Setting parameters at the resource level enables the automatic assignment of the parameters to all methods within the resource. Any parameter value you specify at the higher resource level overrides the parameter value you set at the lower method level if the parameter names are the same. In contrast, the lower resource level parameters will not affect the higher API level parameters.

Consider our sample Phone Store API maintains a database of reviews about different phones. Here is a request to display information about a particular user review, 78 of the phone whose product code is 412456.

In the example, /user_reviews/78 parameter narrows the focus of a GET request to review /78 within a particular resource /phone-412456.

This parameter is specific to the particular resource phone whose product code is 412456 and to any individual methods that are directly below the particular resource. Such a parameter can be defined as a parameter at the resource level.