Returns the action data from the most recent POST navigation form submission or undefined if there hasn't been one.
import { Form, useActionData } from "react-router"; export async function action({ request }) { const body = await request.formData(); const name = body.get("visitorsName"); return { message: `Hello, ${name}` }; } export default function Invoices() { const data = useActionData(); return ( <Form method="post"> <input type="text" name="visitorsName" /> {data ? data.message : "Waiting..."} </Form> ); } function useActionData<T = any>(): SerializeFrom<T> | undefined The data returned from the route's action function, or undefined if no action has been called