Developer tools that never phone home
Convert data formats, decode JWTs, build cron schedules, test regex and format SQL. Everything runs in your browser, so your data stays on your machine.
Tools
Pick a tool and paste freely. Nothing leaves this tab.
JSON to TypeScript
Generate interfaces or types from any JSON sample.
Open toolCron Expression Builder
Build, explain and preview cron schedules.
Open toolJWT Decoder
Inspect token headers, claims and expiry.
Open toolRegex Tester
Live match highlighting, groups and replace.
Open toolSQL Formatter
Pretty-print queries for 7 SQL dialects.
Open toolFormat Converter
Convert between JSON, YAML, CSV, XML, TOML in any direction.
Start converting
Format converters
Every combination of 5 formats, each with its own page.
Why it’s private
Nothing is uploaded
Every tool is plain JavaScript running on your device. There is no API that receives your input.
No account, no tracking of inputs
Open a page and start working. What you paste is never stored, logged or analysed.
Instant results
Output updates as you type, with no network round trip, even on a slow connection.
Safe for sensitive data
Tokens, customer exports and internal configs stay in your browser tab and disappear when you close it.