Zeddy Errors

Zeddy Errors is a simple base class for custom errors/exceptions focused on proper TypeScript typings. There are no differences between errors and exception classes except that errors have by default http status code 500 and exceptions 400.

This library closely follows suggestions written in my upcoming book 'Pragmatic Node.js development: Primer in NestJS'. In short make descriptive error names so the error.message is not needed, and pass additional data to further enrich the error for logging.

Usage

Make a new file which export error definitions as in sample below. Recommended is to have one SharedErrors and one for each part of your application ie. AuthErrors, CacheErrors, UserErrors...

In generic argument you can put the type of data that error will contain.

export const SharedErrors = {
  EntityNotFound: class extends ExceptionBase<{ type: string; id: number }> {},
  JwtTokenMissingBearer: class extends ExceptionBase{},
  IntentionalError: class extends ErrorBase<{ reason: string }> {},
};

You can throw the errors with:

import {SharedErrors} from './app.errors';
//...
throw new SharedErrors.IntentionalError({reason: "Testing errors"});
throw new SharedErrors.JwtTokenMissingBearer();

Example project

Example project can be found on https://github.com/zveljkovic/zeddy-errors-example.