Why code analysis matters
Quick, client-side analysis gives you instant visibility into complexity signals: comment density, token repetition, and size. It helps reviewers spot brittle areas, duplicated logic, or missing documentation before code reaches CI. Because it runs in your browser, you can inspect proprietary snippets safely, without pushing them to external services.
For architecture reviews, pair programming, or incident response, having fast metrics accelerates decisions. Developers can prioritize refactors, compare module sizes, or attach metrics to change tickets without leaving the browser.
How to use the Code Analyzer
- Paste or type code, or upload a file (.js, .ts, .py, .json, .yaml, .html, .sql, .txt).
- Click Analyze Code to compute metrics locally.
- Review language detection, lines, comments, size, token frequency, and estimated read time.
- Use Copy Summary for quick notes or Download CSV for documentation.
- Clear when you want a fresh run and repeat as needed.
Tips for better code quality
- Keep functions small and focused; high token repetition can hint at duplication.
- Maintain healthy comment density, especially around business logic and edge cases.
- Watch file size in client bundles; large modules may belong behind code splitting.
- Align naming: frequent tokens should reflect clear domain concepts.
- Pair metrics with tests—use insights here to target areas needing coverage.
Performance and safety considerations
All analysis is offline and instant. That keeps source code private while providing metrics useful for PR descriptions, runbooks, and incident postmortems. Combine these insights with static analysis or linters in CI for deeper checks.
When sharing metrics, avoid pasting sensitive code in tickets; instead, attach summaries or CSV exports. If you need language-specific parsing, add linters in your repo while this tool handles fast pre-checks.
For more best practices, see the Code Review guidance and Mozilla's secure coding guidelines.
Frequently Asked Questions
What does this code analyzer do?
It inspects your pasted code to estimate language, count lines, characters, words, comment density, top tokens, and reading time—without sending data to a server.
Is my code uploaded anywhere?
No. Everything runs locally in your browser. Your snippets never leave your device, making it safe for private or proprietary code.
Which languages are detected?
Lightweight heuristics cover common languages (JS/TS, Python, SQL, HTML, CSS, JSON, YAML). When uncertain, it falls back to Plain Text.
Can I upload files?
Yes. Use the upload button to load a file (txt, js, ts, py, json, yaml, html). The analyzer runs instantly in-browser.
Does it modify my code?
No. It only reads and reports metrics. You can copy the summary or download results as CSV for documentation or reviews.