AWS SES Module

A developer-friendly Node.js module for sending emails using AWS Simple Email Service (SES). This module supports to, cc, bcc, HTML emails, and includes built-in rate limiting.

Features

• Send emails with to, cc, and bcc recipients.
• Supports HTML and plain text emails.
• Rate limiting with configurable limits to prevent excessive requests.
• Input validation for email addresses, subject, and body using zod.
• Easy integration with AWS SES using the latest SDK.
• Written in TypeScript for type safety and scalability.

Installation

Prerequisites

• Node.js: Ensure you have Node.js installed (version 14 or later recommended).
• AWS SES: Configure and verify your domain and email addresses in the AWS SES console.
• AWS Credentials: Set up an AWS access key with permissions to use SES.

Install the Module

npm install aws-ses-module

Install dotenv (Optional)

If you are using environment variables, make sure to install and configure dotenv:

npm install dotenv

Usage

1. Configure Environment Variables

Create a .env file in your project root and add the following:

AWS_ACCESS_KEY_ID=your-aws-access-key-id
AWS_SECRET_ACCESS_KEY=your-aws-secret-access-key
AWS_REGION=your-aws-region
[email protected]

2. Import and Use the Module

import 'dotenv/config'; // Ensure this is included to load .env variables
import { sendEmail } from 'aws-ses-module';

async function sendWelcomeEmail(userEmail: string, userName: string) {
  try {
    const result = await sendEmail({
      to: [userEmail],
      subject: 'Welcome to Our Platform!',
      body: `
        <h1>Welcome, ${userName}!</h1>
        <p>We're excited to have you on board.</p>
        <p>If you have any questions, feel free to reply to this email.</p>
      `,
      isHtml: true,
    });

    if (result.success) {
      console.log(`Email sent successfully to ${userEmail}`);
    } else {
      console.error(`Failed to send email:`, result.error);
    }
  } catch (error) {
    console.error('An error occurred:', error);
  }
}

// Call the function
sendWelcomeEmail('[email protected]', 'Shubham Vishwakarma');

API Reference

sendEmail(params: EmailParams): Promise<EmailResult>

Send an email using AWS SES.

Parameters

• params: An object with the following fields:
  • to (string[]): Required. Array of recipient email addresses.
  • cc (string[], optional): Array of CC email addresses.
  • bcc (string[], optional): Array of BCC email addresses.
  • subject (string): Required. Subject of the email.
  • body (string): Required. Content of the email.
  • isHtml (boolean, optional): Defaults to true. Set to false to send plain text.

Returns

A promise that resolves to an EmailResult object:

interface EmailResult {
  success: boolean;
  result?: any;
  error?: string;
}

Example

const emailParams = {
  to: ['[email protected]'],
  cc: ['[email protected]'],
  subject: 'Hello!',
  body: '<h1>Hello World</h1>',
  isHtml: true,
};

const result = await sendEmail(emailParams);
console.log(result);

Error Handling

If you encounter the error:

Resolved credential object is not valid, ensure you have:

1. Correctly loaded environment variables using dotenv.
2. Verified the AWS credentials in .env and the AWS console.

npm install dotenv

Add this line to the top of your file:

import 'dotenv/config';

Rate Limiting

This module uses the rate-limiter-flexible library to limit email-sending requests.

• Configuration: 100 requests per minute (default).
• Error: If the limit is exceeded, you will receive the following error:

  Rate limit exceeded. Please try again later.

You can modify the rate-limiting settings in the rateLimiter.ts file.

Environment Validation

Environment variables are validated using zod. If any required variable is missing or invalid, the application will terminate with an error like:

Environment variable validation failed: [
  {
    "message": "Expected string, received undefined",
    "path": ["AWS_ACCESS_KEY_ID"]
  }
]

License

This project is licensed under the MIT License. See the LICENSE file for details.

Troubleshooting

Common Issues

1. Email not sent:

   • Ensure the SENDER_EMAIL is verified in AWS SES.
   • Verify the to, cc, and bcc addresses are either verified or in the same domain (if in sandbox mode).

2. Environment variables not loaded:

   • Ensure dotenv is installed and correctly configured.

3. Rate limit errors:

   • Lower the email frequency or adjust the rate-limiting configuration.

Contributing

Contributions are welcome! To contribute:

1. Fork the repository.
2. Create a new branch.
3. Make your changes and submit a pull request.

Feedback and Support

If you find a bug or have a feature request, please open an issue on GitHub.

Author

Shubham Vishwakarma
GitHub