JSON Diff / Compare

Paste two JSON objects and instantly see what was added, removed, or changed between them.

{ } Compare JSON

JSON A (left)
JSON B (right)
Paste JSON in both panels to compare

When to Use JSON Diff

JSON diff (JSON comparison) is the process of comparing two JSON documents to find exactly what was added, removed, or changed. This is essential for developers working with APIs, configuration files, and data pipelines.

API Response Comparison

When debugging an API, you often need to compare responses from different endpoints, environments (staging vs production), or time periods. A JSON diff instantly shows which fields changed, helping you pinpoint the issue without manually scanning through large response bodies.

Configuration Auditing

DevOps teams use JSON diff to compare config files before and after changes, ensuring that only the intended modifications were made. This is critical for infrastructure-as-code workflows where a single unexpected change can cause an outage.

How JSON Comparison Works

This tool performs a deep recursive comparison of two JSON structures. For objects, it compares keys and values at every nesting level. For arrays, it compares elements by index. The result is color-coded: green for additions (present in B but not A), red for removals (present in A but not B), and yellow for changed values (same key, different value).

Frequently Asked Questions

How do I compare two JSON objects?
Paste JSON A into the left panel and JSON B into the right panel. The tool auto-compares and highlights added (green), removed (red), and changed (yellow) keys with a summary count.
What is a JSON diff?
A JSON diff is a comparison between two JSON documents that identifies every addition, removal, and value change — recursively through all nested objects and arrays.
How do I find differences between two JSON files?
Copy the contents of both files and paste them into the two input panels. The diff engine compares all keys and values recursively and shows color-coded results.
How do I compare JSON responses from an API?
Copy each API response into a panel. The tool instantly highlights differences — useful for debugging API changes, comparing environments, or verifying response consistency.
What is the best way to diff JSON online?
Use this tool — it runs entirely in your browser, supports deeply nested data, and provides both tree view and raw unified diff views. No login or installation required.