JsonTextWriter produces invalid JSON when Unicode char \u201d present in string about newtonsoft.json

[elgonzo]

Not a bug in Newtonsoft.Json. Newtonsoft.Json produces valid JSON and does not change the \u201d character to the \u0034 double quote.

What you see there is either an effect of the console doing the conversion if it is not using Unicode/UTF as a code page and/or the Console.Out TextWriter having a non-Unicode/non-UTF text encoding assigned, or perhaps a conversion happening by you perhaps copy'n'pasting the the console output into an editor or something.

I suggest you test in a more controlled manner eliminating any possible environmental factors that potentially can have an impact on how the text is being outputted/presented. In this case for example, instead of writing to Console.Out, write into a StringWriter. Then, after finishing writing the json data to the StringWriter, obtain the string from it and print out the ordinal value of the character (cast the char value to an int) at the string position of the right double quote \u201d to see that the \u201d character is not being substituted by Newtonsoft.Json.