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Output JSON instead of HTML

suggest change 
class UsersController < ApplicationController
  def index
    hashmap_or_array = [{ name: "foo", email: "foo@example.org" }]

    respond_to do |format|
      format.html { render html: "Hello World" }
      format.json { render json: hashmap_or_array }
    end
  end
end

In addition you will need the route: 

resources :users, only: [:index]

This will respond in two different ways to requests on /users: 

[
  {
    "name": "foo",
    "email": "foo@example.org"
  }
]

You can omit format.html { render inline: "Hello World" } if you want to make sure that your route will answer only to JSON requests.

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ActionController:
* ActionController
* Basic REST Controller
* Filters
* Generating a controller
* Rescuing ActiveRecord RecordNotFound with redirect to
* Controllers Basic
* Parameters
* Filtering parameters Basic
* Redirecting
* Using Views
* Output JSON instead of HTML
* Display error pages for exceptions
* when record not found
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72 Rails on docker
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