Api Contract Tester

Name: Api Contract Tester
Price: 5 USD
Availability: InStock
Author: Agensi

by Samuel Rose

Turn OpenAPI specs into exhaustive, framework-ready test suites covering happy paths, edge cases, and security gaps.

30-day refund guarantee

Secure checkout via Stripe

3 installsSecurity scanned

Works with the AI tools you already use

CCCGGVWM+14 more

See it in action

You say

I need to test the user registration endpoint at /v1/users. Can you generate some Jest tests to validate the request body, specifically focusing on email validation errors?

Your agent does

"test_user_registration_invalid_email": it("returns 422 when email is missing '@'", async () => { const res = await request(app).post("/v1/users").send({ email: "bad-email" }); expect(res.status).toBe(422); expect(res.body.errors).toContainEqual(expect.objectContaining({ field: "email" })); });

What you get

Generate framework-ready test suites from OpenAPI specificationsIdentify boundary conditions and off-by-one errors in API endpointsDetect authentication vulnerabilities and security gaps in contract logicVerify schema compliance against production-ready regression suites

About this skill

Exhaustive API Contract & Regression Testing

Transform your OpenAPI specs or Postman collections into professional-grade test suites. Unlike basic tools that only check for "200 OK" responses, this skill acts as a senior quality engineer to probe the boundaries of your API. It identifies off-by-one errors, authentication vulnerabilities, and schema mismatches before they reach production.

What it does

Parse & Analyze: Extracts endpoints, schemas, and constraints from OpenAPI/Swagger, Postman, or raw code.
Constraint Testing: Generates tests for min/max values, regex patterns, and enum boundaries.
Security First: Automatically builds suites for missing tokens, malformed JWTs, and unauthorized cross-user access.
Robust Validation: Checks for breaking changes between versions, including field removals and type shifts.
Framework Flexibility: Generates code for Jest, Pytest, Vitest, Playwright, or curl scripts.

Why use this skill

Writing comprehensive API tests is tedious and manual. This skill automates the creation of "the tests developers forget"—such as testing rate-limit headers, pagination boundaries, and SQL injection strings. It ensures consistent error response formats and prevents internal stack traces from leaking to users. The result is a production-ready test suite with a detailed coverage report across 10 distinct categories.

Supported Outputs

JavaScript/TypeScript: Jest, Vitest, Supertest, Playwright.
Python: Pytest with requests or httpx.
DevOps: Shell scripts using curl with assertions.
Reporting: Markdown-based coverage reports across happy paths, auth, and edge cases.