Can i connect to mongodb from my express app hosted on firebase dynamic hosting?

Question

I am trying to connect to mongodb from my express app hosted on firebase dynamic hosting. I simply created an endpoint to save a data on mongodb. This endpoint can be called from localhost(works fine) but fails to load the page on firebase deploy(Error: could not handle the request)

const chris = new User({
    name: 'john',
    username: `test`,
    password: `${Date.now()}` 
  });

app.get('/user', (request, response) => {
      chris.save( (err) => {
        if(err) {
            response.send(`error occured`);
        }
        response.send(`${Date.now()}`);
    });
});

Answer 1

The issue is that there is a restriction to use network calls (Third party service calls) in the free plan. **Answer found in Cloud Functions for Firebase - Billing account not configured**d

The restriction is about outbound access - e.g. can your Function request resources from the general internet. Its absolutely fine to use a function to respond to a webhook, or to access Google-internal services such a the Realtime Database.

If you wanted to call a third party web service (for example) you'd need to enable billing.

For the other quotas, take a look at: https://firebase.google.com/pricing/ - as you can see there are limits to the number of invocations (125,000 at time of writing) and CPU and memory (40k cpu-seconds and 40k GB-seconds) in the free tier.