Developer Utilities · Free tool
JSON Diff Checker
Find added, removed, and changed keys across nested objects with a free instant diff tool in your browser—no sign-up, just paste and compare.
Updated June 2026
Added
2
Removed
0
Changed
2
~ version: "1.0.0" → "1.1.0"
+ tools[3]: "csv"
~ author.role: "founder" → "founder+engineer"
+ published: true
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What it does
Compare two JSON payloads and see every added, removed, and changed key highlighted — including deep nested changes inside arrays and objects. Perfect for diffing two API responses, a schema change, or a config file across environments.
For line-level text diffs try diff checker. Format either side first with JSON formatter, and for YAML try YAML formatter before converting.
Embed this tool on your siteShow snippetHide
Paste this snippet into any page. Loads on-demand (lazy), no tracking scripts, and sized to most dashboards. Replace the height to fit your layout.
<iframe src="https://freetoolarena.com/embed/json-diff-checker" width="100%" height="720" frameborder="0" loading="lazy" title="JSON Diff Checker" style="border:1px solid #e2e8f0;border-radius:12px;max-width:720px;"></iframe>How to use it
- Paste JSON A in the left box and JSON B on the right.
- Click Compare — changes are highlighted per key.
- Use the summary at the top to see total added / removed / changed.
- Copy the diff report or individual changes.
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