Data & API utility tools online

Parse cron schedules, convert curl commands, build query strings, look up MIME types. Utility tools for API development that run in your browser.

// 6tools in this category

cron parser

translate schedules to english

curl converternew

convert curl to fetch, axios, python requests

query string parsernew

parse and build url query strings

mime lookupnew

find the right mime type for any file extension

chmod calculatornew

octal ↔ symbolic unix file permissions

url parsernew

break a url into components and rebuild

// about

These tools cover the utility tasks that come up constantly in API development and infrastructure work. Cron expression parsing turns cryptic schedules into plain English with next-run previews. The curl converter turns a DevTools-copied curl command into idiomatic fetch, Axios, or Python requests code in one click. The query string parser rounds out URL manipulation, and MIME lookup covers the Content-Type question that hits every file upload feature.

// common use cases

Parse a cron expression from a scheduler config to confirm the run time is correct
Convert a curl command copied from browser DevTools into a JavaScript fetch snippet
Debug a URL by splitting its query string into individual key-value pairs
Find the correct MIME type for a file extension before setting a Content-Type header

// faq

What cron syntaxes are supported?

The standard cron parser supports 5-field POSIX cron (minute, hour, day, month, weekday) with @yearly/@monthly/@weekly/@daily/@hourly shortcuts. For 6-field Quartz cron with seconds and L/W/# syntax, use the Quartz Cron tool in the Java category.

How many MIME types are in the lookup?

The lookup covers 500+ file types: all common image, video, audio, document, font, and application formats, plus many developer-specific extensions like .wasm, .jsonl, and .avif.

Does the curl converter handle authentication?

Yes. It parses -H "Authorization: ..." headers, -u user:pass basic auth, and bearer tokens, and includes them in the generated output for all supported languages.