JSON Compare
Compare two JSON objects side-by-side and highlight the differences. Supports tree view and raw diff.
What is JSON Comparison?
JSON comparison (or JSON diffing) is the process of checking two JSON documents against each other to find exactly what differs between them — which keys were added or removed, and which values changed. Because JSON is often deeply nested, spotting a single changed value by reading two documents side by side is slow and error-prone. A JSON compare tool automates that by walking both structures and highlighting every difference.
A good JSON diff checker compares more than just the top-level keys — it recurses into nested objects and arrays, so a changed value three levels deep is caught just as reliably as one at the root. It should also validate both inputs first, so you're never comparing a syntax error against valid JSON by mistake.
This is especially useful when working with APIs, where a response can contain dozens of fields and only one needs to change for a test to fail, or when tracking configuration across environments, where an untracked difference can cause a production incident.
This page lets you compare two JSON files online for free, directly in your browser. Paste the original and modified JSON into the two editors, click Compare, and see a side-by-side diff with additions and removals color-coded — nothing is uploaded or sent to a server.
Why Compare JSON?
API Testing
Compare an expected API response against the actual response to confirm your endpoint returns exactly what it should.
Config Management
Diff configuration files across environments (staging vs. production) to catch unintended drift before it causes an incident.
Debugging
When behavior changes after a data update, comparing the before and after JSON pinpoints exactly which field changed.
Version Tracking
See what changed between two versions of a JSON file — useful for reviewing data exports, snapshots, or generated files.
Example
Here are two versions of the same JSON object — comparing them flags the changed age and city values, plus the added "TypeScript" skill.
{
"name": "Alice",
"age": 30,
"city": "New York",
"skills": ["JavaScript", "React"]
}{
"name": "Alice",
"age": 31,
"city": "San Francisco",
"skills": ["JavaScript", "React", "TypeScript"]
}Features
Compare
Diff two JSON documents and highlight added, removed, and changed values.
Deep Comparison
Nested objects and arrays are compared at every level, not just the top level.
Paste from Clipboard
Paste JSON directly into either editor with a single click.
Sample Data
Load two sample JSON objects to see how the diff view works.