Errors

All Mongster errors inherit from MongsterError. The specialized classes let you handle failures at the right level without pattern-matching raw strings.

import { MongsterError, ValidationError } from "mongster";

try {
  throw new ValidationError("Email is required");
} catch (error) {
  if (error instanceof ValidationError) {
    console.error(error.message);
  }

  if (error instanceof MongsterError) {
    console.error(error.code, error.message);
  }
}

Error classes

When to catch what

• Catch ValidationError when you want to return a user-facing input error.
• Catch ConnectionError during startup and fail fast.
• Catch MongsterError when you want one fallback for every library-specific failure.