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How to set metadata to page.tsx rendered as client components?

The export const metadata syntax seems to not work if page.tsx is a client component. How do I set my page title and other metadata then?

The metadata, generateMetadata, viewport and generateViewport exports are only supported in server components. Hence, you need to make your page a server component to use them. A method to do that is to move all your client-side logic to a separate client component and import that client component to the now-server component page.tsx. So instead of

page.tsx
"use client";
export default function Page() {
  useSomeHook();
  return <Something />;
}
export const metadata = { title: "My Page" };

you need to make a new client component, say page.client.tsx, and import it to page.tsx:

page.client.tsx
"use client";
 
export default function PageClient() {
  useSomeHook();
  return <Something />;
}
page.tsx
import PageClient from "./page.client"; 
 
export const metadata = { title: "My Page" };
 
export default function Page() {
  return <PageClient />;
}

How do I set dynamic metadata that depends on client-side states?

Just put <title>, <meta> and metadata <link> tags anywhere in your component tree, including inside client components. React will automatically detect this and put those tags in <head> for you.

"use client";
import { useState } from "react";
 
export default function Page() {
  const [title, setTitle] = useState("Hello World");
  return (
    <div>
      {/* Yes, we simply put the <title> tag anywhere in the document. */}
      <title>{title}</title>
      <input value={title} onChange={e => setTitle(e.target.value)} />
    </div>
  );
}
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