Tools we wished existed
JSON Toolkit started from a simple frustration: every JSON tool online was either slow, ad-ridden, or quietly uploading your data to a server you didn't choose.
Developers spend an absurd amount of time staring at JSON — debugging API responses, wrangling configuration files, comparing data between environments. The tools for that work should be instant, trustworthy, and a pleasure to use. Too often they're none of those things.
So we built JSON Toolkit: a complete suite of JSON tools that runs entirely in your browser. There is no backend. Nothing you paste is uploaded, logged, or stored anywhere. The moment the page loads, everything works offline — because all the processing happens on your machine.
Our principles
We hold ourselves to the standard of the products we admire — Vercel, Linear, Supabase, Postman. That means obsessive attention to speed, accessibility, and detail, paired with an uncompromising stance on privacy.
Privacy first
Your data never leaves your browser. Full stop.
Ruthlessly fast
No servers in the loop means no waiting.
Crafted, not cobbled
Every interaction is considered and polished.
Free, forever
No paywalls, no accounts, no dark patterns.
Stop pasting JSON into sketchy websites.
Open a tool and get to work in one click. No account, no upload, no tracking — just you and your data.