What type of parameter includes a key-value format for API requests?

• A. Path Parameter
• B. Request Parameter
• C. Authorization Parameter
• D. Query Parameter

Answer: (D)

The correct choice is query parameter. Query parameters are used in URL query strings to pass data in a key-value format. They are typically added to the endpoint of a web API request after a question mark and separated by ampersands. For example, in the URL https://api.example.com/items?category=books&sort=asc, category and sort are the keys, while books and asc are their corresponding values.

Query parameters allow clients to filter or modify the data they receive from the server, making them essential for crafting flexible API requests. This is particularly useful for implementing features like pagination, sorting, and searching, ensuring that only the required data is returned to the user.

Other types of parameters, such as path, request, and authorization parameters, serve different purposes. Path parameters are embedded in the URL path for specifying particular resources but do not utilize the key-value format. Request parameters are a broader category that can include both body and query parameters, but in the context of key-value pairs, query parameters are the most relevant. Authorization parameters generally deal with authentication and do not fit the key-value scheme as part of the URL structure used in requests.