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Developer Utility

API Response Comparator & JSON Diff Checker

Compare JSON API responses side by side, find nested changes, and identify potentially breaking structural differences.

Developer Debugging Studio

Spot every API change.

Compare two JSON responses, inspect nested differences, and identify potentially breaking structural changes.

JSON response comparison
Before responseOriginal / baseline

Valid JSON

After responseUpdated / candidate

Valid JSON

Total differences5
Added1
Removed2
Changed1
Type changed1
Potentially breaking3

Difference explorer

Inspect changes by JSON Pointer location.

/permissions/1
RemovedBreaking risk
BEFORE
"write"
AFTER
(missing)
/status
Changed
BEFORE
"active"
AFTER
"inactive"
/user/age
Type changedBreaking risk
BEFORE
25
AFTER
"25"
/user/email
Added
BEFORE
(missing)
AFTER
"alex@example.com"
/user/role
RemovedBreaking risk
BEFORE
"admin"
AFTER
(missing)

Privacy: JSON is processed locally in your browser. Breaking-change indicators are heuristics, not a formal API compatibility guarantee. Ignoring array order compares sorted values, not objects matched by ID.

Quick Answer

What is an API response comparator?

An API response comparator identifies differences between two JSON responses. It helps developers spot added fields, removed fields, changed values, and data type changes between API versions or environments.

How It Works

How to compare two JSON API responses

Paste the original response into the Before editor and the updated response into the After editor. The tool automatically compares nested objects and arrays. You can ignore frequently changing fields such as IDs and timestamps, filter the results, and export a JSON report.

Example

JSON comparison example

Before: {"age":25,"role":"admin"}
After:  {"age":"25","email":"alex@example.com"}

This comparison identifies a changed type for age, a removed role field, and an added email field.

FAQ

Frequently asked questions

Does this tool compare nested JSON objects?

Yes. Nested fields are identified using JSON Pointer paths, such as /user/address/city.

Can I ignore timestamps and dynamic IDs?

Yes. Enter key names to ignore those fields anywhere in the JSON structure, or specify exact JSON Pointer paths.

Does a breaking-change warning guarantee incompatibility?

No. Removed fields and type changes are flagged as potentially breaking, but actual compatibility depends on the API contract and client expectations.

Is my JSON uploaded to a server?

No. Comparison is performed in your browser. The tool does not require uploading the JSON to DataStorified.

Related Tools

More JSON and developer utilities

Try the JSON Formatter, JSON Validator, JSON to CSV Converter, and Unicode Inspector.