How do you test REST APIs?
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Testing REST APIs involves verifying that the endpoints function correctly, return the expected responses, and handle errors gracefully. The process starts with requirement analysis, where you understand the API specifications such as endpoints, HTTP methods (GET, POST, PUT, DELETE), input parameters, headers, and expected outputs. The first step is functional testing, where you check if the API returns correct data for valid inputs. You then move to negative testing by sending invalid data, missing parameters, or wrong headers to ensure proper error handling.
Next comes integration testing, where APIs are tested in combination with other services or modules to ensure smooth data flow. Validation testing ensures response formats (JSON, XML) follow the agreed schema, and status codes (200, 201, 400, 401, 500, etc.) are accurate. Performance testing is also crucial to measure response time, scalability, and throughput under different loads. Security testing checks for vulnerabilities like SQL injection, authentication bypass, or data leaks, ensuring endpoints require proper tokens and encryption.
Automation tools such as Postman, Rest Assured, or JMeter can be used for regression, load, and automated functional testing. Logging and monitoring help validate real-time usage. Finally, thorough documentation testing ensures that the API behaves exactly as described in API docs, enabling developers to integrate it smoothly.
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