Setup stand alone api

Gemfile

@@ -43,3 +43,5 @@ end
 gem 'tzinfo-data', platforms: %i[mingw mswin x64_mingw jruby]
 
 gem "rack-cors", "~> 1.1"
+
+gem "fast_jsonapi", "~> 1.5"

Gemfile.lock

@@ -83,6 +83,8 @@ GEM
     crass (1.0.6)
     diff-lcs (1.3)
     erubi (1.9.0)
+    fast_jsonapi (1.5)
+      activesupport (>= 4.2)
     ffi (1.12.2)
     ffi (1.12.2-x64-mingw32)
     globalid (0.4.2)
@@ -252,6 +254,7 @@ DEPENDENCIES
   bootsnap (>= 1.4.2)
   byebug
   capybara (>= 2.15)
+  fast_jsonapi (~> 1.5)
   jbuilder (~> 2.7)
   listen (>= 3.0.5, < 3.2)
   mdl_form!

app/controllers/api/v1/base_controller.rb

+class Api::V1::BaseController < ActionController::API
+end
\ No newline at end of file

app/controllers/api/v1/users_controller.rb

+class Api::V1::UsersController < Api::V1::BaseController
+    def index
+      users = User.all
+   
+      render json: UserSerializer.new(users).serialized_json
+    end
+   
+    def show
+      user = User.find(params[:id])
+   
+      render json: UserSerializer.new(user).serialized_json
+    end
+  end
\ No newline at end of file

app/serializers/user_serializer.rb

+class UserSerializer
+  include FastJsonapi::ObjectSerializer
+  attributes :name, :email
+end

config/routes.rb

@@ -9,4 +9,10 @@ Rails.application.routes.draw do
   get 'static/help'
   get 'static/privacy'
   root to: 'static#home'
+
+  namespace :api do
+    namespace :v1 do
+      resources :users, only: [:index, :create, :show, :update, :destroy]
+    end
+  end
 end