Time-Travel Debugging: Replaying Production Bugs Locally

Hacker News

February 25, 2026

We’ve all had that sinking feeling. There are multiple crash reports from production. We have the exact input parameters that caused the failures. We have the stack traces. Yet, when we run the code locally, it works perfectly. If we could simply rewind time and watch the code execute exactly as it did for those failed requests, life would be a lot easier…