Free Developer Tools
JSON, Base64, URL, hashing, JWT, UUID, timestamps and case conversion — the little utilities you reach for all day. Everything runs locally in your browser: nothing you paste is ever uploaded.
JSON
Input
Output
100% private — your data never leaves this page. No upload, no account. That's the whole point.
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How to use it
- Pick a tool — JSON formatter, Base64, URL codec, hashing, JWT decode, UUID, timestamps or case conversion.
- Paste your input; the output appears instantly, all computed locally in the page.
- Copy the result with one click. No server round-trips, nothing logged.
Want all these tools offline, in one keyboard-driven app?
The Wrangle desktop app bundles every tool in this demo plus diff, JSON↔YAML↔CSV, cron parsing, regex tester, colour tools, hex/base converters and more — all offline, so you never paste an API key or a JWT into a random website again. $15 once, own it forever. MIT-licensed source included.