How does JSON diff comparison work?

JSON diff compares two JSON objects recursively. It walks both object trees simultaneously, checking every key and value. It reports three types of differences: added (key exists only in the right/modified JSON), removed (key exists only in the left/original JSON), and changed (key exists in both but values differ).

How are arrays compared in JSON diff?

Arrays are compared element-by-element by index position. If the left array has 3 elements and the right has 5, elements at indices 0-2 are compared for changes, and elements at indices 3-4 are reported as added. This is positional comparison — it does not try to match elements by content.

What is JSONPath in diff output?

JSONPath is a notation for identifying specific values in a JSON document. The root is $, object keys use dot notation ($.config.theme), and array elements use bracket notation ($[0], $.items[2]). Each diff entry shows the exact JSONPath where the change occurred.

Can I compare nested JSON objects?

Yes. This tool recursively compares all levels of nesting. A change deep inside a nested structure like $.servers[0].config.port will be reported with its full path. Both objects and arrays can be nested to any depth.

What is JSON diff used for?

Common uses include: comparing API responses before and after changes, reviewing configuration file differences, debugging data transformations, comparing database records, verifying data migration results, and reviewing changes in CI/CD pipelines.

How do I read the diff output?

Green entries with + are additions (new keys/values). Red entries with - are removals (deleted keys/values). Yellow entries with ~ are modifications showing the old value crossed out and the new value. Each entry shows the JSONPath location of the change.

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JSON Diff Checker

A JSON diff tool compares two JSON objects and identifies all differences: added keys, removed keys, and changed values. Differences are shown at each JSONPath location (e.g., $.config.theme). This is useful for comparing API responses, configuration files, database records, or any structured data. Arrays are compared element-by-element by index position.

Compare two JSON objects and see all differences. Shows added, removed, and changed values with JSONPath locations. Supports nested objects and arrays. Color-coded diff output.

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JSON Inputs

Original (Left)

Modified (Right)

How to Use

1
Paste original JSON
Paste the original (baseline) JSON object into the left input area
2
Paste modified JSON
Paste the modified (updated) JSON object into the right input area
3
Review differences
See all differences color-coded: green for added, red for removed, yellow for changed values with JSONPath locations
4
Copy the diff
Click "Copy diff" to export the list of all changes in a readable text format

Frequently Asked Questions

How does JSON diff comparison work?: JSON diff compares two JSON objects recursively. It walks both object trees simultaneously, checking every key and value. It reports three types of differences: added (key exists only in the right/modified JSON), removed (key exists only in the left/original JSON), and changed (key exists in both but values differ).
How are arrays compared in JSON diff?: Arrays are compared element-by-element by index position. If the left array has 3 elements and the right has 5, elements at indices 0-2 are compared for changes, and elements at indices 3-4 are reported as added. This is positional comparison — it does not try to match elements by content.
What is JSONPath in diff output?: JSONPath is a notation for identifying specific values in a JSON document. The root is $, object keys use dot notation ($.config.theme), and array elements use bracket notation ($[0], $.items[2]). Each diff entry shows the exact JSONPath where the change occurred.
Can I compare nested JSON objects?: Yes. This tool recursively compares all levels of nesting. A change deep inside a nested structure like $.servers[0].config.port will be reported with its full path. Both objects and arrays can be nested to any depth.
What is JSON diff used for?: Common uses include: comparing API responses before and after changes, reviewing configuration file differences, debugging data transformations, comparing database records, verifying data migration results, and reviewing changes in CI/CD pipelines.
How do I read the diff output?: Green entries with + are additions (new keys/values). Red entries with - are removals (deleted keys/values). Yellow entries with ~ are modifications showing the old value crossed out and the new value. Each entry shows the JSONPath location of the change.

JSON Diff Checker

JSON Inputs

How to Use

Frequently Asked Questions

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