javascript - Why is .json() asynchronous?

Question

This question already has answers here: question from:https://stackoverflow.com/questions/65884110/why-do-i-need-to-await-twice-when-im-waiting-for-one-promise-to-complete

Answer 1

After the initial fetch() call, only the headers have been read. So, to parse the body as JSON, first the body data has to be read from the incoming stream. And, since reading from the TCP stream is asynchronous, the .json() operation ends up asynchronous.

Note: the actual parsing of the JSON itself is not asynchronous. It's just the retrieving of the data from the incoming stream that is asynchronous.