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JavaScript Asynchronous Programming with JavaScript Exploring Async/Await Async/Await Review

Posted by Hanwen Zhang
Hanwen Zhang
20,084 Points

what is the difference between json() and json.parse()?

not a specific question for this chapter... but a question that confused me overall regarding JSON.

also, if we use URL for the data that we need for JSON, what the file .json for?

In the end, why I get so confused by the AJAX ASYNC section? ><

Thanks

1 Answer

Peter Vann
Peter Vann
36,425 Points

Hi Hanwen!

The difference is:

json() is asynchronous and returns a Promise object that resolves to a JavaScript object. JSON. parse() is synchronous can parse a string to (a) JavaScript object(s).

Info taken from here:

https://stackoverflow.com/questions/48295439/json-parse-vs-json

Keep in mind JSON.parse() is used to turn AJAX response JSON data (sent as a string) into a JSON object in the response handler code, so the values can be extracted efficiently/expediently from the JOSN (via the object attributes or key/value pairs).

More on JSON.parse():

https://www.w3schools.com/js/js_json_parse.asp

Also, be aware of JSON.stringify which does the opposite. It converts a JSON object to a JSON string.

More on JSON.stringify:

https://www.w3schools.com/js/js_json_stringify.asp

More on JSON():

https://developer.mozilla.org/en-US/docs/Web/API/Body/json

BTW,

JSON() is used with fetch, whereas JSON.parse is used with AJAX.

More on Fetch vs AJAX:

https://www.xul.fr/en/html5/fetch.php

I hope I didn't overload you with links, but it's not a very simple or trivial subject (kind of complicated and involved!?!)

I hope that helps.

Stay safe and happy coding!

Hanwen Zhang
Hanwen Zhang
20,084 Points

Thank you for your information Peter