Proper way to catch exception from JSON.parse

Question

I’m using JSON.parse on a response that sometimes contains a 404 response. In the cases where it returns 404, is there a way to catch an exception and then exec

Answer 1

We can check error & 404 statusCode, and use try {} catch (err) {}.

You can try this :

const req = new XMLHttpRequest();
req.onreadystatechange = function() {
    if (req.status == 404) {
        console.log("404");
        return false;
    }

    if (!(req.readyState == 4 && req.status == 200))
        return false;

    const json = (function(raw) {
        try {
            return JSON.parse(raw);
        } catch (err) {
            return false;
        }
    })(req.responseText);

    if (!json)
        return false;

    document.body.innerHTML = "Your city : " + json.city + "
Your isp : " + json.org;
};
req.open("GET", "https://ipapi.co/json/", true);
req.send();

Read more :

• Catch a 404 error for XHR