All JSON Tools
A complete suite of free, browser-based JSON utilities. Every tool runs entirely on your device — nothing is ever uploaded to a server.
JSON Viewer
Explore and edit JSON data with an interactive tree view and synchronized text editor. Features inline editing, real-time search, path explorer, and comprehensive statistics. Supports large files with no UI freezes.
- Tree & Text Views
- Inline Editing
- Real-time Search
- Statistics
JSON Formatter
Beautify and pretty-print minified JSON with proper indentation, line breaks, and consistent spacing. Compare input vs output character counts and file sizes. Also supports minification.
- Pretty-Print
- Minify
- Size Comparison
- Drag & Drop
JSON Minifier
Compress JSON by removing all whitespace, reducing file size for production use. See exact percentage saved and compare original vs minified size. Also supports formatting.
- Whitespace Removal
- % Savings
- Size Comparison
- Format Option
JSON Diff Tool
Compare two JSON payloads side by side with color-coded line highlighting. Uses LCS diff algorithm to show additions, removals, and unchanged lines. Copy results from either side.
- Side-by-Side
- Color-Coded
- LCS Algorithm
- Swap Sides
JSON Validator
Validate JSON and pinpoint syntax errors with detailed error messages, line and column numbers, human-friendly explanations, and fix suggestions. See statistics on valid JSON including object counts, array lengths, key/value totals, and file size.
- Syntax Checking
- Error Details
- Fix Suggestions
- Statistics
Why Use Pretty JSON Viewer Tools?
100% Private
All processing happens in your browser. Your data never touches a server. No uploads, no tracking, no storage.
Completely Free
Every feature is free. No sign-ups, no subscriptions, no paywalls, no ads. Just tools that work.
Works Offline
Once loaded, most tools work without an internet connection. The entire app runs client-side via JavaScript.