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JSON Diff Viewer

Compare two JSON objects side-by-side. Color-coded additions, deletions, and modifications with deep nested path tracking.

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JSON Diff Guide

A JSON diff tool compares two JSON documents and shows exactly what changed between them. This is essential when debugging API responses, tracking configuration changes, or reviewing data migrations.

Color Coding

  • Green — Added: Keys present in JSON B but not in JSON A
  • Red — Removed: Keys present in JSON A but not in JSON B
  • Yellow — Modified: Keys in both but with different values
  • Gray — Unchanged: Keys in both with identical values

Common Use Cases

  • Comparing API responses before and after a code change
  • Auditing configuration file changes between environments
  • Reviewing database record changes in JSON export format
  • Debugging why two objects that should be identical are different
  • Verifying data migration correctness between systems

Deep Nested Comparison

Unlike simple text diffs, a JSON diff tool understands the structure of the data. It traverses the object tree recursively so you can see exactly which nested field changed — for example user.address.city changed from "London" to "Paris" — rather than just seeing a block of changed text.

Options Explained

  • Ignore key order: Treats {"a":1,"b":2} as equal to {"b":2,"a":1}
  • Ignore whitespace: Trims string values before comparing (useful for form data)
  • Case-insensitive keys: Treats Name and name as the same key

Related Tools

JSON Formatter • JSON to TypeScript • JSON Schema Generator • JSON Path Finder • CSV to JSON Converter

Frequently Asked Questions

Is the JSON diff tool free?

Yes, completely free with no signup required. The diff engine runs entirely in your browser — your JSON is never sent to a server and there are no usage limits.

Can it compare deeply nested JSON?

Yes. The diff engine recursively traverses nested objects and arrays to any depth, displaying the full dot-notation path (e.g. user.address.city) for every changed field.

Does it support JSON arrays?

Yes. Arrays are compared element-by-index. Added, removed, and modified items are all highlighted with their [index] position shown in the path column.

What does "Ignore key order" mean?

When enabled, objects with the same keys and values are treated as identical even if the keys appear in a different order. This is useful when comparing API responses that may serialize fields differently across environments.

Can I export the diff result?

Yes. Click Copy Report to copy a plain-text diff summary using +/-/~ notation to your clipboard. The report includes a header with added, removed, modified, and unchanged field counts.

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