xedom

You need to escape your backslashes (\\ instead of \). Also CS:GO's appid is 730, not 740 (use the game appid, not the server appid).

Yes, i would say so. Notice that the max limit is 5000

Try to add setTimeout with a few sec and see if it helps, might be called too early

Sorry, my bad.. NULL must be null

client.getServerList(NULL, 100, (servers) => { console.log(servers); }) You can find information about filters here: https://developer.valvesoftware.com/wiki/Master_Server_Query_Protocol#Filter