![]() With the created Requests, you can use Parameters, Authorization, Headers, Body, Pre-request Script, and Tests. Before doing anything in Postman, it is good to have Swagger, where you can see all the available endpoints. You can also use it in the browser, whatever works better for you. The overview with Postman starts with setting up an application on your desktop. We won’t explain each and every one of them, however, for the sake of the example, we will stick to Postman. There are many tools used for API Testing – Katalon Studio, Postman, Apigee, JMeter, Rest-assured, Assertible, Soap UI, Karate DSL, Rest Console, API Fortress, Pyresttest, Hoppscotch, Taurus, Citrus Framework, and Airborne, just to name a few. Then, the Response is checked with a test. ![]() A Response, once received, should contain the code starting with 2**, which means that the Status is OK. The data is sent to the API endpoint through URL and the proper request type. The PUT Request creates or updates an existing resource at the endpoint.ĭELETE Request is used for deleting data on the endpoint. ![]() The POST Request is used for sending the data to the endpoint. The GET Request is used for getting the data from the joint URL (endpoint). The ones used most are the GET, POST, PUT, DELETE. The response is then compared with the expected results.Ī Request comes in a variety of types – GET, POST, PUT, PATCH, DELETE, COPY, HEAD, OPTIONS, LINK, UNLINK, PURGE, LOCK, UNLOCK, PROPFIND, and VIEW. After sending a Request, we should expect to receive a Response. API Testing is done by the URL, which calls the API endpoint. REST API Testing with PostmanĪPI Testing is used for validating APIs as it checks the functionality, reliability, performance, and security. Features of SOAP include standardisation and enhanced security, while the characteristics of REST are flexibility and efficiency. When deciding which protocol to use for building your API, you should consider the features or advantages you need the most. The most common REST HTTP requests are POST, GET, PUT, and DELETE. It also supports OpenAPI, Swagger and RAML formats. It structures its data in XML, YAML, and JSON and is data-driven. REST (Representational State Transfer) is based on HTML. SOAP (Simple Object Access Protocol) is based on XML and is function-driven. This is achieved with the inclusion of authorisation credentials needed for those Requests.ĪPI uses the most well-known protocols, such as SOAP, REST, and others. Thanks to this method of communication and data transfer, security is ensured. This method is based purely on the input and output of the application.ĪPI is used for communication between applications and works in the following way: Black Box means that there is no need to know about an internal code structure, paths, or any other details. API Testing can be done earlier as it is the kind of testing that does not need the UI, and it can be bypassed.ĪPI Testing can run on a service or business layer and can also run using the Black Box method. E2E Testing can be performed only when all three layers exist. Unit Testing is done on the business logic level. Typically, web applications are made of three layers: User Interface (UI), Business logic, and Database. API Testing provides insight to the eventual problem early in the Software Development Life Cycle (SDLC). Connecting applications through APIs simplifies data exchange between applications, resulting in higher productivity and revenue.ĪPI Testing is a complementary type of both: Unit Testing and End-to-End (E2E) Testing. Of course, the idea is far more complex, but I hope you get the point.ĪPI stands for “Application Programming Interface”. API can be compared to the walkie-talkie that enables two-way communication. Once he knows the answer, he presses a button and sends the weather information back to you. He hears your voice and checks whether it’s raining. You press that button, your voice reaches him, and you ask him if it’s raining outside. Imagine you have a walkie-talkie, and your friend is on the other end. In today’s article, we will focus on API Testing with an emphasis on the REST API and Postman. There are a lot of different combinations with various technologies and tools. What is more, they are the responsibility of a developer, not a QA Tester.Īfter the tests are conducted by a developer, it’s time for the QA team to test the functionality of an application’s interfaces. Unit Tests and Integration Tests are great to have, but they aren’t enough to test every aspect of the application. Hence, the Quality Assurance team must ensure that the application works the way it is expected to. Software development is facing tremendous growth – applications are increasingly in demand, releases are more frequent, and its quality must be maintained at an acceptable level.
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