JSON Compare Online — Compare Two JSON Files Side by Side
Compare two JSON documents side by side and see exactly what changed. Paste the original and the modified JSON, format both, and review every added, removed, or changed line — free and private.
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How to use JSON Compare
- 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 Compare?
Comparing JSON highlights the differences between two versions of the same data — useful for reviewing API changes, config edits, and test fixtures. JSON Reader formats both sides and marks every difference inline, entirely in your browser.
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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.