Create cards via API

app/controllers/cards_controller.rb

@@ -10,8 +10,17 @@ class CardsController < ApplicationController
   end
 
   def create
-    card = @board.cards.find_or_create_by!(creator: Current.user, status: "drafted")
-    redirect_to card
+    respond_to do |format|
+      format.html do
+        card = @board.cards.find_or_create_by!(creator: Current.user, status: "drafted")
+        redirect_to card
+      end
+
+      format.json do
+        card = @board.cards.create! card_params.merge(creator: Current.user)
+        head :created, location: card_path(card, format: :json)
+      end
+    end
   end
 
   def show

app/views/cards/show.json.jbuilder

@@ -0,0 +1 @@
+json.partial! "cards/card", card: @card

test/controllers/api_test.rb

@@ -40,6 +40,14 @@ class ApiTest < ActionDispatch::IntegrationTest
     assert_equal "My new board", @response.parsed_body["name"]
   end
 
+  test "create card" do
+    post board_cards_path(boards(:writebook), format: :json), params: { card: { title: "My new card" } }, env: @davids_bearer_token
+    assert_equal card_path(Card.last, format: :json), @response.headers["Location"]
+
+    get card_path(Card.last, format: :json), env: @davids_bearer_token
+    assert_equal "My new card", @response.parsed_body["title"]
+  end
+
   private
     def bearer_token_env(token)
       { "HTTP_AUTHORIZATION" => "Bearer #{token}" }