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Are there any forbidden characters in key names, for JavaScript objects or JSON strings? Or characters that need to be escaped?
To be more specific, I’d like to use “$”, “-” and space in key names.
No. Any valid string is a valid key. It can even have
"as long as you escape it:There is perhaps a chance you’ll encounter difficulties loading such values into some languages, which try to associate keys with object field names. I don’t know of any such cases, however.