Getting your local instance's URL for an external status on Mastodon

local-status-link.js

const instance = "https://rheinneckar.social";

async function getLocalPost(url) {
    const encodedUrl = encodeURIComponent(url);
    const resp = await fetch(`${instance}/api/v2/search?q=${encodedUrl}&resolve=true&limit=1`, { credentials: "include" });
    const data = await resp.json();
    const status = data.statuses[0];
    const id = status.id;
    const acct = status.account.acct;
    return `${instance}/${acct}/${id}`;
}

console.log(await getLocalPost("https://fosstodon.org/@rauschma/109428469327665227"));

@niklaskorz Thank you, that was useful today, but in my case Line 10 had to be adapted (notice the @):

    return `${instance}/@${acct}/${id}`;