json 转 hash（MultiJson）

require ‘multi_json‘

MultiJson.load(‘{"abc":"def"}‘) #=> {"abc" => "def"}
MultiJson.load(‘{"abc":"def"}‘, :symbolize_keys => true) #=> {:abc => "def"}
MultiJson.dump({:abc => ‘def‘}) # convert Ruby back to JSON
MultiJson.dump({:abc => ‘def‘}, :pretty => true) # encoded in a pretty form (if supported by the coder)MultiJson.load(MultiJson.dump({:abc => ‘def‘}),:symbolize_keys => true)

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