to mongoose.connect(process.env.MONGO_URL); — Dev Conductor
– Dev Conductor, Commented Aug 16, 2023 at 9:11
What does this error mean? throw new MongoParseError('Invalid scheme, expected connection string to start with "mongodb://" or "mongodb+srv://"'); ^ — Rashmika Satish
– Rashmika Satish, Commented Aug 16, 2023 at 9:16

cantdocpp · Accepted Answer · 2023-08-16 08:48:33Z

0

change:

mongoose.connect(process.ev.MONGO_URL);

to:

mongoose.connect(process.env.MONGO_URL);

answered Aug 16, 2023 at 8:48

cantdocpp

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5 Comments

Rashmika Satish Over a year ago

Now I'm getting an error like this: C:\Users\Rashmika Satish\node_modules\mongodb\lib\cmap\connection.js:202 callback(new error_1.MongoServerError(document)); ^ MongoServerError: bad auth : authentication failed

cantdocpp Over a year ago

Well, you see the message yourself, it's wrong username or password. I see your .env that you didn't change the <password> there

Rashmika Satish Over a year ago

Thank you!! I solved it but i have another erro: throw new MongoParseError('Invalid scheme, expected connection string to start with "mongodb://" or "mongodb+srv://"'); ^

cantdocpp Over a year ago

well you can try to console.log(process.env.MONGO_URL) and see if it's start with mongodb:// or mongodb+srv:// or not

Rashmika Satish Over a year ago

I cannot cast an upvote since I don't have enough reputation points

vmank · Accepted Answer · 2023-08-16 08:52:19Z

0

There seems to be a syntactical error on line 20, process.ev.MONGO_URL should be process.env.MONGO_URL.

edited Aug 16, 2023 at 8:52

answered Aug 16, 2023 at 8:46

vmank

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5 Comments

Rashmika Satish Over a year ago

Now I'm getting an error like this: C:\Users\Rashmika Satish\node_modules\mongodb\lib\cmap\connection.js:202 callback(new error_1.MongoServerError(document)); ^ MongoServerError: bad auth : authentication failed

vmank Over a year ago

Now it tries to connect but it fails due to credentials being faulty. You need to edit the env variable MONGO_URL and pass in the correct credentials.

Rashmika Satish Over a year ago

Oh the username and password is corrected but i got this error: throw new MongoParseError('Invalid scheme, expected connection string to start with "mongodb://" or "mongodb+srv://"'); ^

vmank Over a year ago

Something is wrong with the url scheme, try replacing the mongodb+srv:// in MONGO_URL with mongodb:// to see if it makes any difference.

vmank Over a year ago

@RashmikaSatish Also try enclosing your env var in double quotes like this, MONGO_URL="mongodb+srv://*********:<password>@cluster0.1isyt6d.mongodb.net/?retryWrites=true&w=majority". Refer to this SO Question for more details.

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