This application was created using ruby 2.3 and rails 5.1.
Run the rails server in development mode using bin/rails server, then open http://localhost:3000 in your browser.
By default, todos are rendered as HTML. To get JSON, either add application/json to the Accept header for the request or set the json=true query parameter. This will work for requests to the todo list (/users/:user_id/todos) or todo detail (/users/:user_id/todos/:id). You will need a valid session cookie to make any requests for todos.
If logged into the app in the browser just append the query parameter to the url:
http://localhost:3000/users/:user_id/todos?json=true
Or from the command line:
curl --cookie "_todo_rails_session=xxxx" --header "Accept:application/json" http://localhost:3000/users/10/todos