@custom-auth/adapter-resend

📦 Ecosystem Packages

• 🔑 Core Engine (@custom-auth/core) — The core framework-agnostic auth engine.
• ⚛️ React SDK (@custom-auth/react) — React hooks and context provider.
• 🌐 Next.js SDK (@custom-auth/nextjs) — Edge-compatible Next.js helpers and middleware.
• 🗄️ Database Adapters:
  • Prisma (@custom-auth/prisma)
  • Drizzle (@custom-auth/drizzle)
  • Mongoose (@custom-auth/mongoose)
• ✉️ Email Adapters:
  • Nodemailer (@custom-auth/adapter-nodemailer)
  • Resend (@custom-auth/adapter-resend)

Edge-compatible email adapter for @custom-auth/core using the Resend API. Uses only fetch() — no Node.js dependencies.

Installation

# Install the core engine, the Resend adapter, and your chosen database adapter
npm install @custom-auth/core @custom-auth/adapter-resend <your-db-adapter>

Get an API key at resend.com and verify your sending domain.

Usage

import { createAuth } from '@custom-auth/core';
import { ResendEmailAdapter } from '@custom-auth/adapter-resend';

const auth = createAuth({
  secret: process.env.AUTH_SECRET!,
  emailAdapter: new ResendEmailAdapter({
    apiKey: process.env.RESEND_API_KEY!,
    from: 'Auth <[email protected]>',
  }),
  emailVerification: true,
  verifyEmailUrl: 'https://yourapp.com/verify-email',
  resetPasswordUrl: 'https://yourapp.com/reset-password',
});

Custom templates

new ResendEmailAdapter({
  apiKey: process.env.RESEND_API_KEY!,
  from: 'Auth <[email protected]>',
  templates: {
    magicLink: (email, url) => ({
      subject: 'Your magic sign-in link',
      html: `<a href="${url}">Click to sign in</a>`,
      text: `Sign in: ${url}`,
    }),
    // verification and passwordReset use defaults
  },
});

Sent emails

| Trigger | Template key | |---------|-------------| | emailVerification: true on register | verification | | POST /forgot-password | passwordReset | | POST /magic-link | magicLink |

Documentation

For full documentation, please visit the Main Repository.