3xx (Redirection): Further action needs to be taken to complete the request.2xx (Successful): The request is successfully received, understood, and accepted.1xx (Informational): The request is received and continues to be processed.There are five values for the first digit: The last two digits do not have any class or categorization role. The first digit of the status code defines the class of response. However, it does not reflect all test scenarios of the API.Īll API response status codes are separated into five classes (or categories) in a global standard. Verifying if the response code equals to 200 or not to decide whether an API testing is passed or failed is familiar to new API testers. The most common API output you need to verify in API testing is the response status code. The output of the “Get user” API can be used as the input of the “Update user” API, and so on. For example, for some APIs, you will verify the responses against the database and for some others, it is better to verify the responses against other APIs.įor example, the output of the “Create user” API will be the input of the “Get user” API for verification. In addition, this step also helps you define the verification approach. Knowing the purpose of the API will set a firm foundation for you to well prepare your API testing data for input and output. Generally, APIs of an application are used to manipulate its resources in reading (GET), creating (POST), updating (PUT) and deleting (DELETE). What is the workflow of the application and where is the API in that flow?.For example, for some APIs, you will verify the responses against the database and for some others, it is better to verify the responses against other APIs. This step also helps you define the verification approach. Knowing the purpose of the API will set a firm foundation for you to well prepare your test data for input and output. Understand API requirementsīefore testing your APIs, you need to answer these questions to thoroughly understand the API’s requirements: Here are 10 basic tips that you need to know for API testing: 1. Unlike SOAP-based Web services, there is no official standard for RESTful Web APIs. REST (REpresentational State Transfer) is the web standards-based architecture that uses HTTP. SOAP (Simple Object Access Protocol) is a standard protocol defined by the W3C standards for sending and receiving web service requests and responses. There are two broad classes of web services for Web API: SOAP and REST. It is a part of integration testing that determines whether the APIs meet the testers’ expectations of functionality, reliability, performance, and security. An API is essentially the “middle man” of the layers and systems within an application or software.ĪPI (application programming interface) testing is performed at the message layer without GUI.
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