Stack Trace Formatter

Paste a raw stack trace from any runtime — Node.js, Python, Java, .NET, Go, Rust, PHP, or Ruby — and get a structured, colour-coded frame breakdown with file, function, and line details.

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Parsed frames will appear here.

Parses Node.js, Python, Java, .NET, Go, Rust, PHP, and Ruby stack traces. Supports multi-exception traces. Upload a matching .js.map file to resolve a minified stack trace's original file/line/function names via source-map symbolication.

Resolve minified stack trace with a source map

Stack Trace Formatter

Paste a raw stack trace from any runtime — Node.js, Python, Java, .NET, Go, Rust, PHP, or Ruby — and get a structured, colour-coded frame breakdown with file, function, and line details.

Common uses

  • Parse a Node.js TypeError stack trace
  • Format a Python traceback
  • Inspect a Java NullPointerException

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Frequently asked questions

How do I make a stack trace readable?

Paste the raw trace into the Stack Trace Formatter to get a structured breakdown of each frame with file, function and line, with an option to hide internal frames.

Which languages are supported?

Node.js, Python, Java, .NET, Go, Rust, PHP and Ruby traces.

Do I need to say which language the trace is from?

No, the language is auto-detected, though you can pick one manually if detection guesses wrong.

Can I decode a minified JavaScript stack trace?

Yes, upload the .js.map source map and the tool resolves the positions back to the original files and lines.

Is my data uploaded to a server?

No. This tool runs entirely in your browser — your input is processed locally on your device and is never uploaded or stored on a server.