The qstash-js SDK offers an integration to easily send emails using Resend, streamlining email delivery in your applications.

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Basic Email Sending

To send a single email, use the publishJSON method with the resend provider. Ensure your QSTASH_TOKEN and RESEND_TOKEN are set for authentication. 
import { Client, resend } from "@upstash/qstash";
const client = new Client({ token: "<QSTASH_TOKEN>" });

await client.publishJSON({
  api: {
    name: "email",
    provider: resend({ token: "<RESEND_TOKEN>" }),
  },
  body: {
    from: "Acme <onboarding@resend.dev>",
    to: ["delivered@resend.dev"],
    subject: "Hello World",
    html: "<p>It works!</p>",
  },
});
In the body field, specify any parameters supported by the Resend Send Email API, such as from, to, subject, and html.

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Sending Batch Emails

To send multiple emails at once, use Resend’s Batch Email API. Set the batch option to true to enable batch sending. Each email configuration is defined as an object within the body array. 
await client.publishJSON({
  api: {
    name: "email",
    provider: resend({ token: "<RESEND_TOKEN>", batch: true }),
  },
  body: [
    {
      from: "Acme <onboarding@resend.dev>",
      to: ["foo@gmail.com"],
      subject: "Hello World",
      html: "<h1>It works!</h1>",
    },
    {
      from: "Acme <onboarding@resend.dev>",
      to: ["bar@outlook.com"],
      subject: "World Hello",
      html: "<p>It works!</p>",
    },
  ],
});
Each entry in the body array represents an individual email, allowing customization of from, to, subject, html, and any other Resend-supported fields.