A toolkit for backend developers who got tired of clicking through ad-ridden, ten-year-old utility sites. Everything runs in your browser. Nothing is logged.
Validate, format, and minify JSON in milliseconds.
Decode and inspect JSON Web Tokens. Verify signatures.
Encode and decode Base64 strings, files, and images.
Percent-encode and decode URLs and query strings.
Build and explain cron expressions visually.
Generate UUID v1, v4, v7. Bulk export supported.
Test patterns with live matching and explanations.
Generate TS interfaces from any JSON payload.
Convert Unix timestamps to dates and back.
More tools shipping every week. Got a request? tell us.
You search for a JSON formatter. The first result has three banner ads, a cookie wall, a newsletter popup, and your data goes somewhere. The second has a paywall. The third hasn't been updated in five years.
CrunchAPI is the antidote: a single, fast, well-designed surface where every tool does its job and gets out of your way. Everything runs client-side. Your data never leaves the browser.
$ open source · static · no analytics by default