TypeError: Cannot read property 'startsWith' of undefined

Hi, im trying to connect to MongoAtlas run an app that uses mongodb (^4.3.1 ) in nodejs (version 10.19.0), Windows 7 & then i have this error:

 TypeError: Cannot read property 'startsWith' of undefined:
    return (connectionString.startsWith('mongodb://') ||
TypeError: Cannot read property 'startsWith' of undefined
    at connectionStringHasValidScheme (D:\codespace\zzz\node_modules\mongodb-connection-string-url\lib\index.js:9:30)

Could anybody shed me some light on how to clear this error? please?
Thanks :slight_smile:

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@aphong what do you actually intend to do? Set up a connection with your database? or is it something else? Can you please share your code as well?

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Hey! Bro, I just want to get infor from an API then save it into a database.
I have just figured it out the issue. It s weird that the file containing MongoDB connection does not read the .env file where I put the connection string inside & call it by this variable process.env.MOGNGO_CONNECTION_STRING despite that i have installed “dotenv” package & called this line require(“dotenv”).config();
Anyway! thank you so much bro! :slight_smile:

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I will get back to you regarding this issue, until then feel free to use the following method:

To establish a reusable connection (So that we can access the connected database from any other file), I created an async function in my db.js file where the connection is established and then exported it. In the end of the file, I have called the function. The code is as follows:

const {MongoClient} = require('mongodb')

const client = new MongoClient('mongodb+srv://todoAppUser:<password>@cluster0.6lvjr.mongodb.net/myDatabase?retryWrites=true&w=majority')

async function start(){
  await client.connect()
  module.exports = client.db()
  const app = require('./app')


and while calling it from another file:

const productCollection = require('./db').collection("product");

This code gives me no error and works perfectly fine. With the help of the above code, one can use this conveniently while following the MVC (Model-View-Controller) framework.

I hope this helps you until I get back to you with the .env solution.



thanks for your great code snippet. I got it!
Its just weird with the .env file. I put the .env file in the same directory with package.json & src folder. then I ve got index.js & bd.js where I call the mongodb connection inside the src folder.

├── src/ (… ,db.js , index.js)
├── node_modules
├── .env
└── package.json
Then the error appears when i try to run node index.js inside src folder.
if I replace the process.env.MOGNGO_CONNECTION_STRING variable by this url string ‘mongodb+srv://todoAppUser:@cluster0.6lvjr.mongodb.net/’ inside db.js file then the error is gone! :neutral_face:

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Do you mind sharing the code inside your .env, index.js and db.js files? It would be easier for me to help you! :slightly_smiling_face:

i just put the .env file inside src … and it works :face_with_hand_over_mouth:

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Awesome! Happy to hear that!
Happy coding :v:

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Thank you so much fo your time Kush! nothing much just my dumb scritps hihi :smiling_face:
happy coding!

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In my case I believe the issue was caused happening because of a small delay before the .env gets initiated.
If i call new MongoClient at the top of the module it fails, but if I call new MongoClient inside on a function I don’t get the issue.

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