Developer tools that never phone home
Format JSON, diff it, convert YAML, decode a JWT, read a cron schedule, test a regex. The same tools you already use — without the adverts, the trackers, or a stranger’s server reading your data.
JSON formatter
Format, minify and validate — with errors that name the line.
OpenText to array
Turn a list of lines into a JSON array, SQL list or CSV row.
OpenJWT decoder
Read the claims, check the expiry, verify the signature locally.
OpenJSON diff
Compare two documents by structure, not by line.
OpenYAML ↔ JSON
Convert either way, with the ambiguous bits flagged.
OpenCron explainer
Read a schedule in English and see when it next fires.
OpenRegex tester
Match, capture and replace — without freezing the tab.
OpenIt cannot phone home
There is no server, no API and no analytics. The page also ships a Content-Security-Policy of connect-src 'self', so the browser itself blocks any request to another origin — this is enforced, not just promised.
Your token is a live credential
A JWT you are debugging usually carries your user id, your email and a signature that works until it expires. Pasting one into an ad-funded site hands a stranger a working key. Here it never leaves the tab.
Nothing is remembered
No accounts, no cookies, no local storage, and nothing in the URL — so there is no share link that could leak a token. Close the tab and it is all gone.
How it works
Three simple steps. Everything runs as plain JavaScript inside your browser, so what you paste never touches the internet.
- 01
Pick a tool
Seven tools, each doing one job properly. No sign-up, no rate limit, and no advert covering the output.
- 02
Paste it in
Paste your text, or drop a file onto the editor. It is parsed by JavaScript running in this tab, on your machine.
- 03
Copy the result
Take the formatted output and carry on. Nothing was transmitted, logged or stored along the way.