Resend installation

Install the package

Use Bun first when possible:

bun add @workermailer/resend

If your project uses npm:

npm install @workermailer/resend

Add your API key as a secret

wrangler secret put RESEND_API_KEY

If you want a default sender address available across sends, store that too.

wrangler secret put RESEND_FROM

Minimal Worker config

This package uses fetch, so you do not need the socket-specific setup required by the SMTP package. A normal Worker deployment is enough as long as outbound HTTPS is available.

Recommended environment shape

interface Env {
  RESEND_API_KEY: string;
  RESEND_FROM?: string;
}

Local development

Because the package uses fetch, local development is simpler than SMTP. You can still choose to stub delivery in dev mode if you do not want to hit the real API.

if (import.meta.env?.DEV) {
  console.log('Skipping real Resend send in local development');
  return;
}