JSON Diff Checker
Compare two JSON files or JSON objects online. Find added, removed, and changed values instantly with ToolJi's free 100% client-side JSON diff checker.
How do you compare two JSON objects online?
Paste original JSON into JSON A and modified JSON into JSON B in ToolJi's JSON Diff Checker, then click 'Compare JSON'. Added fields appear in green (+), removed fields in red (-), and modified values in amber (~).
What is JSON Diff Checker?
A JSON Diff Checker compares two JSON objects or files (JSON A and JSON B) and highlights all added (+), removed (-), and modified (~) fields in a side-by-side or unified view.
Who Needs It?
Software engineers, API developers, QA testers, database administrators, and data analysts comparing API responses, configuration files, or database schemas.
Problem Solved
Eliminates hours of manual visual line-by-line inspection when debugging why two JSON payloads differ or verifying breaking changes in API updates.
How to Compare Two JSON Files Online
- 1
Paste or Upload JSON A
Paste original JSON code or upload an .json file into the JSON A box.
- 2
Paste or Upload JSON B
Paste updated JSON code or upload an .json file into the JSON B box.
- 3
Click Compare JSON
Click the Compare JSON button to calculate differences instantly.
- 4
Review & Export Diff
Inspect added, removed, or changed values in Side-by-Side or Unified view and export report.
Common Uses for JSON Diff Checker
Comparing REST API response payloads between staging and production environments.
Verifying schema migrations and database payload changes.
Inspecting configuration changes in package.json or application settings.
Debugging unexpected API regressions or breaking field removals.
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Frequently Asked Questions
Is my JSON data uploaded to a server?
No. All JSON parsing, validation, and diff calculations take place 100% locally inside your web browser.
Does key order affect the JSON comparison?
By default, 'Ignore Key Order' is enabled so {"a":1,"b":2} and {"b":2,"a":1} are recognized as identical. You can toggle strict key ordering in Compare Options.
Can I compare deeply nested JSON objects and arrays?
Yes. The diff engine traverses deeply nested objects and array elements, displaying full dot-notation paths (e.g. user.profile.address.city).
Can I download or copy the diff comparison report?
Yes, you can copy the diff summary to your clipboard or download a structured JSON diff report.
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