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Find and visualize differences between two JSON files in seconds. Fast, secure, and entirely client-side — your data never leaves your browser.
Why JSONDiff
Instant comparison with no server processing. Everything runs in your browser for maximum speed.
Your JSON data never leaves your browser. No data is stored or transmitted to any server.
No signup required, no usage limits. Use as much as you need, completely free.
Documentation
JSONDiff is an online JSON compare tool for developers, testers, data analysts, and anyone who needs to review changes between two JSON objects. Use it to compare API responses, configuration files, exported records, webhooks, test fixtures, and data transformations directly in your browser.
Properties that exist in the original but are absent in the modified JSON.
New properties present in the modified JSON but not in the original.
Properties where the data type changed, e.g. string to number.
Same type, different value — ideal for tracking data updates.
Keys or array values that exist in the modified JSON but not in the original JSON.
Fields that existed in the original JSON but are missing from the modified version.
Matching fields where the value changed while the path stayed the same.
Fields where the data type changed, such as a number becoming a string or an object becoming an array.
A JSON diff compares two JSON documents and highlights what was added, removed, or changed between the original and modified versions.
Yes. The tool is designed to compare nested objects and arrays so you can inspect changes deep inside a JSON structure.
No. The comparison runs in your browser, so the JSON you paste or upload is not sent to a server for processing.
A diff tool must parse both documents before it can compare object paths, values, arrays, and types. Invalid JSON must be fixed first.