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Doesn't really matter, use whatever you prefer, but stick to your decision!
Before I got into NodeJS, I used PHP extensively. In PHP, there is a difference between single and double quotes. I preferred single-quotes then and carried the habit on to JS.
Later, I found out about the Google JS Style Guide, which tells you to prefer single quotes. Since I mostly agree with that style guide, I always use single quotes (or template strings).
@avirajkhare00 for JSON, it is not "should", but "must". As per standard, JSON only allows double quotes:
