About Developer Tools
A suite of fast, browser-based developer utilities. Format and validate JSON, encode/decode Base64, and inspect JWT tokens — all 100% client-side with no data ever leaving your device.
What's Included
- 100% browser-based — no data ever sent to any server
- JSON Formatter with syntax highlighting and error detection
- Base64 encoder and decoder for text and binary data
- JWT decoder with header, payload, and signature breakdown
- Instant results with no page reloads or sign-ups
- Works offline once the page is loaded
Frequently Asked Questions
Are these developer tools free to use?
Yes. All tools in the Developer Tools suite are completely free with no usage limits, no account required, and no hidden charges.
Is my data safe? Does it get sent to your servers?
Your data never leaves your browser. All processing happens entirely client-side using JavaScript. We do not log, store, or transmit any input you provide.
Do these tools work offline?
Yes. Once the page has loaded, all three tools (JSON Formatter, Base64, JWT Decoder) work without an internet connection.
Can I use these tools on mobile?
Yes. All tools are fully responsive and work on any modern smartphone or tablet browser.