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SafeJSON — Privacy
A JSON formatter that never sees your data
SafeJSON is a privacy-first JSON toolkit for developers. Format, validate, diff JSON and decode JWT tokens — all 100% client-side. Your sensitive data never leaves your browser, no uploads, no tracking. Built after jsonformatter.org leaked 80,000+ user credentials in 2025. Open source & free forever for core formatting features.
Hey Product Hunt! I'm the solo developer behind SafeJSON.
I built this after the jsonformatter.org breach in November 2025 — security researchers found over 80,000 credentials
(AWS keys, GitHub tokens, banking details) publicly exposed through an unprotected feature. The root cause:
server-side processing.
SafeJSON does everything in your browser. Open DevTools → Network tab while using it — zero requests. Your data
literally never leaves your device.
What's included:
- JSON Formatter & Validator (free forever)
- JSON Diff — side-by-side comparison with color-coded changes
- JWT Decoder — decode tokens without sending them to a server
- JSONPath Query & Schema Validator
- Browser extension (Edge Add-ons)
Built with Next.js + Tailwind. MIT licensed. Entire codebase on GitHub.
I'd love feedback on what to build next. What's the one JSON-related task you do manually that you wish was automated?
About SafeJSON — Privacy on Product Hunt
“ A JSON formatter that never sees your data ”
SafeJSON — Privacy was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #136 on the daily leaderboard. SafeJSON is a privacy-first JSON toolkit for developers. Format, validate, diff JSON and decode JWT tokens — all 100% client-side. Your sensitive data never leaves your browser, no uploads, no tracking. Built after jsonformatter.org leaked 80,000+ user credentials in 2025. Open source & free forever for core formatting features.
On the analytics side, SafeJSON — Privacy competes within Open Source, Privacy, Developer Tools and GitHub — topics that collectively have 634.9k followers on Product Hunt. The dashboard above tracks how SafeJSON — Privacy performed against the three products that launched closest to it on the same day.
Who hunted SafeJSON — Privacy?
SafeJSON — Privacy was hunted by JSON-Lee. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of SafeJSON — Privacy including community comment highlights and product details, visit the product overview.
JSON-Lee