Allow serialization with Single Quotes \' in stead of Standard Double Quotes \"

[anismek]

Adding something like this feature JsonWriteFeature.USE_SINGLE_QUOTE. Permitting to serialize:
{"name": "value"} to {'name': 'value'} and if also JsonWriteFeature.QUOTE_FIELD_NAMES is disabled to {name: 'value'}.
I know this is not standard JSON, but might be really helpful to get TypeScript-formatted JSON.

[cowtowncoder]

There is a PR already for this (see #235) but I think I can move this as an RFE for jackson-core to match.

[anismek]

@cowtowncoder thanks !

[srgg]

Any chance to get this merged into the base line?

[cowtowncoder]

I am hoping to get this merged to be included in 2.12.0, but unfortunately there is lots of work and this is not one of priority items.

[srgg]

@cowtowncoder np, thank you for your work

[cowtowncoder]

Thank you! Let's hope it makes it in -- it is included on my long todo list:

https://github.com/FasterXML/jackson-future-ideas/wiki/Jackson-Work-in-Progress

[harsh201]

@cowtowncoder I am new here and would like to pick this one.

[cowtowncoder]

@harsh201 excellent! Make sure to start with 2.12 branch. Also PR #235 is pretty good; I'd make only couple of small changes.

[angelyan]

@cowtowncoder is this not possible already in 2.12 with new JsonFactoryBuilder().quoteChar('\'').build()?

[cowtowncoder]

@angelyan ... and you are absolutely right, it is.

Sometimes I surprise myself by rediscovering something I already implemented... and not all that long ago. :-D

Issue was #549 and is a superset: can use apostrophe or any other ASCII character (if that was necessary).

[angelyan]

@cowtowncoder I think there's something missing, though. Shouldn't singles quotes be escaped and double quotes be left as is here?

jackson-core/src/test/java/com/fasterxml/jackson/core/json/CustomQuoteCharTest.java

Line 78 in 2e11f0c

assertEquals("{'key':'It\\u0027s \\\"fun\\\"'}", w.toString());

[cowtowncoder]

I am sure there are different preferences; some might prefer minimal escaping, others keeping both.
It probably seemed safer not to assume that double-quotes should be kept quoted.

If there is some follow-up improvements needed, filing a new issue is always possible.