const form = document.querySelector("#auth-form"); const message = document.querySelector("#message"); async function submit(url) { const response = await fetch(url, { method: "POST", headers: { "content-type": "application/json" }, body: JSON.stringify(Object.fromEntries(new FormData(form))), }); const body = await response.json(); if (!response.ok) { message.textContent = body.error || body.code; return; } location.assign("/app"); } form.addEventListener("submit", (event) => { event.preventDefault(); submit("/api/auth/login"); }); document.querySelector("#signup").addEventListener("click", () => submit("/api/auth/signup"), );