Methods

Constants

DATETIME_REGEX = /\A(?:\d{4}-\d{2}-\d{2}|\d{4}-\d{1,2}-\d{1,2}[T \t]+\d{1,2}:\d{2}:\d{2}(\.[0-9]*)?(([ \t]*)Z|[-+]\d{2}?(:\d{2})?)?)\z/
DATE_REGEX = /\A\d{4}-\d{2}-\d{2}\z/
 

matches YAML-formatted dates

Class Public methods

decode(json)

Parses a JSON string (JavaScript Object Notation) into a Ruby object. See www.json.org for more info.

ActiveSupport::JSON.decode("{\"team\":\"rails\",\"players\":\"36\"}")
# => {"team" => "rails", "players" => "36"}
ActiveSupport::JSON.decode("2.39")
# => 2.39
Also aliased as: load
📝 Source code 
# File activesupport/lib/active_support/json/decoding.rb, line 24
      def decode(json)
        data = ::JSON.parse(json, quirks_mode: true)

        if ActiveSupport.parse_json_times
          convert_dates_from(data)
        else
          data
        end
      end
🔎 See on GitHub

dump(value, options = nil)

Alias for: encode

encode(value, options = nil)

Dumps objects in JSON (JavaScript Object Notation). See www.json.org for more info.

ActiveSupport::JSON.encode({ team: 'rails', players: '36' })
# => "{\"team\":\"rails\",\"players\":\"36\"}"

Generates JSON that is safe to include in JavaScript as it escapes U+2028 (Line Separator) and U+2029 (Paragraph Separator):

ActiveSupport::JSON.encode({ key: "\u2028" })
# => "{\"key\":\"\\u2028\"}"

By default, it also generates JSON that is safe to include in HTML, as it escapes <, >, and &:

ActiveSupport::JSON.encode({ key: "<>&" })
# => "{\"key\":\"\\u003c\\u003e\\u0026\"}"

This can be changed with the escape_html_entities option, or the global escape_html_entities_in_json configuration option.

ActiveSupport::JSON.encode({ key: "<>&" }, escape_html_entities: false)
# => "{\"key\":\"<>&\"}"
Also aliased as: dump
📝 Source code 
# File activesupport/lib/active_support/json/encoding.rb, line 40
      def encode(value, options = nil)
        Encoding.json_encoder.new(options).encode(value)
      end
🔎 See on GitHub

load(json)

Alias for: decode

parse_error()

Returns the class of the error that will be raised when there is an error in decoding JSON. Using this method means you won’t directly depend on the ActiveSupport’s JSON implementation, in case it changes in the future.

begin
  obj = ActiveSupport::JSON.decode(some_string)
rescue ActiveSupport::JSON.parse_error
  Rails.logger.warn("Attempted to decode invalid JSON: #{some_string}")
end
📝 Source code 
# File activesupport/lib/active_support/json/decoding.rb, line 45
      def parse_error
        ::JSON::ParserError
      end
🔎 See on GitHub