Active Model Serializer formatting JSON display

I am using Active model serializer in my rails app and I want to refactor the display:

Whenever I go to http://localhost:3000/api/users/1 I see:

{"data":{"id":"1","type":"users","attributes":{"username":"Iggy1"},"relationships":{"items":{"data":[{"id":"1","type":"items"},{"id":"7","type":"items"}]},"lists":{"data":[{"id":"1","type":"lists"},{"id":"8","type":"lists"},{"id":"14","type":"lists"},{"id":"15","type":"lists"},{"id":"17","type":"lists"}]}}}}

How can I make it to look like:

{
    "data": {
        "id": "1",
        "type": "users",
        "attributes": {
            "username": "Iggy1"
        },
        "relationships": {
            "items": {
                "data": [{
                    "id": "1",
                    "type": "items"
                }, {
                    "id": "7",
                    "type": "items"
                }]
            },
            "lists": {
                "data": [{
                    "id": "1",
                    "type": "lists"
                }, {
                    "id": "8",
                    "type": "lists"
                }, {
                    "id": "14",
                    "type": "lists"
                }, {
                    "id": "15",
                    "type": "lists"
                }, {
                    "id": "17",
                    "type": "lists"
                }]
            }
        }
    }
}

I have spent a good amount of time browsing through adapters, rendering, architecture, but I couldn't find the guide. First off, is it possible to make it look like the second code block above? Second, if it is possible, what must I do to change the display?

api/users_controller.rb

   def show
     @user = User.find_by(id: params[:id])
     @no_user_found = User.all #other alternative when user ID not found?
     if @user.nil?
       flash[:notice] = "No user found"
       render json: @no_user_found, each_serializer: UserSerializer
     else
      render json: @user, each_serializer: UserSerializer
    end
   end

user_serializer.rb

class UserSerializer < ActiveModel::Serializer
   attributes :id, :username#, :email
   has_many :items, through: :lists
   has_many :lists
end

routes.rb

Rails.application.routes.draw do
  ActiveModelSerializers.config.adapter = :json_api
  namespace :api, defaults: { format: :json } do

     resources :users do
       resources :lists
     end

     resources :lists, only: [] do
       resources :items, only: [:create, :index, :show, :update]
     end

     resources :items, only: [:destroy]
   end
end

---

Instead of using browser, I suggest to use Postman pretty_generate .

You can render it with indentions and newline using the following below code:

<pre><%= JSON.pretty_generate(your_json_here) %></pre>

In your code above do it with:

<%
  require 'json'

  hash = JSON[{"data":{"id":"1","type":"users","attributes":{"username":"Iggy1"},"relationships":{"items":{"data":[{"id":"1","type":"items"},{"id":"7","type":"items"}]},"lists":{"data":[{"id":"1","type":"lists"},{"id":"8","type":"lists"},{"id":"14","type":"lists"},{"id":"15","type":"lists"},{"id":"17","type":"lists"}]}}}}.to_json] 
%>

<pre>
  <%=  JSON.pretty_generate(hash)%>
</pre>

---

Your question is about styling the json output. As @araratan suggested above you can use to only make readable for you. And there no necessary to make stylish to use in machine. if you need the same look in thGenerate preety json outpur

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