Paste code in both editors to see differences
Hint: Paste original code on left, modified code on right, then click Compare to see differences highlighted.
Hint: Paste your code, customize font size and line numbers, then click Export PDF to download formatted code.
Hint: Paste your JWT token to decode and view its header, payload, and signature. The tool validates token structure and format.
Hint: Select conversion type, paste your data, and get instant conversion. Supports JSON, YAML, XML, Excel, PDF, and more.
Issue Description
Hint: Paste any code and click Format to beautify indentation, spacing, and structure instantly.
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More debugging helpers
How to format stack traces
Tame noisy debug output with four quick steps. This workflow keeps incident channels tidy and makes traces easier to share.
- Paste the trace - Copy the entire stack trace from logs, monitoring alerts, or your terminal.
- Pick formatter mode - Use the default layout or switch to another formatter preset in the sidebar.
- Click Format Trace - Line breaks, indentation, and duplicate frames are cleaned automatically.
- Share with your team - Copy the result into tickets, chat threads, or documentation without extra edits.
Use cases
Bug reports
Attach readable stack traces to tickets so engineers can see the failing frame instantly.
Incident response
Drop polished traces into Slack or Teams during an outage without overwhelming the channel.
Knowledge bases
Document common errors with consistently formatted traces for future reference.
Customer support
Clean traces provided by customers before routing them to engineering teams.
Readable stack traces for faster debugging
Raw stack traces often have inconsistent spacing, missing line breaks, and repeated frames that make them hard to scan. The Swapcode stack trace formatter restructures that output instantly so developers can see the root cause faster. Paste logs from production, staging, or local development and share them without manual cleanup.
Why format stack traces?
Clean traces improve collaboration. They reduce friction when pasting into Slack, Jira, Linear, Notion, or markdown docs because indentation remains intact. It also helps engineers focus on the actual frame that caused the failure instead of deciphering messy whitespace.
Key formatter features
The tool normalizes blank lines, aligns arrow indicators, collapses redundant frames, and keeps error messages prominent. Since everything happens client-side, it is safe for sensitive customer data or proprietary filenames.
- Works with Java, Python, Ruby, Go, PHP, and more
- Supports extremely long traces copied from log aggregators
- Pairs nicely with our code formatter and AI log analyzer
Best practices for error sharing
Always keep the original trace for auditing, but share the formatted version when collaborating. Highlight the most relevant frame, attach environment details, and link to related dashboards so teammates have full context.
Advanced workflows
Integrate the formatter into your debugging toolkit: reformat traces before posting them to status updates, combine with syntax highlighting for documentation, or export the cleaned output into markdown for incident retrospectives.
Frequently asked questions
What can I do with the stack trace formatter?
You can paste messy exception logs from any language and instantly reformat them with consistent spacing, indentation, and call hierarchy.
Is my stack trace uploaded to a server?
No. All processing happens in your browser, so sensitive log data never leaves your device.
Does the formatter work for all languages?
Yes. It focuses on whitespace cleanup, so Java, Python, JavaScript, Ruby, Go, and most other stack traces are supported.
Can I format very long traces?
You can paste thousands of lines. Extremely long traces may take an extra second but there are no imposed limits.
Does it modify file paths or variable values?
The formatter only touches whitespace, so file paths, messages, and line numbers stay intact for accurate debugging.