You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: json.rb
    path of file: ./repos/ruby-oembed/lib/oembed/formatter
    
    the code of the file until where you have to start completion: module OEmbed
  module Formatter
    # Handles parsing JSON values using the best available backend.
    module JSON
      # A Array of all available backends, listed
    
        def set_default_backend
          DECODERS.find do |name|
            begin
              self.backend = name
              true
            rescue LoadError
              # Try next decoder.
              false
            end
          end