Can you try to format your code better? It is very hard to read right now. Use code blocks surrounded by ``` (or just use the button) so they are formatted nicely for you like this:
function something(someargument) {
console.log('hello', someargument);
}
Secondly, I don’t understand your question. Are you asking how to read json and change it? Are you getting any errors with the decodePayload function? Or are you just asking a regular javascript question? If you are just asking how to print a javascript object as a nicely formatted string (which is what I think you mean?) then I would suggest starting a javascript tutorial somewhere. Quick hit on google: JavaScript Objects
You’d probably want something like
console.log(msg.payload.objectJSON);