Parsing JSON is synchronous, but fetch itself doesn’t read the body data. > [1] to parse the body as JSON, first the body data has to be read from the incoming

Parsing JSON is synchronous, but fetch itself doesn’t read the body data. > [1] 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. [1] https://stackoverflow.com/a/59555579 https://stackoverflow.com/a/59555579