JSON Diff Online — Find Differences Between JSON Files
A JSON diff tool shows the differences between two JSON documents line by line. Paste the original and changed JSON, format both, and instantly see what was added, removed, or modified — free and private.
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How to use JSON Diff
- Paste the original JSON on the left and the changed JSON on the right.
- Click Format both to normalize indentation for an accurate comparison.
- Review the highlighted additions, removals, and changes inline.
- Use Swap to reverse the sides, or Clear to start over.
Features
Side-by-side diff
See exactly what changed between two JSON documents.
Inline highlighting
Additions, deletions, and edits are color-coded line by line.
Format both sides
Normalize formatting so only real differences show up.
100% private
Both documents are compared in your browser — nothing is uploaded.
What is JSON Diff?
A JSON diff compares two documents and highlights their differences so you can review changes at a glance. It's ideal for tracking edits to configuration, API responses, and data snapshots. JSON Reader computes the diff in your browser and never uploads your data.
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Frequently Asked Questions
Everything you need to know about JSON Reader
Paste two JSON documents and the tool highlights every line that was added, removed, or changed, shown side by side.
Yes — click Format both so indentation and key spacing differences don't get flagged as real changes.
Yes. Both documents are compared entirely in your browser and are never uploaded to a server.