API Testing Service

Ensuring the reliability and performance of your Application Program Interface
for flawless functionality during heavy traffic, and critical demands.

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API Testing customized according to your business logic

200x faster and more versatile than any UI tests, our API (Application Programming Interface) testing generates actionable results, determining the functionality and security of your API. Identifying your business needs for better customization of API testing strategies, utilizing accurate and specific models of validation.
  • Get your API ready for all kinds of web and app functionality through Automated API Testing
  • Improve the performance and scalability of your software with case-specific API solutions.

Why is API Testing Important?

Ensure better functionality and reliability with API testing

API testing is crucial for an error-free operation of your Application Program Interface at the later stage of development. Along with the functionality of your API, it also aims to ensure the performance, reliability, and security of your API, during an array of requests.

  • 01

    Checks the functionality of every individual system component, making the identification of all forms of problems easier.

  • 02

    Reduces the high cost of rewriting a large number of codes later or rectifying system functionality.

  • 03

    Quicker and more convenient compared to other tests. Can be run only within seconds.

A team having a discussion on API testing

Why choose us

Performance-based API
end-to-end testing

Along with verifying your API for central functional and technical defects, our API testing also focuses on your business strategy to cater to the particular functional situations that your application will face. Merging your business priorities with the latest software testing tools, we give you the overall review to beget innovative and comprehensive solutions.

  • Reduce your software testing costs by 25-15%.
  • Faster results and sustainable improvements at the earlier stage
  • Latest testing tools and libraries for quick reports.

Types of API Testing Services we offer

  • API Performance iconAPI Performance Testing
  • API Automation iconAPI Automation Testing
  • API Security iconAPI Security Testing
  • API Integration iconAPI Integration Testing
  • API Functional iconAPI Functional Testing
  • API Load iconAPI Load Testing
  • API Regression iconAPI Regression Testing
  • Negative iconNegative Testing
  • API Reliability iconAPI Reliability Testing

Our API Testing Process

  • Test Plan & Strategy

    Identifying the purpose and expectations.

  • Design Test Cases

    Defining the target consumer and requirements

  • Test Case Development

    Enabling parameters for the verification of functionality

  • Develop Automated Test Scripts

    Using libraries and tools to automate API testing.

  • Test Execution

    Executing the automated scripts.

  • Produce Test Report

    Review reports depending on the tools utilized.


Tell us about your project

Our executives will reach out to you to understand your needs


Expertise in testing tools

As a leading API testing company, Crestech uses API testing tools that look out for both functional and non-functional aspects of API testing and provides the parameters and strategies for projects of all dimensions and priorities.

With the latest API tools, we produce automated tests for your API, defining specific inputs. Ensuring performance, reliability, and security, our tools maximize the functionality of your software.

  • Postman
  • Katalon_Studio_Logo
  • Jmeter
  • Advance-Rest-Client
  • Rest-Assured
  • Soapui

We test applications that run on different platforms

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Advantages of our API Testing Services

With API testing, we reduce the possibilities of defect detection at some later stage found in the core coding of the application. Minimum rectification work during real-time operation.

Bugs at all levels of the software get easily detected and eliminated at the very early stages of development, hence reducing extra costs for rectification.

API testing needs less coding compared to UI or other automated testing suits, minimizing the costs.

API testing can be performed early on in the development cycle of the application, quickening the development process. Moreover, API testing in general is less time-consuming than other tests.

Being language-independent, API tests allow the quality assurance team to select any programing language that is suitable for the specific technology.