AppsFactory

JSON Diff

Compare two JSON objects and see the differences highlighted

JSON Diff - Compare JSON Objects Side by Side

Tracking down differences between two JSON files by eye is slow and error-prone. The JSON Diff tool highlights exactly what was added, removed, and modified between two JSON objects, giving you a clear, color-coded view of every change.

Features

  • Side-by-side comparison - View both JSON inputs next to each other with differences highlighted inline
  • Change classification - Each difference is labeled as added, removed, or modified with distinct colors
  • Tree view - Expand and collapse nested objects to focus on the sections that matter
  • Flat diff view - See all changes as a sequential list of JSON paths and their old and new values
  • Deep equality check - Detects differences in nested objects and arrays regardless of depth
  • Array diffing - Identifies reordered, inserted, and deleted array elements intelligently
  • Formatted output - Pretty-prints both inputs automatically, even if the original JSON is minified

How to Use

  1. Paste your first JSON object into the left panel.
  2. Paste your second JSON object into the right panel.
  3. Click Compare to generate the diff.
  4. Review highlighted changes in either the tree view or the flat diff list.
  5. Use the expand and collapse controls to drill into specific sections of large objects.

Use Cases

  • Comparing API responses before and after a code change
  • Reviewing configuration file updates between deployments
  • Debugging data transformation pipelines by checking input versus output
  • Validating that a migration script produced the expected JSON structure

FAQ

Does the tool handle large JSON files?

Yes. The tool processes JSON objects with thousands of keys efficiently. For extremely large files, the tree view with collapse controls helps you navigate without being overwhelmed by the full output.

How are array differences detected?

The tool compares arrays by index position by default. If elements have been reordered, each position is treated as a change. This approach works well for ordered data and configuration arrays.

Can I ignore specific keys in the comparison?

Yes. You can specify keys to exclude from the diff, which is useful for filtering out timestamps, IDs, or other fields that change between every request and would otherwise clutter the results.