![]() ![]() You will need a basic server to return the appropriate data for your mock calls. Your text file will need to emulate the same structure of fields that the real API will return. Typically, response formats are JSON or XML, so you’ll need to be familiar with the syntax. With the static approach, you can grab a response from an existing or similar API and then make edits manually. However, if you need to quickly create a mock API by hand, you can connect it to a basic web server. The downside of this approach is returned data is potentially repetitive and outdated, which breaks down the illusion of real data. The most basic way to create a mock API server or mock REST API is to use static responses which we will cover in this advanced dummy mock API data definition, mock data definition and dummy web service APIs for testing guide. Keep in mind, you’ll want another method for ensuring that API responses meet expectations, such as API contract testing. A mock API server or library can return anticipated results so you can unit test the rest of your code. When your tests run with every deploy, you may not want to wait for dozens of live calls to an external API. You might also mock API calls for unit testing. Or, use mock data responses if live calls to an API would incur a charge from the provider. For example, you can use a local mock server to fake results from a public API when you aren’t connected to the Internet. You can also use mock APIs to emulate APIs you don’t control. This fast feedback loop can make engineering teams much more efficient. As an added benefit, the backend team can discover where the mock API doesn’t meet the developer’s needs without spending developer time on features that may be removed or changed. This API mocking guide shows how a mock API server allows developers to consume a working API with the same interface as the eventual production API. Often with internal projects, the API consumer (such as a front end developer through REST APIs) moves faster than the backend team building the API. ![]() Our mock API server guide for testing covers how you can use a mock API server so the absence of a real API doesn’t hold you back. While designing an API, you can use mock APIs to work concurrently on the front and back-end, as well as to gather feedback from developers. A mock API server is useful during development and testing when live data is either unavailable or unreliable.
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