JSON encode / decode comparison

json_decode.rb

# Result
#valid
#{"k"=>"vvv"}
#{"k"=>"vvv"}
#{"k"=>"vvv"}
#invalid utf-8 with US-ASCII
#{"k"=>"v\xFFvv"}
#{"k"=>"v\xFFvv"}
#"Yajl: error: lexical error: invalid bytes in UTF8 string.\n                             #   {\"k\":\"v\xFFvv\"}\n                     (right here) ------^\n"

require 'json'
require 'oj'
require 'yajl'

json = "{\"k\":\"vvv\"}"

puts "valid"

begin
  p JSON.parse(json)
rescue => e
  p "JSON: error: #{e}"
end
begin
  p Oj.load(json)
rescue => e
  p "Oj: error: #{e}"
end
begin
  p Yajl.load(json)
rescue => e
  p "Yajl: error: #{e}"
end

json = "{\"k\":\"v#{0xff.chr}vv\"}"

puts "invalid utf-8 with US-ASCII"

begin
  p JSON.parse(json)
rescue => e
  p "JSON: error: #{e}"
end
begin
  p Oj.load(json)
rescue => e
  p "Oj: error: #{e}"
end
begin
  p Yajl.load(json)
rescue => e
  p "Yajl: error: #{e}"
end

json_encode.rb

# Result
#valid
#"{\"k\":\"vvv\"}"
#"{\"k\":\"vvv\"}"
#"{\"k\":\"vvv\"}"
#invalid utf-8 with US-ASCII
#"JSON: error: \"\\xFF\" from ASCII-8BIT to UTF-8"
#"{\"k\":\"v\xFFvv\"}"
#"{\"k\":\"v\xFFvv\"}"

require 'json'
require 'oj'
require 'yajl'

json = {"k" => "vvv"}

puts "valid"

begin
  p JSON.dump(json)
rescue => e
  p "JSON: error: #{e}"
end
begin
  p Oj.dump(json)
rescue => e
  p "Oj: error: #{e}"
end
begin
  p Yajl.dump(json)
rescue => e
  p "Yajl: error: #{e}"
end

json = {"k" => "v#{0xff.chr}vv"}

puts "invalid utf-8 with US-ASCII"

begin
  p JSON.dump(json)
rescue => e
  p "JSON: error: #{e}"
end
begin
  p Oj.dump(json)
rescue => e
  p "Oj: error: #{e}"
end
begin
  p Yajl.dump(json)
rescue => e
  p "Yajl: error: #{e}"
end