About JSON Tools
Why this site exists, how it works, and who built it.
Why it exists
Most online "JSON formatter" or "converter" sites are cluttered with intrusive ads, force a signup, or quietly send whatever you paste to a server. JSON Tools started as a personal itch: a place to format JSON, decode a JWT, or convert a CSV without any of that friction.
How it works
Every tool runs entirely in your browser. When you paste JSON, a JWT, or a CSV file into any tool, it is processed by client-side JavaScript and never transmitted anywhere. There is no backend that sees your data. The site is a static export with no server-side processing.
Free, no account, no catch
All 38 tools and 32 guides are free, with no usage limits and no premium tier. The site is funded by non-intrusive ads shown only with your consent. There is no plan to add a paywall or gate any tool behind a signup.
Who built it
JSON Tools is built and maintained by flex-57, an independent developer. The project is open source, and the code, issues, and history are all public on GitHub.
Get in touch
Found a bug, have a feature request, or just want to say hi? Get in touch →