Postman API client feature lets us send REST, SOAP, WSDL and GraphQL requests. Postman provides an Import feature, where we can paste raw CURL text and convert it into a request formatted with details like Request URL, headers, request body, query parameters and Authorization tokens. Let us take a closer look at these features. However, at a high-level there are a handful of core features that every API tester will need. From features like the Postman API and workflow controls to built-in monitors for regression testing, the tool has API testing covered. There is seemingly no end to the sheer quantity of features that Postman offers users. The results of load testing include understanding how those API endpoints respond and perform under load. On the other hand, load testing is like functional testing, but the difference is that load testing sets to test how those functionalities stand up to large numbers of concurrent users, or load. The results from functional testing are simply observing whether something worked or not. If developers move from functional testing to load testing without ensuring basic functions have been properly tested, it will throw off the load tests and results. Before APIs can be moved through the development cycle and tested further, it is important that the basic API functionalities are working. Load TestingĪs we briefly mentioned above, functional testing, or black-box testing, is primarily concerned with testing basic functions against a set of specifications and observing whether they work or not. Does it behave the same way as it is supposed to be? What about when it is not supposed to happen? And are the results what you would expect it to be? API testing is typically black-box testing, but to the extent that we have access to the results of the API’s actions beforehand and we know the expected response which needs to be validated.ĪPI Testing: Functional Testing vs. If we know that the API is supposed to perform a particular action, like update data, fetch data, delete data, make a change in data, the tests should check the results of those actions. The objective of API testing is to confirm right execution and validating if the API is getting, saving, or updating resources as intended. In API testing we use dedicated tools to send calls to the server hosting the API and retrieve the response. For that, you need a solution like LoadView, which we will talk about in more detail later in this article. It does not put the API under any sort of real stress, so it is not a good indicator of how your API will respond when real users are involved. While you will be able to run small, controlled tests that give you API response times, it is not the same as running a test under real world conditions. However, one thing that Postman is not is a performance testing tool. We can store each request in a collection, which later can be used to run all requests in order. Postman can also help appending scripts before the user sends the request and after obtaining the response. Enter the URL in the address bar and hit send to see the HTML (HyperText Markup Language) response. Postman not only provides us with an environment to work with APIs, but it can also be used to request web pages like a browser. Postman is an API development tool used in the software development life cycle: It is used as a companion tool to develop, document and test against an API and provides a user interface to make REST (Representational State Transfer) APIs server requests and shows the response from servers. We can leverage these features for continuous and automated testing. It provides a seamless user experience which helps in hitting API endpoints by quickly creating requests as per the API specification and dissecting the various response parameters like the status code, headers, and the actual response body itself. Postman is a popular API client tool which makes it easier for development teams to create, share, test, and document APIs.
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