AVAILABLE FOR WEB, FLUTTER & QA PROJECTS
How to use this tool
1. Specify HTTP Method & Route
Select GET, POST, PUT, PATCH, or DELETE and input endpoint path (e.g. /api/v1/orders).
2. Configure Request Payload & Params
Enter sample request JSON body, required query parameters, or URL path parameters.
3. Choose Test Categories
Select Positive (200/201), Negative Validation (400 Bad Request), Auth/Security (401/403), and Rate Limiting (429).
4. Copy Test Matrix & Script
Export tabular test cases or executable Playwright / Postman test script snippets.
Formula or logic used
REST API Verification Matrix Structure
Exhaustive API test suites test all branches of HTTP status codes, data types, authentication scopes, and edge boundary conditions.
2xx Success: 200 OK (GET/PUT), 201 Created (POST), 204 No Content (DELETE)4xx Client Fault: 400 (Malformed JSON / Validation), 401 (Missing Token), 403 (Forbidden Scope), 404 (Not Found), 422 (Unprocessable Entity), 429 (Rate Limit)5xx Server Fault: 500 (Internal Unhandled Exception), 503 (Service Unavailable)Security Checks: SQL injection strings, XSS scripts in payload, oversized payloads (> 5MB)
Examples
Example 1: POST /api/v1/users (User Registration)
Covers contract compliance, data integrity, and security hardening.
Example 2: GET /api/v1/orders/:id (Retrieve Order)
Ensures tenant isolation and defensive error handling.
Common use cases
API Contract Testing
Validate that backend microservices adhere strictly to OpenAPI / Swagger documentation.
Postman Collection Scaffolding
Quickly generate complete test assertions for Postman or Insomnia collections.
Security & Penetration Testing
Test edge cases including authorization bypass, fuzzing strings, and malformed headers.
CI/CD Smoke Testing
Run automated API test suites before promoting staging builds to production.
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Frequently asked questions
What is the difference between 401 Unauthorized and 403 Forbidden?
401 indicates missing or invalid authentication credentials (user is unauthenticated). 403 means the user is authenticated but lacks the necessary permissions or role to access the resource.
Why should I test 429 Too Many Requests?
Testing rate limits ensures your API gateway protects backend databases from DDoS attacks, brute-force login attempts, and runaway scraping bots.
How do I test API idempotency?
Send the exact same request twice (especially for POST requests with an Idempotency-Key header or PUT requests) and verify that the resource is only created once and returns identical results.
Should API tests assert response times?
Yes! High-performance SLA test cases verify that endpoints return responses within expected thresholds (e.g. p95 < 200ms) under standard loads.
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