Paste two JSON documents and see exactly what changed — every added, removed, and modified field highlighted instantly.
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JSON A — original
JSON B — modified
✓ The two JSON objects are identical.
Comparing API responses, config files, or database snapshots by eye is error-prone and slow. RealJSON's JSON diff tool walks both documents key by key and surfaces every change — added fields in green, removed fields in red, and modified values in amber.
The diff recurses into nested objects, reporting the full dot-notation path for every difference (e.g. address.city). Top-level changes and deeply nested ones are equally visible.
Above the diff output, count badges show how many fields were added, removed, and changed — useful for a quick "how big is this change?" scan before reading the details.
When enabled, arrays are compared index-by-index regardless of element order — useful for comparing sets or tag lists where order doesn't carry meaning.
Use the JSON Repair tool if either document has syntax errors before comparing. After diffing, the JSON Editor lets you apply changes interactively.
Browse all free JSON tools →
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