API Testing
Your APIs are the backbone of your product. We make sure they're bulletproof — reliable, fast, and secure at every endpoint.
100%
Endpoint Coverage
<50ms
Avg Response Target
REST+GraphQL
All Protocols
Shift-Left
CI/CD Native
Modern applications are built on APIs. A single broken endpoint can cascade into a failed checkout flow, a disconnected integration, or a data leak. ProgmaticLabs delivers comprehensive API testing across REST, GraphQL, SOAP, and gRPC — covering functional correctness, performance under load, security vulnerabilities, and contract compliance. We integrate API test suites directly into your CI/CD pipeline so breakages are caught in seconds, not in production.
What We Cover
End-to-end coverage across every dimension of api testing.
Functional API Testing
Validate every endpoint for correct request/response schemas, status codes, business logic, error handling, and edge cases.
Contract Testing
Consumer-driven contract tests (Pact) ensure that provider APIs never break consumer expectations — catch breaking changes before deployment.
API Performance Testing
Benchmark response times, test concurrent request handling, identify rate-limiting behaviour, and simulate peak traffic with k6 or JMeter.
API Security Testing
Test for OWASP API Security Top 10 — broken authentication, excessive data exposure, mass assignment, injection, and BOLA vulnerabilities.
Integration & End-to-end Testing
Validate multi-step API workflows — OAuth flows, webhook delivery, third-party integrations, and event-driven message chains.
Schema & Validation Testing
JSON schema validation, OpenAPI/Swagger spec compliance, and response structure consistency across API versions.
Mock & Stub Services
Create realistic API mocks for services under development or third-party dependencies, enabling parallel development and testing.
Monitoring & Alerting
Continuous API monitoring in production with automated alerting for degraded response times, error rate spikes, or unexpected schema changes.
Why API Quality Is Your Product's Foundation
Your frontend can be pixel-perfect and your UX award-winning, but if the API layer is unreliable, users experience failures. API defects are uniquely dangerous because they often affect multiple consumers simultaneously — a single broken field can fail a web app, a mobile app, and a third-party integration all at once.
API testing also sits at the perfect intersection of shift-left quality and speed: it's orders of magnitude faster than end-to-end UI testing, runs in any environment without a browser, and catches integration failures that unit tests simply can't see.
ProgmaticLabs builds API test suites that developers actually want to maintain — clear, fast, and wired directly into your merge request pipeline. Our test-as-documentation approach means your API specs and your tests stay in sync automatically.
API Catalogue & Coverage Analysis
We map every API endpoint, categorise by risk and usage frequency, and identify coverage gaps in existing test suites.
Test Strategy & Tool Selection
We select the right tools — Postman, RestAssured, Karate, k6 — based on your stack, team skills, and pipeline requirements.
Test Suite Development
We build comprehensive test collections covering happy paths, negative cases, edge cases, security checks, and performance benchmarks.
CI Integration & Reporting
Tests run on every code push with rich dashboards showing endpoint coverage, response trends, and failure history.
Tools & Technologies
Industry-leading tools we work with every day.
Ready to elevate your api testing?
Get a free, no-obligation audit from our specialists and discover where your biggest quality gains are hiding.