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Prerequisites

To get the most out of this guide, you’ll need to: Make sure you have the latest version of the Vercel CLI installed.

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1. Install dependencies

Install the Resend SDK: 
npm install resend

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2. Set up environment variables

Add your Resend API key to your environment variables:
.env.local
RESEND_API_KEY=re_xxxxxxxxx

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3. Create a Next.js function

Create a route file under app/api/send/route.ts if you’re using the App Router.
route.ts
import { Resend } from 'resend';

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

export async function POST() {
  const response = await resend.emails.send({
    from: 'Acme <[email protected]>',
    to: ['[email protected]'],
    subject: 'hello world',
    html: '<strong>it works!</strong>',
  });

  return Response.json(response, {
    status: response.error ? 500 : 200,
  });
}

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4. Send email locally

Run function locally: 
npm run dev
Open the endpoint URL to send an email: http://localhost:3000/api/send

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5. Send email in production

Deploy function to Vercel: 
vercel
Make sure to add your RESEND_API_KEY environment variable in your Vercel project settings. Open the endpoint URL to send an email: https://your-project.vercel.app/api/send

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6. Try it yourself

Vercel Functions Example

See the full source code.