Superfluous "Stringification" and javax.json.stream.JsonParsingException

The following exception:

"javax.json.stream.JsonParsingException: JsonParser#getObject() or JsonParser#getObjectStream() is valid only for START_OBJECT parser state. But current parser state is VALUE_STRING"

...can be caused by a superfluous "stringification" of regular JavaScript strings, like e.g. JSON.stringify(aString)

The JSON-P parser expects: {"hey":"duke"} but gets: "{\"hey\":\"duke\"}"

To fix the problem, remove JSON.stringify(aString); and send the string directly to the MicroProfile server:

const payload = "{"hey":"duke"}";
const response = await fetch("http://localhost:8080/imports", {
    method: 'POST',
    body: payload,
    headers: {
        'Content-type':'application/json'
    }
});