What is JSON Diff?
JSON Diff compares two JSON objects structurally and highlights differences in values, added keys, removed keys, and type changes. Unlike text diff, it understands JSON structure, so reordered keys won't show as different if values are the same.
Common Use Cases
API Testing
Compare expected vs actual API responses during testing.
Config Changes
Track changes in JSON configuration files.
Data Validation
Verify data transformations preserve or modify expected values.
Debugging
Find unexpected changes in JSON data structures.
How to Use This Tool
- Paste the original JSON in the left panel
- Paste the modified JSON in the right panel
- View structural differences highlighted
- See added, removed, and changed values
Guides & Tutorials
- How to Test JSON APIs Without Writing Code Format, validate, and read error bodies against RFC 9457 - no framework required.
- What is Regression Testing? Techniques + Checklist Prioritising a regression subset, and why a red build is not always a real failure.
Related Tools
Learn More
- RFC 6902 — JSON Patch The IETF specification for expressing JSON differences as patch operations.