JSON API Version Diff — Compare REST Responses

JSON Diff for API Version Comparison

Detect breaking changes between API versions by comparing JSON responses side by side. Color-coded diff shows added, removed, and changed fields.

Detect breaking changes and regressions between API v1 and v2 responses by pasting both JSON payloads. Color-coded semantic diff highlights every added, removed, and changed field — catch breaking changes before they reach production.

API Version Comparison with Semantic JSON Diff

A "breaking change" in a JSON API means a field was removed, renamed, or its type changed in a way that breaks existing API consumers. Our semantic diff engine compares two JSON payloads structurally — not just as text — so field reordering does not produce false positives.

Color Code Guide

■ Green — New field added in the right (v2) response
■ Red — Field removed from the left (v1) response
■ Amber — Field present in both but with a changed value or type

Who this guide is for

Compare v1 and v2 API responses to identify breaking changes
Verify API contract before and after a deployment
Compare development and production API responses for regressions
Validate that API responses match expected test fixtures

Frequently Asked Questions

What is a breaking change in a JSON API?

A breaking change is a modification to an API response that breaks existing clients: removing a required field, changing a field's data type, or renaming a key.

Can I diff deeply nested JSON API responses?

Yes. The diff engine recursively compares nested objects and arrays at every level.

Does reordering JSON keys count as a difference?

No. Our semantic diff compares keys by name, not position. Reordering object keys does not produce diff results.