Note that it should be easy to create this as most can be generated from the code.
Look at the examples below to help you:
java docs example (Links to an external site.). - sqlrest
web api example (Links to an external site.) – trello
api (Links to an external site.) - geogig
php docs example (Links to an external site.) – laravel
protocol example (Links to an external site.) – http
node example (Links to an external site.). – socket.io