One of my most used VSCode extensions at the moment is "Fix JSON". It fixes problems in JSON by running the broken JSON through jsonic. If you ever need to take a JS object dump (from an error stack trace, or a Redux state dump, etc) and turn it in to well formatted JSON it's very useful.
Because of issues like this, I find it absurd people use out-of-the-box JSON for human readable/writeable configuration. Issues with straight quotation marks, commas, brackets, and other stuff, and to top it off, there's no types so you often get terrible feedback on the configuration and every application needs to do similar marshaling to deal with it.
