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MONGO_URI in .env not working when deploying in heroku

I'm trying to deploy an app on heroku but i can't if i use dotenv. This code doesn't work:

mongoose.connect(process.env.MONGO_URI, { useNewUrlParser: true }, () => {
  console.log("Connected to db successfully");
});

But this does:

mongoose.connect("mongodb+srv://test:test@cluster0.j0you.mongodb.net/ecommerce?retryWrites=true&w=majority", { useNewUrlParser: true }, () => {
  console.log("Connected to db successfully");
});

When i try to use dotenv heroku throws this 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.

about 4 years ago · Juan Pablo Isaza

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Answer 1 · 2022-07-11T12:47:33.516Z

I had to go to heroku dashboard> settings> config vars and then add the key as MONGO_URI and the mongo url value that mongodb gave me

Answer 2 · 2022-07-11T12:47:33.522Z

You need to make sure of two things

go to heroku dashboard> settings> config vars and then add the key as MONGO_URI and the mongo url value that mongodb gave me... this info is in the .env file of your project. you might have with another name like DATA_BASE_MONGO just make sure to use that name and key in the config vars.
Heroku dynamically assigns your app a port, so you can't set the port to a fixed number. Heroku adds the port to the env, so you can pull it from there. Switch your listen to this: .listen(process.env.PORT || 5000), probably yo have it like .listen(5000), just make sure to change it. And thats`s it you will have your app running.

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MONGO_URI in .env not working when deploying in heroku

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Andres GPT