How do I handle if the api error message is undefined?-CodePudding

If the login is successful, I do not receive an error message. My problem is that if no error message is received, the value of data.error.message is undefined and the program crashes. How can I solve this?

 if(data.error.message === 'EMAIL_NOT_FOUND'){
      setError({
        title: "EMAIL_NOT_FOUND",
        message: "This email address is not registered.",
      });
      setIsLoading(false);
      return;
    }

    if(data.error.message === 'EMAIL_NOT_FOUND' && data.error.message !== undefined){
      setError({
        title: "EMAIL_NOT_FOUND",
        message: "This email address is not registered.",
      });
      setIsLoading(false);
      return;
    }

I tried this too but same error.

CodePudding user response：

Probably you getting error because you are trying to read from object that is undefined.

You can make modify your condition to handle case when error is undefined:

 if(data?.error?.message && data.error.message === 'EMAIL_NOT_FOUND'){
   ...
 }

That way you will make sure that error and message exist and not undefined.