3 free tools
Web & Developer Tools
Browser-based utilities for developers — format and validate JSON, test regular expressions, generate UUIDs and more. No uploads, no accounts, instant results, and many keep working offline.
★ Featured
JSON Formatter & Validator
Beautify, validate and minify JSON with clear error messages.
Web & DeveloperRegex Tester
Test regular expressions against sample text with live matches.
Web & DeveloperUUID Generator
Generate RFC-4122 v4 UUIDs in bulk, ready to copy.
Web & DeveloperFrequently asked questions
Are these developer tools free? +
Yes — all of them are free to use, with no sign-up required.
Do they work offline? +
Once the page has loaded, most developer tools keep working without a connection — everything runs client-side.