API & Microservices Performance Testing
Build performance tests from HTTP(S) API requests created directly in StresStimulus or captured from Postman. Turn individual requests and request sequences into test cases that can be replayed under load to evaluate the performance of API and HTTP-based microservices.
Tailor API Test Creation to Your Existing Workflow
Build HTTP(S) requests directly in StresStimulus with the Web API Test Builder, or capture requests sent from an API development and functional testing platform your team already uses. Both approaches create a repeatable performance test case.
Build API Requests in StresStimulus
Use the Web API Test Builder to create HTTP(S) requests directly. Enter the URL, query string, headers, and request body, or provide the entire request in raw format. Use HTTP methods such as GET, POST, and PUT with request types including REST and SOAP, then arrange the resulting sessions into a complete performance test case.
Capture Real API Traffic
If your team already uses an API development and functional testing tool such as Postman, StresStimulus can record the API request sequence it sends and convert the captured traffic into a performance test case. No API specification is required. StresStimulus also captures server responses to facilitate script Auto-Correlation and accurate test-run validation.
Web API Test Builder
Create and send HTTP(S) requests directly in StresStimulus.
API DEV/Testing Tool
Send requests from Postman or any other API Dev/testing tool while StresStimulus records the traffic.
Captured API Sessions
Use the created or recorded sessions as the source for the performance test.
Performance Test Case
Select the required sessions and convert them into a repeatable API performance test.
Turn API Requests Into Data-Driven Business Transactions
After creating an API test case, use StresStimulus to model realistic test scenarios. Group related API requests into transactions that represent complete business operations, then parameterize request values with dynamic test data.
Group Related API Requests Into Transactions
Combine one or more related API requests into transactions that represent meaningful business operations. For example, a transaction can include the API sequence required to authenticate a user, submit an order, or complete another multi-request operation. StresStimulus measures the transaction as a whole in addition to the individual requests.
Parameterize Requests with Dynamic Test Data
Replace fixed request values with realistic data that can vary by virtual user, iteration, or request.
Datasets
Supply different values to virtual users and iterations from reusable test datasets.
AI-Generated Synthetic Data
Generate realistic synthetic values for API request parameters in real time without manually creating large datasets.
Functions
Generate or transform parameter values dynamically during test execution.
Scriptable Variables
Use custom logic to calculate and control values required by API requests.
API Test Case
Start with a repeatable API workflow.
Create Transactions
Group related API requests into measurable business operations.
Parameterize Requests
Datasets · AI-Generated Data · Functions · Scriptable Variables
Run Under Load
Execute realistic API scenarios with virtual users.
Explore Related Topics
How It Works
See how StresStimulus turns test creation, configuration, execution, and analysis into one performance testing workflow.
Learn moreContinuous Testing & CI/CD
Run StresStimulus tests automatically in delivery pipelines and use performance criteria as automated quality gates.
Learn moreCloud & Distributed Load Testing
Distribute virtual users across on-premises or cloud load agents when additional load-generation capacity is required.
Learn moreEvaluate StresStimulus with Your API
Create a performance test from your own API requests and evaluate how StresStimulus fits your service-testing requirements.