How do I compare two JSON files to find differences online?

Upload or paste your two JSON documents in the left and right panels above. The tool performs a deep structural comparison and highlights added keys (green), removed keys (red), and changed values (yellow). Results appear instantly as you type or upload.

What types of differences does the JSON diff tool detect?

The tool detects: added keys (present in the second JSON but not the first), removed keys (present in the first but not the second), and changed values (same key but different value). Type changes (e.g. a string becoming a number) are also flagged as value changes.

Does the JSON diff tool compare deeply nested objects and arrays?

Yes. The comparison is fully recursive — nested objects and arrays at any depth are compared property by property. Array element order matters: [1,2,3] and [1,3,2] are considered different.

Is the JSON diff comparison case-sensitive?

Yes. Key names and string values are compared with case sensitivity: "Name" and "name" are treated as different keys, and "Hello" and "hello" as different values.

Is the JSON diff tool free and private?

Yes — completely free, no account needed, and your JSON data is never sent to any server. Safe for comparing API responses that contain tokens or sensitive payloads.

JSON diff

JSON Diff

Compare two JSON files side by side. Instantly spot added, removed, and changed keys.

Your files are processed locally and never uploaded to our servers.

Original JSON (A)

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Modified JSON (B)

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How it works

1
Upload your file
Drop your file or click to browse. No size limit.
2
Convert instantly
Processed in your browser — nothing is uploaded to any server.
3
Download the result
Your converted file is ready in seconds.

Frequently Asked Questions

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