Angular 2+: A guide to retrieving error messages from Firebase

For my project, I've implemented Firebase as a simple backend solution. However, I've encountered an issue where Firebase expires my token after a short period of time. My goal is to detect this specific error and prompt the user to log in again.

The challenge lies in the fact that Firebase returns a unique object for error responses, and I need to access the error message property "Auth token is expired." I attempted the following approach, but it did not yield the desired result:

this.dataService.sendData(data)
  .subscribe(
    (response) => console.log(response),
    (error) => {
        if(error._body.error == "Auth token is expired"){
          //handle user re-login logic
        }
      }
  );

Answer №1

When referring to your scenario, you have the ability to check the status code.

const UNAUTHORIZED_TOKEN: number = 401;

this.userService.sendUserData(data)
  .subscribe(
    (response) => console.log(response),
    (error: any) => {
        if(error.status == UNAUTHORIZED_TOKEN){
          //prompt user to log in
        }
      }
  );

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