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Prerequisites

Before you start, you’ll need: Make sure you have the latest version of the Vercel CLI installed.

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Guide

1

Install dependencies

Install the Resend Node.js SDK:
npm install resend
2

Set up environment variables

Add your Resend API key to your environment variables:
.env.local
RESEND_API_KEY=re_xxxxxxxxx
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 <onboarding@resend.dev>',
    to: ['delivered@resend.dev'],
    subject: 'hello world',
    html: '<strong>it works!</strong>',
  });

  return Response.json(response, {
    status: response.error ? 500 : 200,
  });
}
4

Send email locally

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

Vercel Functions Example

See the full source code.