Free online JSON compare and diff tool. Compare two JSON files side by side with visual diff highlighting, three-way merge, AI-powered diff explanation, and JSON Patch export. Supports nested objects, arrays, and smart matching. 100% browser-based.
100% browser-based — your data never leaves your device
Paste the first JSON document into the left textarea as your baseline.
Paste the second JSON document into the right textarea.
Click Compare to see the diff. Red = removed, green = added, yellow = modified lines.
Practical examples to help you get the most out of JSON Compare:
// Left: {"name": "Alice", "age": 30, "role": "admin"}
// Right: {"name": "Alice", "age": 31, "role": "user"}
// Result: age and role highlighted as changed// Left: {"id": 1, "name": "Product"}
// Right: {"id": 1, "name": "Product", "price": 9.99}
// Result: price shown as added (green)Paste raw JSON text, not stringified JSON (with escaped quotes). The tool parses each input independently before comparing.
JSON object key order does not affect the diff. The tool compares by key-value pairs, not by line position. For order-sensitive comparison, use arrays.
Paste two JSON inputs side by side and click 'Compare'. The tool recursively compares every key, value, and array element.
No. All processing is done locally — your data never reaches any server.
The tool detects added, removed, and modified keys, as well as changes to values, array elements, and nested objects at any depth.
Yes. The tool handles large JSON documents efficiently, though very large files may take a moment to process depending on your browser's memory.
View both JSON inputs side by side with additions, deletions, and changes highlighted in real-time.
Each input is validated independently. Errors are highlighted so you can fix malformed JSON before comparing.
Compares nested objects and arrays recursively to find differences at any depth.
All comparison happens in your browser. Nothing is uploaded to any server.
JSON Compare is useful in a variety of scenarios across different workflows:
Reviewing API response changes between deployments
Debugging JSON data differences in configuration files
Validating JSON structure transformations
For accurate diffs, ensure both JSON inputs have the same structure. Different key orderings won't affect the diff but different nesting levels will show as changes.
Save API responses as JSON files and compare new responses against baselines to catch regressions after deployments.
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Compare two JSON files side by side with real-time diff highlighting.
Paste the first JSON document into the left textarea as your baseline.
Paste the second JSON document into the right textarea.
Click Compare to see the diff. Red = removed, green = added, yellow = modified lines.
Paste or type two JSON documents below to compare them side by side. The tool detects additions, removals, and modifications in nested objects and arrays. Toggle between side-by-side, unified diff, change list, and three-way merge views. Use the schema option to validate both inputs against a JSON Schema before comparing.
{"name":"Alice","age":30,"role":"admin","skills":["js","ts"]}{"name":"Bob","age":25,"role":"editor","location":"NYC"}Format, minify, validate, and explore JSON with tree view, JSONPath queries, and multi-format export — the complete JSON workbench.
JSON CompareCompare two JSON files side by side with real-time diff highlighting.
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