Resend react prop: pass the component and the Node SDK renders it, and it is Node-only

react prop: the SDK renders, you just pass the component

import { Resend } from 'resend';
import { WelcomeEmail } from './emails/welcome';

const resend = new Resend(process.env.RESEND_API_KEY);

const { data, error } = await resend.emails.send({
  from: '[SENDER]',
  to: ['[RECIPIENT]'],
  subject: 'Welcome',
  react: WelcomeEmail({ name: '[NAME]' }),
});

if (error) {
  console.error(error);
}

Checklist

• react takes the component. You do not need to render it to an HTML string yourself; the Node SDK does the HTML and plain-text rendering for you.

• The param is documented as only available in the Node.js SDK. Python, PHP, Ruby, and Go SDKs do not accept it; there you render to html yourself.

• Pick one body form per send: react or html. Passing the component means you do not also need an html string for the same email.

• The component must be a React Email component. Arbitrary JSX with browser-only APIs will not survive email rendering; keep it to email-safe markup.

The API reference describes react as the React component used to write the message, only available in the Node.js SDK. Verified live at https://resend.com/docs/api-reference/emails/send-email. The Next.js guide shows the react prop in use at https://resend.com/docs/send-with-nextjs.