Angular Error

   errorHandler

    (error: any) {

    let errorMessage = '';

    if (error.error instanceof ErrorEvent) {

      errorMessage = error.error.message;

    } else {

      // Get server-side error

      switch (error.status) {

        case 400:

          alert("something went wrong, " + error.error.errorMessage);

          break;

        case 404:

          alert("something went wrong," + error.error.errorMessage);

          break;

        case (!error.ok):

          alert("something went wrong while connecting server")

      }

      errorMessage = `Error Code: ${error.status}\nMessage: ${error.message}`;

    }

    console.log(errorMessage);

    return throwError(errorMessage);

  }

}