The following page lists the available REST APIs:
https://cadsrapi-dev.cancer.gov/NCIAPIPortal/listAPIs
For example, the "Get Form Data with Collections" API accepts a Form ID and Protocol ID as input and returns all the components of the form: Form information, Modules, Questions, and Valid Values, including all instructions for each section of the form.
Example page (TBD: As of 2/1/22, this URL doesn't work.)
https://cadsr-dev.nci.nih.gov/caDSR/
Data Element Example
Forms Example
Forms Example with Protocol
REST API Example