That's not valid json, if you check the spec it says

A string is a sequence of zero or more Unicode characters, wrapped in 
+double quotes, using backslash escapes.

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allow_singlequote is a JSON::PP extension and just not worth using IMHO. The beauty of JSON is that it's simple & well defined, but if you use extensions then you'll break interoperability.

In reply to Re: Escaping quotes in JSON string by RichardK
in thread Escaping quotes in JSON string by HeadScratcher

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