API Testing

Overview

Validate every endpoint for correctness, schema compliance, authorisation and resilience — long before an issue reaches the interface.

API defects are cheaper to find than UI defects and far more dangerous to miss. A single endpoint that accepts a malformed payload, leaks data to an unauthorised role or returns the wrong status code can quietly corrupt every client that consumes it.

We test each endpoint against its contract — request and response schemas, status codes, headers, pagination, error bodies and authorisation rules — then automate the whole set so the contract stays honoured as your services evolve.

How we work

1. 1

   Contract review

   We work from your Swagger/OpenAPI definition or WSDL and flag inconsistencies between the documentation and the live service.

2. 2

   Functional & negative testing

   Valid payloads, malformed payloads, missing fields, boundary values, wrong data types and invalid tokens — every path exercised.

3. 3

   Security & authorisation checks

   Role-based access, token expiry, injection attempts and data exposure verified at the service layer, not just behind the UI.

4. 4

   Automated regression

   Collections and Rest Assured suites wired into CI so every deployment re-validates the full API surface automatically.