I wanted to know if JSON is still used in live applications? I am creating a service and want to understand if I should output data using JSON too?
What is the latest standard now?
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JSON is very popular, and there is no sign that this is changing.
You really need to ask the potential customers of the service that question. Or at least, give us some hint as to what the service is and what clients are likely to use it.
There is no official standard for JSON. In theory, JSON is a subset of ECMAScript (aka JavaScript), so the relevant ECMAScript standard would be normative.
In practice, JSON is implemented in many languages independently of ECMAScript. The description on the JSON.org website, and IETF RFC 4627 are probably the most relevant to someone implementing JSON for themselves, but neither of these sources have the authority of a standard. If you want JSON libraries, the JSON.org site is a good place to start looking.