Developer Tools
JSON, JWT, Base64, UUID, regex, cron, and more — all running locally in your browser. 10 tools available.
- JSON Formatter
JSON Formatter
Beautify, minify, and validate JSON with customizable indentation.
OpenDeveloper Tools - JSON Validator
JSON Validator
Check JSON syntax instantly with line and column error positions.
OpenDeveloper Tools - JSON Minifier
JSON Minifier
Remove whitespace from JSON to reduce file size with byte savings report.
OpenDeveloper Tools - JWT Decoder
JWT Decoder
Decode JWT tokens locally. View header, payload, and expiry status.
OpenDeveloper Tools - Base64 Encoder/Decoder
Base64 Encoder/Decoder
Encode and decode Base64 and Base64URL with full Unicode support.
OpenDeveloper Tools - UUID Generator
UUID Generator
Generate cryptographically secure UUID v4 identifiers in bulk.
OpenDeveloper Tools - Cron Expression Generator
Cron Expression Generator
Build, validate, and humanize standard 5-field Unix cron expressions.
OpenDeveloper Tools - Unix Timestamp Converter
Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa.
OpenDeveloper Tools - URL Encoder/Decoder
URL Encoder/Decoder
Encode and decode URL components and full URIs with reserved char reference.
OpenDeveloper Tools - Regex Tester
Regex Tester
Test JavaScript regular expressions with live match highlighting and groups.
OpenDeveloper Tools