Contact
πŸ”— Software Testing

APIs & Microservices Testing Services

Most QA teams focus on what users see and click. But your real business logic, data processing, and system integrations happen at the API layer, and those bugs don't show up in UI tests. An untested API can corrupt data, silently expose user information, or fail in ways that are only discovered in production.

  • 01All endpoints, all HTTP methods
  • 02Auth flows, tokens, rate limits
  • 03Contract testing between services
  • 04Error handling and edge cases
  • 05Schema validation and drift
Book a Free QA Strategy Call All Platforms
3
Protocols
πŸ’»ClientπŸ”€API GatewayAuth Β· Rate limit Β· RouteπŸ›οΈProducts APIπŸ‘€Users APIπŸ’³Payments APIGETPOSTPUTDELETEPact ContractConsumer-drivenREST Β· GraphQL Β· gRPC Β· WebSocket

Your UI looks fine, but your API is where the real bugs live

We test every endpoint, every auth flow, every contract between services. REST, GraphQL, gRPC, event-driven architectures, and the third-party integrations your systems depend on. Nothing gets through untested.

The whole thing gets automated and wired into your CI/CD. On every PR and every deployment, your API contracts are validated before code reaches production. No surprises.

What We Test

What We Test on APIs & Microservices

01

REST APIs

  • βœ“All HTTP methods: GET, POST, PUT, PATCH, DELETE
  • βœ“Request and response schema validation
  • βœ“Status codes and error message accuracy
  • βœ“Pagination, filtering, and sorting behaviour
02

GraphQL APIs

  • βœ“Query and mutation correctness
  • βœ“Subscription testing
  • βœ“Schema introspection and breaking change checks
  • βœ“N+1 query problem detection
03

gRPC Services

  • βœ“Protocol buffer schema validation
  • βœ“Unary and streaming RPC testing
  • βœ“Service discovery and load balancing
  • βœ“Deadline and timeout handling
04

Auth & Security

  • βœ“OAuth2, JWT, and API key validation
  • βœ“Token expiry and refresh flow testing
  • βœ“Rate limiting and throttling enforcement
  • βœ“SQL injection via API payloads
05

Contract Testing

  • βœ“Consumer-driven contracts with Pact
  • βœ“Breaking change detection before deployment
  • βœ“Schema versioning and backward compatibility
  • βœ“Service-to-service contract validation
06

Integration Testing

  • βœ“Third-party API mock and dependency testing
  • βœ“Webhook delivery, retry, and failure handling
  • βœ“Event-driven system testing: Kafka, SNS/SQS
  • βœ“Database state assertions post API call
Our Approach

How We Test This Platform

01

We map every endpoint first

We catalogue all your endpoints, auth mechanisms, and integration points. If you have OpenAPI or Swagger specs, those become our contract baseline from day one.

02

We design tests for every scenario

Happy paths, error scenarios, boundary conditions, security edge cases: every endpoint gets the full treatment, not just the sunny-day flow.

03

We mock your dependencies

We set up WireMock or similar to simulate third-party APIs and services. Your test suite runs fast, stays stable, and never breaks because an external API was down.

04

We automate and wire into your pipeline

Full test suite in Postman/Newman or Python, plugged into your CI/CD. Every PR and every deployment triggers the suite automatically.

05

We add contract tests between services

Consumer-driven contract tests with Pact mean each microservice team can deploy independently without accidentally breaking other services.

06

We set up ongoing monitoring

Continuous API monitoring with regression detection. If a schema changes or a response degrades, we catch it before it becomes a production incident.

How the service runs, from the first call to a running suite: API Testing.

Tools We Use

Technology Stack for This Platform

PM icon
Postman
API design, testing, and team collaboration
PY icon
Python Requests
Flexible API test scripting for complex scenarios
PC icon
Pact
Consumer-driven contract testing between services
NW icon
Newman
Postman CLI runner for CI/CD pipeline integration
WM icon
WireMock
API mocking for fast, isolated test execution
JV icon
REST Assured
Java-based REST API testing library
GA icon
GitHub Actions
API tests triggered on every PR and deployment
JR icon
Jira
Defect tracking and test traceability
Real Bug Examples

Common Bugs We Catch on APIs & Microservices

!
Sensitive endpoint missing authentication entirely
Impact:Immediate data breach and security incident
!
Schema change silently breaks downstream consumers
Impact:Production outage across multiple services
!
Race condition under concurrent API requests
Impact:Data corruption that is hard to reproduce
!
Access token not invalidated on logout
Impact:Session hijacking window remains open
!
No rate limiting on authentication endpoints
Impact:Brute force attack vector left wide open
!
PII returned in API error response bodies
Impact:GDPR violation with potential regulatory fines
FAQ

Common Questions

Have a specific question?

We're happy to discuss your platform, tech stack, and testing needs in a free 30-min discovery call, no commitment required.

Book a Free QA Strategy Call 
Free 30-min strategy call
Testing plan in 48 hours
No commitment required

REST, GraphQL, gRPC, SOAP, WebSocket, and event-driven APIs including Kafka, RabbitMQ, and SNS/SQS. We also test webhook delivery, third-party API integrations, and internal microservice communication.

Explore More

Related Platforms

All 9 PlatformsView QA Services

Case Study