JSON Compare

Compare two JSON files side-by-side with semantic diff highlighting. Instantly see what was added, removed, or modified between your JSON documents.

How to Use

  1. 1Paste or upload the original JSON into the left panel (JSON A).
  2. 2Paste or upload the modified JSON into the right panel (JSON B).
  3. 3Optionally configure comparison options (ignore key order, array order, case sensitivity).
  4. 4Click "Compare" or press Ctrl+Enter to see the side-by-side diff result.
  5. 5Review the highlighted differences. Click "Back to Compare" or press Escape to edit.

Use Cases

  • API Debugging: Compare responses across versions
  • Config Changes: Verify configuration updates
  • Data Validation: Check ETL pipeline outputs
  • Test Fixtures: Review test data changes

Diff Highlighting

  • Green: Added in B
  • Red: Removed from A
  • Yellow: Modified value

Keyboard Shortcuts

  • Ctrl+Enter — Compare
  • Escape — Back to input

Frequently Asked Questions

What is JSON comparison?

JSON comparison (or JSON diff) is the process of analyzing two JSON documents to identify differences between them. This includes finding added keys, removed keys, and modified values. Professional JSON diff tools use semantic comparison to ignore superficial differences like key order or whitespace.

How does semantic JSON comparison work?

Semantic comparison parses JSON into data structures and compares meaning rather than text. This means two objects with the same keys and values but in different order are considered identical, since JSON objects are unordered by specification. This differs from text-based comparison which would flag them as different.

Does key order matter when comparing JSON?

By default, no. JSON objects are unordered collections by specification, so {"a":1,"b":2} and {"b":2,"a":1} are semantically identical. Our tool ignores key order by default, but you can enable strict ordering comparison in the options if needed.

Does array order matter in JSON comparison?

Yes, by default. Unlike objects, JSON arrays are ordered lists where position matters. [1,2,3] and [3,2,1] are different. However, you can enable "Ignore array order" in options for cases where you want to compare arrays as sets.

What do the diff colors mean?

Green highlighting indicates lines/values that were added (exist in B but not A). Red highlighting shows removed content (exists in A but not B). Yellow/amber highlighting marks modified values (same key exists in both but with different values).

Is my data secure when comparing JSON files?

Absolutely. All comparison happens entirely in your browser using JavaScript. Your JSON data is never sent to any server, stored, or logged. This tool is completely privacy-first and works offline.

What are common use cases for JSON comparison?

Common use cases include: debugging API responses across versions, verifying configuration changes before deployment, comparing data exports, reviewing test fixture changes, validating ETL pipeline outputs, and tracking changes in JSON-based documents.

Can I compare large JSON files?

Yes! The tool is optimized for performance with large files. Both editors support scrolling through thousands of lines, and the diff view features synchronized scrolling to help you navigate large comparisons.

How do I use the two-step comparison flow?

Step 1: Paste or upload JSON into both panels (A and B). Step 2: Click "Compare" or press Ctrl+Enter. The view switches to show a side-by-side diff with highlighting. Click "Back to Compare" or press Escape to return to editing.

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