logging-error-handling.md

Logging & Error Handling

Add logging functionality to already existing REST service.

1. Add logger which will log incoming requests to service (at least url, query parameters, body) and response status code.
2. Add logger which will log all unhandled errors and return a standard message with HTTP code 500 (Internal Server Error).
3. Add listener and logging to uncaughtException.
4. Add listener and logging to unhandledRejection.
5. Writing to process.stdout or to a file both can be used for logging. Any third-party logging library can also be used for this purpose.
6. Create multiple logging levels and store logging level in environment variable.