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API Testing Services to Ensure Seamless System Integration and Performance
Deliver robust digital experiences with reliable, secure, and high-performing APIs tailored to meet your business goals.
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Why Choose Us for API Testing?

API testing is crucial for validating the functionality, reliability, and performance of backend services that power modern digital applications. At QAP Software Solutions, we understand that flawless integration isn’t just about endpoints—it’s about business continuity, system stability, and exceptional end-user experiences. Here’s why enterprises choose our API testing services:

Independent Validation Services

As an independent QA provider, we deliver objective and detailed API testing insights. This helps identify defects and inefficiencies that in-house teams may overlook, ensuring transparency and accountability.

Advanced Testing Techniques

Our approach includes both functional and non-functional testing methodologies—covering schema validation, status codes, response payload, security, performance, and edge case handling.

Experienced API Test Engineers

With expertise in REST, SOAP, GraphQL, and microservices architecture, our engineers bring industry-specific knowledge across domains such as healthcare, banking, e-commerce, and more.

Faster Time-to-Integration

Early testing of APIs helps uncover flaws before integration, allowing for smoother development workflows and faster release cycles.

Security & Compliance Assurance

We conduct OWASP-compliant API security testing and ensure alignment with data regulations like HIPAA, PCI-DSS, and GDPR.

Our API Testing Services

We offer a robust suite of API testing services tailored to your application architecture, integration layers, and digital ecosystem.

Functional API Testing

We validate each API endpoint to ensure it performs the intended operations with accurate request-response mechanisms.

  • ⇒ Parameter validation
  • ⇒ Model selection and tuningCRUD operation checks
  • ⇒ Schema validation and response format checks

Our automation engineers build and maintain scalable test suites to validate APIs across environments and versions.

  • ⇒ Tools: Postman, RestAssured, SoapUI
  • ⇒ CI/CD integration for continuous testing
  • ⇒ Automated test data and mock services

We identify vulnerabilities and ensure your APIs are resilient against threats like injection attacks, token leaks, and broken authentication.

  • ⇒ OWASP API Top 10 compliance
  • ⇒ OAuth, JWT, and token verification
  • ⇒ Rate limiting and throttling tests

We simulate real-world usage and analyze performance metrics under varying load conditions.

  • ⇒ Latency and throughput analysis
  • ⇒ Concurrent request simulation
  • ⇒ Monitoring backend and database response

Each time your APIs are updated, we rerun our regression test suite to catch unintended consequences.

  • ⇒ Maintain historical test cases
  • ⇒ Reduce risk of release delays
  • ⇒ Deliver version-ready APIs

Ensure reliability in loosely coupled systems using mocks and consumer-driven contract testing.

  • ⇒ Use tools like WireMock, Pact
  • ⇒ Test service interdependencies early
  • ⇒ Improve microservices coordination

Tech Stack We Use in API Testing

We use a combination of industry-standard and modern tools to ensure high-performance, scalable, and comprehensive API testing:

  • Testing Tools: Postman, SoapUI, RestAssured, Karate, JUnit
  • Automation Frameworks: Newman, TestNG, CI/CD with Jenkins, GitHub Actions
  • Mock & Contract Tools: WireMock, Pact, SwaggerHub
  • Security Testing: OWASP ZAP, Burp Suite, APIsec
  • Reporting & Metrics: Allure, ExtentReports, Elastic Stack dashboards

These tools empower us to test APIs across different environments with consistent accuracy, speed, and transparency.

Our Testing Process

Our API testing lifecycle is structured to align with your software development model—be it Agile, DevOps, or Waterfall:

Step 1
Requirement Analysis & Planning

We study the API specification, technical contracts, and business rules to define the testing strategy and priorities.

Step 2
Test Case Design & Review

Detailed test cases are written for each endpoint, including negative, boundary, and edge case scenarios.

Step 3
Test Execution

We execute tests manually or via automation suites. Logs, headers, payloads, and response codes are validated thoroughly.

Step 4
Regression & Automation

We update regression suites for ongoing releases and integrate them into CI pipelines to enable early issue detection.

Step 5
Final Reporting & Sign-off

We provide summary dashboards, defect logs, test coverage status, and compliance reports to aid Go/No-Go decisions.

Step 6
Continuous Learning & Improvement

Integrate user feedback and live data to retrain and enhance the model over time.

Industries We Serve

Our deep domain expertise and flexible testing strategies help us serve clients across a wide range of industries:

Healthcare & Life Sciences

EMRs, HL7/FHIR APIs, claims, and patient portals

Banking & Finance

Transaction APIs, account management, payment gateways

Retail & E-commerce

Inventory, catalog, order processing, and shipping APIs

Education

User authentication, grading systems, and content delivery APIs

Real Estate & PropTech

Listings, lead management, broker APIs

Travel & Hospitality

Booking, itinerary management, and third-party aggregator APIs

Client Success Stories

"QAP Software’s API testing expertise helped us streamline our fintech backend. They uncovered a security flaw that could’ve gone unnoticed. Their reporting and professionalism stood out."
VP Engineering
"By integrating automated API tests into our CI/CD pipeline, QAP reduced our integration testing cycle by 60%. Their API reporting helped us stay audit-compliant."
Global Health Platform

Frequently Asked Questions (FAQs)

What is API testing in software QA?

It ensures that the core functionality and behind-the-scenes data flow of the application are working correctly. It ensures backend services respond correctly, securely, and efficiently.

Depending on the number of endpoints and complexity, API testing typically ranges from 1 to 4 weeks.

Postman, RestAssured, SoapUI, JUnit, WireMock, and OWASP ZAP are commonly used.

Yes. We specialize in testing distributed systems and microservices using contract testing and mocks.

Absolutely. We work alongside your developers using Agile or DevOps workflows.

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