What Is Api Testing? 2021 Guide To Api Testing

To safeguard against this type of behavior, you need to build test cases that attempt to perform these types of malicious attacks. You can leverage your existing test cases to do so, because a scenario test can provide the attack vector into the application. You can then re-use this attack vector to launch your penetration attacks. A good example of this is combining different types of parameter fuzzing or SQL injection attacks with your scenario tests. That way, any changes that propagate through the application will be picked up by your security tests. To learn more about API security testing, check out my colleague’s helpful blog post.

Load test your API with hundreds of simulated concurrent connections. While some end-to-end functional GUI tests will be needed to verify if UI elements appear correctly and can be interacted with, API tests are much faster and more reliable. There are also a few best-practices to be aware of that can guide you in your conversations with potential partners and help you get a sense of who knows their stuff. For example, at the beginning of your program, identify the requirements of the testing. This includes the API’s purpose, the workflow of the application, and where the API sits in that workflow. This step helps you define the verification approach and prepare your test data for input and output. An API is essentially a contract between the client and the server or between two applications.


You may have prescribed techniques for combining these blocks together, but customers can have unpredictable desires, and unexpectedly combine APIs together to expose a defect in your application. To safeguard against this, you want to create many scenario tests with different combinations of APIs to bulletproof your application against a critical breakdown. This allows different developers from different organizations in different parts of the world to create highly-distributed applications while re-using the same APIs. Click Send to submit your API request, check the returned API status code, response time, and content. ReqBin API testing tool provides millisecond precision timings for API requests. This hands-on workshop will give you the required knowledge to kick-start your automated API testing using Karate, an open-source testing tool. Most of the high-end API testing tools offer solutions for execution of these nonfunctional test types.

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So when you have a weekend ahead, leave automated soak tests running. On Monday, it will show you whether any unwanted behavior has emerged. We’ve also elaborated on the basics of software quality management.

Essential Api Testing Automation Best Practices

As mentioned previously, the approach for API testing is different when compared to the approach followed while testing GUI based applications. As testers, we need to know the expected api testing best practices results to effectively test an application. This is often a challenge, as in order to know the expected results, we need to have clear precise requirements – which is not the case.

#3) APIs allow easy integration with the other systems both for supported standalone applications as well as with API based software products. Before Shift Left Testing was introduced, software testing came into picture only after the coding was complete and code was delivered to the testers. This practice led to Programmer the last minute hustle to meet the deadline and it also hampered the product quality to a great extent. With Katalon, you can test all types of REST, SOAP/1.1 and SOAP/1.2 requests and multiple data sources. RestSharp’s functionality allows for straightforward test creation, serialization and deserialization.

What Is Headless Testing

For these tests, error reporting and monitoring tools will help you analyze traffic to identify trends in service spikes. REST API Testing is open-source web automation testing technique that is used for testing RESTful APIs for web applications.

practice api testing

You can see the information for any API request by clicking on it. This is the same data available when you copied the URL from the browser. Furthermore, the response headers and the request placed can also be checked. Next, you must take part of the URL, beginning with the “question mark” and use it to assign the parameters. To download JMeter, you will need to access the Apache JMeter website and download the file. To know the entire download and installation process for JMeter, you can check this JMeter Download and installation video. For example, If you are booking a flight, you begin the process by searching online for flights that match your destination, departure, return dates, and many other related filters.

Is There A Dummy Api For Testing

Remember to include your development and QA teams in this discussion. And, if those colleagues are already familiar with such tools, they’ll be able to discuss a product’s advantages and limitations. Ensure staff has sufficient security access to execute tests, and know how to access the APIs directly and through the application. List every API your organization uses, and prioritize them in order of their importance to applications and customers.

practice api testing

It costs a pretty penny – for individual users $599/year and for CI teams – $4,190/year, including Docker Support. The Requests library saves time and effort by fully automating keep-alive and HTTP connection pooling. No need to manually add query strings to URLs and form-encode POST data. Igor Pavlenko considers Requests a powerful library with easy-to-understand documentation, simple syntax, and rich functionality. They vary depending on the programming language they’re based on.

Api Test Strategy

Performance Testing is used to embed API tests into a CI/CD pipeline used by developers to create the base code of an application. This helps identify any potential API issues early in the software development lifecycle. This process runs a single request to a single endpoint, looking for a single response or set of responses. This type of testing is handy when trying to pinpoint the cause of an API issue. We execute requests via the API and verify the actions through the web app UI and vice versa. The purpose of these integrity test flows is to ensure that although the resources are affected via different mechanisms the system still maintains expected integrity and consistent flow.

practice api testing

DropX.io API provides programmatic access to the e-commerce intelligence data. Analyzes the performance of a web page and provides tailored suggestions to make that page faster. With the Times Newswire API, you can get links and metadata for Times articles and blog posts as soon as they are published on NYTimes.com. The Times Newswire API provides an up-to-the-minute stream of published items.

You should also avoid testing more than one API in a test case. It is painful if errors occur because you will have to debug the data flow generated by API in a sequence. There are some cases in which you need to call a series of API to achieve an end-to-end testing flow. However, these tasks should come after all APIs have been individually tested. All API response status codes are separated into five classes in a global standard. The first digit of the status code defines the class of response.

  • We later extend positive tests to include optional parameters and extra functionality.
  • Web UI testing – Performed as part of end-to-end integration tests that also cover APIs, enables teams to validate GUI items in the context of the larger transaction.
  • Once again as we talked about earlier there are many ways to validate a REST response.
  • Whether you develop an application, migrate to the cloud, or even test software, planning is at the heart of every project.
  • Another benefit of scenario testing is the ability to validate expected behavior when your APIs are being used in ways that you did not expect.

Ideally an organization performs all manner of API tests continuously, but that’s not always feasible. As a guide, run security tests as often as possible every day, while other tests such as error handling can be done less frequently. In certain cases, you may need a security expert to help design the security-related API tests and select the preferred tool to use. For the remainder of the tests, nearly any standard tool will work.

We should follow actual user flows and create integration tests rather than testing individual endpoints in thin air, wherever possible. Performance testing is usually relegated to the end of the testing process, in a performance-specific test environment. This is because performance testing solutions tend to be expensive, require specialized skill sets, and require specific hardware and environments. This is a big problem because APIs have service level agreements that must be met in order to release an application. If you wait until the very last moment to do your performance testing, failures to meet the SLAs can cause huge release delays. Test API endpoints by making API requests directly from your browser.

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