JSON Diff

JSON Diff compares two documents — Original (A) and Modified (B) — by their structure, not as text. You see only real changes.

What counts as a change

• Key order never counts. {"a":1,"b":2} equals {"b":2,"a":1}.
• Formatting never counts — whitespace, indentation, 1.0 vs 1, "\u00e9" vs "é".
• Changes are labelled Added, Removed, Changed, or Type changed (for example the number 56.3 becoming the string "73.80" — often a bug).

Matching array items

Choose how arrays are compared with the Arrays option:

Mode	Use it when	Example path
Smart (default)	Most of the time. Finds an id field (id, uuid, sku, userId…) and matches items by it, wherever they are. Without one, it lines up unchanged items so a single insertion is a single change.	$.items[sku="BK-101"].qty
Match by key…	You know the id field, e.g. code.	$.rates[code="INR"]
By position	Order matters (e.g. steps, rankings).	$.steps[2]
Ignore order	Arrays are sets, like tags.	—

Ignoring noisy fields

Type field names into Ignore fields, separated by commas. They’re ignored at any depth. Wildcards work:

updatedAt, *At, requestId, trace*

When a field that looks like a timestamp or request id changes, CurlyJSON suggests it — click + ignore updatedAt to add it.

Views

• Changes — a list with filters (Added / Removed / Changed / Type). Click a path to copy it.
• Side by side — both documents normalised (keys sorted, ignored fields hidden, matched items aligned) with unchanged parts folded.
• JSON Patch — standard RFC 6902 operations that turn A into B exactly. Copy or download.
• ✦ Summary — a short plain-English summary of the changes (AI features).

Sharing results

• Copy report copies a Markdown table you can paste into Jira, GitHub or Slack.
• Share creates a link containing both documents.
• Swap exchanges A and B. Drop two files at once to fill both sides.