crashlens
Logs tell you where your program was. crashlens tells you why it died.
Runs in your browser · open source on GitHub
Live demo: the sample bugs below are real crashlens reports. Paste your own Python, Java, Node, Go or Rust stack trace, or an ASan report: it is analyzed right here in your browser and never uploaded. Get crashlens for core dumps, your source code and live log watching.

What crashed?

Drop or paste any of these and crashlens explains where it failed and why, pointing at your code first.

  • Go / Rust panics
  • Python tracebacks
  • Java stack traces
  • Node.js errors
  • ASan / UBSan reports
  • Linux core dumps + binary

Logs printed before the failure are shown too, so you can see which request or order triggered it. The same bug from many files is grouped together.