How to "Pretty" Format Json Output in Ruby on Rails

How to pretty format JSON output in Ruby on Rails

Use the pretty_generate() function, built into later versions of JSON. For example:

require 'json'
my_object = { :array => [1, 2, 3, { :sample => "hash"} ], :foo => "bar" }
puts JSON.pretty_generate(my_object)

Which gets you:

{
  "array": [
    1,
    2,
    3,
    {
      "sample": "hash"
    }
  ],
  "foo": "bar"
}

Pretty format my JSON output in Rails 4

As the error suggest, only generation of JSON objects or arrays allowed. I guess you should try this.

@celebrities = Celebrity.includes(:category)    
respond_to do |format|
  format.json { render json: JSON.pretty_generate(JSON.parse(@celebrities.to_json(:include =>{:category => {:only => [:category]} })))}
end

Rails: Pretty print JSON without overkill

Use this helper method built into JSON.

JSON.pretty_generate

I just tried and it works:

> str = '{"error":{"type":"unauthorized","message":"This page cannot be accessed without a valid API key."}}'
> JSON.pretty_generate(JSON.parse(str))
 => "{\n  \"error\": {\n    \"type\": \"unauthorized\",\n    \"message\": \"This page cannot be accessed without a valid API key.\"\n  }\n}"

Rails 4 Pretty JSON output

That's probably your browser being nice to you. There are lots of extensions for Chrome and Firefox that will automatically format your JSON for you:

• Chrome: JSON Formatter
• Chrome: JSON Viewer
• Firefox: JSONView
• Firefox: JSONovich
• Safari JSON Formatter

You don't really want Rails to handle the pretty printing for you since that would dramatically increase the size of your JSON responses.

How can I prettify json output for ActiveAdmin?

I would go with something like this:

show do
  attributes_table do
    row :source_json do |model|
      JSON.pretty_generate(JSON.parse(model.source_json))
    end
  end
end

You might not need the JSON.parse call if you have an option to get source as a Ruby hash instead of a JSON string.

You might want to wrap the output into a <pre> HTML tag – like Evan Ross suggested – to improve readability:

show do
  attributes_table do
    row :source_json do |model|
      tag.pre JSON.pretty_generate(JSON.parse(model.source_json))
    end
  end
end

How to properly format json to send over using RestClient

You should put all your params in one params hash like this:

  params = {
    recipient: { id: sender },
    message: { text: text },
    access_token: page_token
  }

  response = RestClient.post base_uri, params.to_json, content_type: 'application/json', accept: 'application/json'
  p "this is the response #{response}"

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