About SafeJSON
Our mission
SafeJSON exists because developer tools should not require trusting strangers with your data. Every time you paste an API response, a JWT token, or a configuration file into an online tool, you are making a security decision - whether you realize it or not.
We believe the safest tools are the ones that never see your data in the first place. Every SafeJSON feature runs entirely in your browser. No server processes your JSON. No data leaves your device. This is verifiable: open DevTools -> Network tab while using SafeJSON and you will see zero new requests.
Why SafeJSON was built
In November 2025, security researchers at watchTowr revealed that jsonformatter.org and codebeautify.org - two of the most popular online JSON tools - had been leaking user data for over five years. An unprotected feature exposed 80,000+ code snippets containing AWS access keys, GitHub personal access tokens, database passwords, and banking PII. Attackers were actively harvesting the data within 48 hours of the discovery.
Around the same time, the most popular JSON Formatter Chrome extension - with over 2 million users - was sold to a new owner. The extension was closed-sourced and injected with tracking scripts, checkout popups, and a hardcoded API key for harvesting user location data.
SafeJSON was built as a direct response: if all processing happens in the browser, there is nothing for a server to leak.
How it works
SafeJSON is a static web application built with Next.js and Tailwind CSS, deployed on Vercel. There is no backend server processing user data. All JSON formatting, validation, diff comparison, JWT decoding, JSONPath evaluation, and schema validation runs in client-side JavaScript using the browser's native capabilities.
The entire codebase is open source under the MIT license and available on GitHub. You can audit every line of code to verify these claims independently.
Built by an independent developer
SafeJSON is developed and maintained by a solo developer who builds privacy-first tools. The project is self-funded and independent - no venture capital, no external investors, no corporate parent company.
Being independent means we answer only to our users. There is no pressure to monetize through data collection, advertising, or tracking. The business model is straightforward: core tools are free forever, and Pro features are available through a paid subscription that is still 100% client-side.
Contact
For questions, feedback, or bug reports, open an issue on GitHub. For security-sensitive matters, refer to the repository's security policy.