DevToolBox - Free Online Developer Tools

DevToolBox is a privacy-first collection of free online developer utilities that run entirely in your browser. No data is sent to our servers.

Available Tools

JSON Formatter - Format, validate, and beautify JSON with syntax highlighting, tree view, and table view
XML Viewer - Format and explore XML documents as interactive trees and tables
Code Diff - Compare two code snippets side-by-side with syntax highlighting powered by Monaco Editor
JSON ↔ YAML Converter - Convert between JSON and YAML formats bidirectionally for config files and APIs
URL Encoder/Decoder - Encode special characters for URLs or decode URL-encoded strings
UUID Generator - Generate universally unique identifiers for database keys and API tokens
Regex Tester - Test and debug regular expressions with real-time match highlighting
Cron Parser - Parse cron expressions into human-readable schedules
Password Generator - Create strong, cryptographically secure random passwords

Privacy Guaranteed

All processing happens locally in your browser using client-side JavaScript. We do not log, store, or transmit your inputs. Tools work offline after the first visit.