Requires ASA 9.3(1) or higher which requires the 5500-X line or ASAv.

Initial Configuration

Download the .spa file from cisco.com. Place it on the ASA. Then enable ASDM and the rest-api.

aaa authentication http console TACACS+ LOCAL
http server enable
http 192.168.1.0 255.255.255.0 INSIDE
rest-api image disk0:/asa-restapi-111-lfbff-k8.SPA
rest-api agent

Documentation

You can view documentation of the API and test that the API is working by going to the following URL (replace the IP with your ASA IP).

https://192.168.1.1/doc

To properly view the documentation, your computer needs access to the internet to download specific resources like jquery.