JSON DevTool & i18n Manager
Free & Open Source
JSON DevTool & i18n Manager
Your all-in-one toolkit for JSON manipulation, transformation, and translation file synchronization.
i18n Sync
Synchronize translation files instantly. Detect missing keys, merge updates, and keep all language files consistent.
Open i18n SyncTransform
Transform JSON with various operations: minify, beautify, flatten, unflatten, sort keys, and convert to TypeScript interfaces.
Open TransformDiff Viewer
Compare two JSON files visually. See additions, deletions, and changes highlighted with color-coded diff view.
Open Diff ViewerKey Compare
Deep audit i18n files: find missing keys, untranslated values, and placeholder mismatches.
Open Key CompareWhy JSON DevTool?
Fast & Efficient
All processing happens in your browser - no data sent to servers.
i18n Ready
Purpose-built for managing translation and localization files.
Developer Friendly
Built by developers, for developers. Clean UI with keyboard shortcuts.
Quick Start
1. i18n Sync: Paste your source (reference) locale file and target locale file. Click Sync to add missing keys and reorder.
2. Transform: Paste any JSON and choose from operations like minify, beautify, flatten, or convert to TypeScript.
3. Diff Viewer: Compare two JSON files side by side with visual highlighting of differences.