Query Steam keys. Based on: https://gist.github.com/petersvp/270f7d5d7d548448f4897586a0d389c0

paste-in-console-query-keys.js

keys = `
PASTE-KEYSS-HEREE
PASTE-KEYSS-HEREE
PASTE-KEYSS-HEREE
`

var keylist = keys.split("\n");

for (let i=0; i<keylist.length; i+=200) {
    keylist.slice(i, i+200).forEach(key => {
        if(key.length<17) return;
        function reqListener () {
            let body = this.responseText;
            let result = body.split('<h2>Activation Details</h2>')[1];
            if (!result) {
                console.log('Error quering CD Key ' + key);
                return;
            }
            result = result.split('</table>')[0];
            result = result.match(/<td>.*<\/td>/g);
            result = result.map(function (line) {
                return line.replace(/<[^>]*>/g, '');
            });
            let line = [key, (result[0] === 'Activated') ? '"' + result[1] + '"' : result[0]].join('\t');
            console.log(line);
        }
        var oReq = new XMLHttpRequest();
        oReq.addEventListener("load", reqListener);
        oReq.open("GET", "https://partner.steamgames.com/querycdkey/cdkey?cdkey="+key+"&method=Query");
        oReq.send();
    });
    await new Promise(r => setTimeout(r, 10000));
}