App Bridge v2 required host parameter is missing from the OAuth confirmation redirect's query string

Option #2

Only if you absolutely must. But if you’re going with nodejs and koa-shopify-auth, it’s all handled for you and proper encoded host will be made available upon completion of the client auth process.

const params = new URLSearchParams(window.location.search);
const query = {
      host: params.get("host"),
      shop: params.get("shop")
};

// base64 encode "shop/admin" if query.host is absent
let host = query.host || btoa(`${query.shop}/admin`);

const provider = ;