JSON diff

About this tool

A line diff treats a reordered key, or a change in indentation, as a change. This page parses both sides first. Two objects with the same keys and values compare equal even when the keys are written in a different order.

Each difference is one line. A changed field shows the path, the left value, and the right value. An added field exists only on the right. A removed field exists only on the left. A missing key is not the same as a key whose value is null. The number 1 and the string "1" are a change.

Arrays of objects are matched by id, _id,key, slug, or name, in that order, when every item on a non-empty side is an object with that field and the values are unique. A reorder is then reported as a move, and a field change is reported on that same item. Every other array, including one with duplicate ids, is compared by index, so a reorder looks like paired changes. The page lists the first 400 lines. Each side accepts a file up to 2 MB.

Both sides must be JSON that JSON.parse accepts. A broken side is named in the error. Integers above 9007199254740991 are rounded by JavaScript before the comparison, and the page says so. A long value in a line is cut at 160 characters.