JSON Diff — Compare Two JSON Objects

Paste two JSON objects and see a plain-text diff: added keys, removed keys and changed values. Useful for comparing API responses or config files. Runs locally.

100% freeNo sign-upRuns in your browserNo upload · data stays private

📖 Read the full JSON Diff — Compare Two JSON Objects guide — how it works, examples & FAQ →

How to use this tool

  1. Paste the first JSON object in the left box.
  2. Paste the second in the right box.
  3. Read the diff output.

Example

{a:1, b:2} vs {a:1, b:3, c:4} → b changed (2→3), c added

Why it's private

This tool runs entirely in your browser using JavaScript. Whatever you paste is processed on your own device — it is never uploaded to a server, logged, or stored. Built by Calabi, which also strips AI metadata and C2PA signals from images and video.

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