Error Handling & Input Validation
Unhandled exception
Last updated: 4 Mar 2026
Definition
An exception is not caught or translated, often crashing the request/process.
How to fix Unhandled exception?
Add scoped and top-level handlers; convert to domain errors; avoid leaking sensitive details; add fail-safe fallbacks
Symptoms
Observable signs that may indicate Unhandled exception:
- Process or request crashes without graceful fallback.
- 500 errors with stack traces exposed.
- Background jobs halt on first error.
Example Errors:
- Unhandled exception: NullReferenceException
- Fatal error: uncaught exception
- Node process exited with code 1