Best way to capture error from database firebase javascript

Question

I have this code, but i don't know how capture a error.

  const coleccionRef = database.ref('test');
  coleccionRef.on('value', snapshot => {
    snapshot.val();
  });

Any idea?

Answer 1

If your client doesn't have permission to read from the reference, Firebase will invoke the (optional) second callback that you can pass in to on(). E.g.

const coleccionRef = database.ref('test');
coleccionRef.on('value', snapshot => {
  snapshot.val();
}, error => {
    console.error(error);
});

I recommend reading the Firebase reference documentation for finding more tidbits like this.