Free Tools for Developers
Utility tools that don't phone home. Format JSON from an API response, test a regex before you commit it, decode a timestamp from logs, compare two minified bundles — all in your browser. No site sending your proprietary code to a third-party server to "process" it.
What Slows You Down
- Half the "free online tools" send your code/JSON/SQL to a server. For anything proprietary, that's a non-starter.
- Bookmark scatter: you have 30 different "one-trick" tool sites for JSON, regex, UUID, base64, timestamps, cron...
- IDE plugins cost money or rot — you want tools that work independent of your editor.
- On-call debugging: you need a clean web tool that works from a customer's locked-down machine when you're shoulder-surfing a bug.
Tools Built for Your Workflow
Pretty-print, validate, and inspect JSON — with syntax highlighting and collapsible nodes.
Generate TypeScript interfaces from a JSON sample in one paste.
Generate Zod schemas from JSON — runtime validation from example data.
Flatten nested JSON into key-path/value pairs for CSV export or debugging.
Alphabetize keys for cleaner diffs in PR reviews.
Live-test regex against sample strings. Shows captures and match positions.
Prettify JavaScript, HTML, CSS, and more in the browser.
Format one-line SQL from a log into readable queries.
Side-by-side diff of two code blocks. Useful before a commit when git is being weird.
Unix ↔ ISO 8601 ↔ human-readable. Multiple timezones at once.
Build cron expressions from natural language. See the next 5 run times.
Visualize a whole crontab file on a timeline.
Plain-text diff for config files, logs, and release notes.
Visual gradient builder → clean CSS output.
Build multi-layer box-shadows visually.
Paste unfamiliar code, get a plain-English explanation. Useful for onboarding to a new codebase.
Minify JS/CSS/HTML for quick bundle-size estimates.
Count tokens for OpenAI, Anthropic, Google model prompts — without calling an API.
Common Use Cases
Debug a webhook payload
JSON formatter to inspect → JSON to TypeScript to generate types → JSON to Zod to validate going forward.
Write a regex for log parsing
Regex tester with sample log lines. Get it right before you ship the log-parser change.
Decipher a legacy cron
Paste `0 */4 * * 1-5` into the crontab visualizer. See exactly when it runs for the next 30 days.
Check an LLM prompt's token count
Paste into the token counter. See costs by provider. Optimize before calling an expensive model.
Sanity-check a code change without git access
Paste the before/after into code diff. See exactly what changed when your local git is misbehaving.
Understand inherited code
Paste the mystery function into the code explainer. Get a plain-English summary before you touch it.
What You’d Otherwise Pay For
- Paid JSON formatter SaaS — $5–10/mo (free here)
- Regex101 Premium — $5/mo (free via our regex tester)
- Prettier Pro equivalents — free here
- Paid OCR/dev combo tools — free here
- Per-seat IDE extension licenses — free, no install
All of the above covered, free, in your browser. No subscription. No signup.
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Questions
Does my code get sent to your server?
No. Every developer tool processes locally in your browser. We don't see your JSON, regex patterns, SQL, or source code. You can run them offline after the page loads.
Are these tools as good as dedicated IDE plugins?
For what they do, yes. An IDE plugin has more context (your whole codebase). A browser tool is faster to reach for when you're debugging someone else's output or pasting from a log.
Do you support [my obscure format]?
We cover common ones (JSON, YAML, SQL, cron, regex, CSV). For niche formats (Avro, Protobuf, etc.), dedicated tools exist — we're not trying to cover every format.
Can I use these in an enterprise setting?
The Terms of Service apply to enterprise use. Browser-based with no data transmission generally fits most corporate security policies better than tools requiring uploads or accounts, but always check your company's approved-vendor list.
Is there an API?
No. These are browser-based utilities. For programmatic use, you want a local library (prettier, json5, etc.) — not a web tool.
Open Any Tool, Get to Work
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