Test Case Formatter Bug Report Generator Test Data Generator RTM Generator Test Estimation Calculator Test Case Review Checklist Severity & Priority Matrix API Test Case Template Builder Test Metrics Calculator QA Daily Status Report Test Closure Report Interview Question Bank JsonPath Evaluator Json Formatter Assertion Generator Boundary Value Generator Cron Generator Api Difference Checker
FREE TESTING UTILITY SECURE & PRIVATE

API Difference Checker

Spot breaking changes in seconds. Compare JSON or XML responses side-by-side to identify added, removed, or modified fields across different API versions.

Expected JSON (Baseline)
Actual JSON (New Build)
Difference Report
Paste your payloads above to see differences highlighted...
STEP 1

Input Source

Paste your "Expected" or "Stable" API response into the left pane. This serves as your baseline (e.g., Production data).

STEP 2

Input Target

Paste your "Actual" or "New" response into the right pane. This is the data from your latest build or Staging environment.

STEP 3

Analyze Changes

Our semantic engine highlights Red (Removals), Green (Additions), and Blue (Updates).

Why API Regression Testing Matters

In modern Agile development, backend APIs evolve rapidly. Even a minor change in the response structure can crash a mobile app or a frontend interface. An API Difference Checker allows QA Engineers and SDETs to perform instant comparisons and ensure that critical fields haven't been deleted during a code push.

Semantic vs. Textual Comparison

Standard text editors often flag "differences" just because the order of keys in a JSON object changed. Our tool performs a Semantic Comparison; it understands the object tree. If a field moves from the top to the bottom but retains its value, our tool correctly identifies it as "Unchanged," saving you from investigating false-positive bugs.

💡 Software Tester's Pro-Tip

Use this tool during UAT (User Acceptance Testing). Paste your Production response on the left and your UAT build response on the right. Any discrepancies will be highlighted instantly, allowing you to generate professional bug reports.