Developer utilities that run entirely in your browser.

Beautify, minify and validate JSON with exact line and column numbers on every parse error.

Split a JSON Web Token into header, payload and signature, with expiry shown in local time.

UTF-8-safe encode and decode for text and files, including Data URI output with size readout.

MD5, SHA-1, SHA-256, SHA-384 and SHA-512 digests computed locally from text or a file.

Percent-encode strings and parse query strings into a readable table of keys and values.

Generate v4 and time-ordered v7 identifiers in bulk, with casing and separator options.

Convert between epoch seconds or milliseconds and local or UTC calendar dates.

Translate five-field cron expressions into plain language and list the next five run times.

Resolve a CIDR block into network, broadcast, host range, mask and private-range status.

Move between HEX, RGB and HSL and check any pair against the WCAG AA and AAA thresholds.

Encode and decode reserved HTML characters as named or numeric entities, with a reference table.

Parse semantic versions, compare precedence and test range expressions like ^1.2.0.