We don't need to set config.debug_exception_response_format given that :api is...

We don't need to set config.debug_exception_response_format given that :api is the default value for only API apps

railties/lib/rails/generators/rails/app/templates/config/environments/development.rb.tt

@@ -23,12 +23,6 @@ Rails.application.configure do
     config.action_controller.perform_caching = false
     config.cache_store = :null_store
   end
-  <%- if options[:api] -%>
-
-  # Return error responses in the format requested by the client
-  # or default to JSON format.
-  config.debug_exception_response_format = :api
-  <%- end -%>
   <%- unless options.skip_action_mailer? -%>
 
   # Don't care if the mailer can't send.

railties/test/generators/api_app_generator_test.rb

@@ -48,10 +48,6 @@ def test_api_modified_files
       assert_match(/config.api_only = true/, content)
     end
 
-    assert_file "config/environments/development.rb" do |content|
-      assert_match(/config.debug_exception_response_format = :api/, content)
-    end
-
     assert_file "config/initializers/cors.rb"
 
     assert_file "config/initializers/wrap_parameters.rb"