How do I compare two JSON objects?

Paste the first JSON in the left panel and the second in the right panel. Both are formatted to 2-space indentation before comparison, and differences are highlighted in green (added) and red (removed).

Does JSON Diff care about key order?

Yes. The comparison is based on the serialized text after formatting, so objects with the same keys in different orders will show differences. Use a JSON formatter first if key order matters.

Is the JSON diff tool free?

Yes, completely free. Comparison runs entirely in your browser using the diff library — no data is sent to any server, and no signup is required.

JSON Diff

Compare two JSON objects and highlight differences instantly online. Free JSON diff tool that formats both inputs and shows added, removed, and unchanged lines. No signup required.

Left (Original)

Right (Modified)

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How to Use the JSON Diff Tool

Paste the first JSON in the left panel and the second in the right panel.
Both JSONs are automatically formatted before comparison so whitespace differences are ignored.
Added lines appear in green and removed lines in red.
The toolbar shows the count of added, removed, and unchanged lines.

Common Uses

Comparing API response payloads between environments
Reviewing config file changes in pull requests
Auditing JSON data migrations
Debugging data transformation pipelines