BestJson.Tools is a growing collection of free, privacy-friendly developer utilities built to make everyday data tasks faster and easier. No account required, no data stored — everything runs directly in your browser.
Your data never leaves your device. All tools on BestJson.Tools process data locally using JavaScript and Web Workers. Nothing is ever sent to a server.
Our Mission
We believe that great developer tools should be free, fast, and respect your privacy. BestJson.Tools was built to solve real problems — starting with JSON comparison — and we're expanding the toolkit over time. Every tool is designed with the same principles: no friction, no sign-ups, no data collection.
What's Available
JSON Compare
Compare two JSON documents side-by-side and instantly see what changed. Supports tree view, line diff, ignore array order, and export.
More Tools Coming
We're building more utilities for developers. Stay tuned for JSON formatter, validator, converter, and more.
Core Principles
Private by Design
Your JSON data is never sent to any server. Everything runs in your browser via Web Workers.
Fast
Instant results even with large, deeply nested JSON files — well over 50 MB.
Free Forever
No paywalls, no sign-ups, no usage limits. All tools are free to use.
JSON Compare — Feature Highlights
- Paste two JSON documents and see differences highlighted immediately
- Use Tree View to explore nested changes key by key
- Use Line Diff for a familiar side-by-side text comparison
- Ignore specific keys, paths, or patterns you don't want to compare
- Treat reordered arrays as equal with one toggle
- Export your diff as JSON, plain text, or Markdown
- Share a comparison via a permanent link — no login needed
- Validate your JSON against a JSON Schema
Get in Touch
Have feedback, found a bug, or have an idea for a new tool? We'd love to hear from you. Get in touch.