Developer Toolkit

Pretty-print or minify JSON with configurable indentation; parses strictly before it formats.

Check whether a string is valid JSON, report the root type, and return the parse error when it is not.

Encode UTF-8 text to Base64 or decode Base64 back to readable text, with whitespace stripped on decode.

Percent-encode or decode URI components so query values and path segments survive transport intact.

Generate up to 50 UUID v4 identifiers per call, or an approximate time-ordered v7 form, from crypto randomness.

Convert Unix seconds, milliseconds, or date strings into ISO 8601, epoch, and UTC representations.

Test a JavaScript regular expression against sample text and list matches, indexes, and capture groups.

Compose method, URL, headers, and body into copy-ready cURL and fetch snippets without sending the request.

Pretty-print CSS with Prettier for readable stylesheets, cleaner diffs, and easier specificity review.

Strip comments and whitespace from CSS and report original versus minified byte counts.

Convert a hex, rgb(a), or hsl(a) colour into all four notations at once, preserving alpha.

Build a five-field cron expression from schedule fields and preview the next five run times in UTC.

Parse a cron expression and list the next eight UTC run times so you can sanity-check a schedule.

Pretty-print HTML with Prettier so templates and response bodies become readable and reviewable.

Fetch a public URL and list every response header for CORS, caching, and content-type debugging.

Validate and classify IPv4 or IPv6 strings, including private and loopback ranges, with no external lookup.