Sending Emails - Supabase

Sending emails from Edge Functions using the Resend API.

Prerequisites

To get the most out of this guide, you’ll need to:

Make sure you have the latest version of the Supabase CLI installed.

1. Create Supabase function

Create a new function locally:

bash

supabase functions new resend

Store the RESEND_API_KEY in your .env file.

2. Edit the handler function

Paste the following code into the index.ts file:

tsx

import { withSupabase } from 'npm:@supabase/server@^1'

const RESEND_API_KEY = Deno.env.get('RESEND_API_KEY')

const handler = async (_request: Request): Promise<Response> => {
  const res = await fetch('https://api.resend.com/emails', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      Authorization: `Bearer ${RESEND_API_KEY}`,
    },
    body: JSON.stringify({
      from: '[email protected]',
      to: '[email protected]',
      subject: 'hello world',
      html: '<strong>it works!</strong>',
    }),
  })

  const data = await res.json()

  return Response.json(data)
}

export default { fetch: withSupabase({ auth: ['user', 'secret'] }, handler) }

3. Deploy and send email

Run function locally:

bash

supabase start
supabase functions serve --no-verify-jwt --env-file .env

The function accepts a signed-in user's JWT or a secret key, so it can be triggered from your app (via supabase.functions.invoke) or from a database function. Test it locally with a secret key:

bash

curl -i --request POST 'http://localhost:54321/functions/v1/resend' \
  --header 'apikey: <SUPABASE_SECRET_KEY>'

Deploy function to Supabase:

bash

supabase functions deploy resend --no-verify-jwt

When you deploy to Supabase, make sure that your RESEND_API_KEY is set in Edge Function Secrets Management

</Admonition>

4. Try it yourself

Find the complete example on GitHub.