Sponsored by Cloudflare

Cloudflare proudly supports JS13K Online.

Focus on the Game

You don't need to write any server code to participate in the Online category. The JS13K Online relay server is hosted on Cloudflare and will handle all the server-side logic for you.

Vanilla JS

You can add MMO to your game using just vanilla JS. No React, no Angular, no Vue, no Svelte, no Deno, no Node, no Bun, no anything.