Bookmarklet to add or increase a query string by 1 (cachebuster). Useful when using caching layers that respect query strings (Cloudflare, Varnish)

CacheBuster.js

javascript:void((function () {
    var uri = location.href;
    var key = "cachebuster";
    
    var re = new RegExp("([?&])" + key + "=(.*)?(&|$)", "i");
    var separator = uri.indexOf('?') !== -1 ? "&" : "?";
    var matches = uri.match(re);

    if (matches) {
        location.href = uri.replace(re, '$1' + key + "=" + String(parseInt(matches[2])+1) + '$3');
    } else {
        location.href = uri + separator + key + "=0";
    }
})());

Expanded this function, https://stackoverflow.com/a/6021027