JSON Diff Tool — Compare JSON Side by Side
Compare two JSON objects and instantly see what was added, removed, or changed. Free, 100% client-side — your data never leaves your browser.
JSON A (Original)
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JSON B (Modified)
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When to Use a JSON Diff Tool
A JSON diff tool compares two JSON structures and highlights the differences — keys that were added, removed, or had their values changed. This is useful in many development workflows where you need to understand what changed between two versions of JSON data.
- API response comparison — Compare API responses before and after a change to verify that only expected fields changed.
- Config file diffing — Compare two versions of a JSON configuration file to spot unexpected differences before deployment.
- Debugging data changes — Compare two states of application data to identify what changed between a working and broken state.
- Code review — Understand the impact of data structure changes in pull requests.