Why not just use a text diff?

Text diff is line-based and confused by re-ordered keys, different indentation, or trailing-comma style. JSON Diff compares parsed structures, so identical data with different formatting reports zero changes.

What does the path syntax mean?

JSONPath-style: $ is the root, .key is a property, [n] is an array index. So $.posts[0].tags[1] is the second tag of the first post.

How are arrays compared?

By index, item-by-item. If the lengths differ, the extra trailing items are listed as added or removed. Reordering the same items still shows changes at the differing indices.

Is anything uploaded?

No — both JSONs are parsed and diffed locally in your browser.

JSON Diff

Plain text diff treats JSON as lines of characters; JSON Diff understands the structure. Paste two JSON documents and get a typed list of changes — added paths in green, removed in red, changed values in amber, each with a dotted-path location like $.address.zip. Reorder keys without seeing 'differences', spot missing fields instantly, and stop scanning whitespace.

—

Original

Changed

Changes+ 1− 0~ 3

~ $.age30 → 31
~ $.roles[1]"editor" → "viewer"
~ $.address.zip"04000" → "04001"
+ $.address.country"KR"

How to use

Paste the original JSON on the left, the new one on the right.
Read the path-based change list.
Parser errors show next to whichever side is invalid.

Frequently asked questions

Why not just use a text diff?: Text diff is line-based and confused by re-ordered keys, different indentation, or trailing-comma style. JSON Diff compares parsed structures, so identical data with different formatting reports zero changes.
What does the path syntax mean?: JSONPath-style: $ is the root, .key is a property, [n] is an array index. So $.posts[0].tags[1] is the second tag of the first post.
How are arrays compared?: By index, item-by-item. If the lengths differ, the extra trailing items are listed as added or removed. Reordering the same items still shows changes at the differing indices.
Is anything uploaded?: No — both JSONs are parsed and diffed locally in your browser.

Guides on this topic

Why numbers change when they pass through a program 0.1 plus 0.2 comes out as 0.30000000000000004, a long ID loses its last digits, and a total is a cent off. Almost all of it comes from one design decision: numbers are stored as binary fractions with a fixed budget of bits.

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