Add a Default Format to Routes in Rails

When routing in Rails

# config/routes.rb

resources :users

sure you can respond to say json by going to the format directly (/users.json). What if you want that to always be the format without requesting it in the url? Normally by default we would get HTML if we declare nothing.

Turns out you can pass a defaults option to your routes with format being one of the things that can be accepted.

# config/routes.rb

resources :users, defaults: {format: :json}

Now requesting /users will render the json response as well as /users.json.