Checks for status of all linked internal pages on the current page. SEO Scripts.

checkInternalLinksStatus.js

(async function() {

const getStatus = async (u) => {    
    let response;
    try {
        response = await fetch(u, {method: 'HEAD'})
    } catch (err) {
        console.log("%cProbably OK, but forbidden, do a manual check", "font-size:11px;color:red;")
        return 0;
    }
    return response.status;
}

async function check404() {    
    clear();

    const links = document.querySelectorAll("body a");
    const base = `${window.location.protocol}//${window.location.hostname}`;
    
    let valid = [];

    links.forEach((l) => {
        let href = l.getAttribute("href");

        if (!href) { return };

        if (href.startsWith(base)) {            
            valid.push(href.trim());            
        } else if (
            href.startsWith("/") 
            || (href.match(/^[a-zA-Z0-9]/gi) !== null && !href.includes(":"))
        ) {
            href = new URL(href, base);
            valid.push((href.toString()).trim());            
        } else {            
            console.log(`%cProbably not a link to this site/subdomain/domain: ${href}`, "font-size:12px;color:red;padding-top:10px");            
            return;
        }
    });   

    function uniq(value, index, self) { 
        return self.indexOf(value) === index;
    }

    if (valid.length > 0) {
        valid = valid.filter(uniq);
    }   

    console.log(`%cWill check for ${valid.length} pages`, "font-size:16px;font-style:bold;");

    for (const u of valid) {
        const status = await getStatus(u);
        if (status === 200 || status === 304) {
            console.log(`%cOK (${status}): ${u}`, "font-size:12px;color:blue;border-top:1px solid red;padding-top:10px");
        } else {
            console.log(`%cBAD ${status}: ${u}`, "font-size:12px;color:red;border-top:1px solid red;padding-top:10px");
        }
    }
};

check404();

})();