Free tools
Developer Tools
Format JSON, generate UUIDs, decode JWTs, build cron expressions, and more. No signup, runs in your browser.
JSON Formatter & Validator
Format, validate, and minify JSON. Pick your indentation and catch syntax errors with line numbers.
UUID Generator
Generate UUIDs (v4, v7), ULIDs, and NanoIDs. Bulk generate up to 25 at once and copy with one click.
Timestamp Converter
Convert Unix timestamps to human-readable dates. Support for seconds, milliseconds, and multiple timezones.
JWT Decoder
Decode and inspect JSON Web Tokens. View header, payload, claims, and check expiration status.
Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 to text. Support for standard Base64 and URL-safe Base64URL.
Regex Tester
Test regular expressions as you type. See matches highlighted, view match details, and test replacements.
Cron Expression Builder
Build, validate, and understand cron schedules visually. See plain English explanations and preview next run times.