The AWS SDK for JavaScript V3 API Reference Guide describes in detail all the API operations for the AWS SDK for JavaScript version 3 (V3).

Sending SMS Messages with Amazon SNS

This Node.js code example shows:

The Scenario

You can use Amazon SNS to send text messages, or SMS messages, to SMS-enabled devices. You can send a message directly to a phone number, or you can send a message to multiple phone numbers at once by subscribing those phone numbers to a topic and sending your message to the topic.

In this example, you use a series of Node.js modules to publish SMS text messages from Amazon SNS to SMS-enabled devices. The Node.js modules use the SDK for JavaScript to publish SMS messages using these methods of the SNS client class:

Prerequisite Tasks

To set up and run this example, you must first complete these tasks:

Getting SMS Attributes

Use Amazon SNS to specify preferences for SMS messaging, such as how your deliveries are optimized (for cost or for reliable delivery), your monthly spending limit, how message deliveries are logged, and whether to subscribe to daily SMS usage reports. These preferences are retrieved and set as SMS attributes for Amazon SNS.

In this example, use a Node.js module to get the current SMS attributes in Amazon SNS.

Create a libs directory, and create a Node.js module with the file name snsClient.js. Copy and paste the code below into it, which creates the Amazon SNS client object. Replace REGION with your AWS Region.

import { SNSClient } from "@aws-sdk/client-sns";

// The AWS Region can be provided here using the `region` property. If you leave it blank
// the SDK will default to the region set in your AWS config.
export const snsClient = new SNSClient({});

This example code can be found here on GitHub.

Create a Node.js module with the file name get-sms-attributes.js.

Configure the SDK as previously shown, including downloading the required clients and packages. Create an object containing the parameters for getting SMS attributes, including the names of the individual attributes to get. For details on available SMS attributes, see SetSMSAttributes in the Amazon Simple Notification Service API Reference.

This example gets the DefaultSMSType attribute, which controls whether SMS messages are sent as Promotional, which optimizes message delivery to incur the lowest cost, or as Transactional, which optimizes message delivery to achieve the highest reliability. Pass the parameters to the SetTopicAttributesCommand method of the SNS client class. To call the SetSMSAttributesCommand method, create an asynchronous function invoking an Amazon SNS client service object, passing the parameters object.

import { GetSMSAttributesCommand } from "@aws-sdk/client-sns";
import { snsClient } from "../libs/snsClient.js";

export const getSmsAttributes = async () => {
  const response = await snsClient.send(
    // If you have not modified the account-level mobile settings of SNS,
    // the DefaultSMSType is undefined. For this example, it was set to
    // Transactional.
    new GetSMSAttributesCommand({ attributes: ["DefaultSMSType"] }),
  );

  console.log(response);
  // {
  //   '$metadata': {
  //     httpStatusCode: 200,
  //     requestId: '67ad8386-4169-58f1-bdb9-debd281d48d5',
  //     extendedRequestId: undefined,
  //     cfId: undefined,
  //     attempts: 1,
  //     totalRetryDelay: 0
  //   },
  //   attributes: { DefaultSMSType: 'Transactional' }
  // }
  return response;
};

To run the example, enter the following at the command prompt.

node get-sms-attributes.js

This example code can be found here on GitHub.

Setting SMS Attributes

In this example, use a Node.js module to get the current SMS attributes in Amazon SNS.

Create a libs directory, and create a Node.js module with the file name snsClient.js. Copy and paste the code below into it, which creates the Amazon SNS client object. Replace REGION with your AWS Region.

import { SNSClient } from "@aws-sdk/client-sns";

// The AWS Region can be provided here using the `region` property. If you leave it blank
// the SDK will default to the region set in your AWS config.
export const snsClient = new SNSClient({});

This example code can be found here on GitHub.

Create a Node.js module with the file name set-sms-attribute-type.js. Configure the SDK as previously shown, including installing the required clients and packages. Create an object containing the parameters for setting SMS attributes, including the names of the individual attributes to set and the values to set for each. For details on available SMS attributes, see SetSMSAttributes in the Amazon Simple Notification Service API Reference.

This example sets the DefaultSMSType attribute to Transactional, which optimizes message delivery to achieve the highest reliability. Pass the parameters to the SetTopicAttributesCommand method of the SNS client class. To call the SetSMSAttributesCommand method, create an asynchronous function invoking an Amazon SNS client service object, passing the parameters object.

import { SetSMSAttributesCommand } from "@aws-sdk/client-sns";
import { snsClient } from "../libs/snsClient.js";

/**
 * @param {"Transactional" | "Promotional"} defaultSmsType
 */
export const setSmsType = async (defaultSmsType = "Transactional") => {
  const response = await snsClient.send(
    new SetSMSAttributesCommand({
      attributes: {
        // Promotional – (Default) Noncritical messages, such as marketing messages.
        // Transactional – Critical messages that support customer transactions,
        // such as one-time passcodes for multi-factor authentication.
        DefaultSMSType: defaultSmsType,
      },
    }),
  );
  console.log(response);
  // {
  //   '$metadata': {
  //     httpStatusCode: 200,
  //     requestId: '1885b977-2d7e-535e-8214-e44be727e265',
  //     extendedRequestId: undefined,
  //     cfId: undefined,
  //     attempts: 1,
  //     totalRetryDelay: 0
  //   }
  // }
  return response;
};

To run the example, enter the following at the command prompt.

node set-sms-attribute-type.js 

This example code can be found here on GitHub.

Checking If a Phone Number Has Opted Out

In this example, use a Node.js module to check a phone number to see if it has opted out from receiving SMS messages.

Create a libs directory, and create a Node.js module with the file name snsClient.js. Copy and paste the code below into it, which creates the Amazon SNS client object. Replace REGION with your AWS Region.

import { SNSClient } from "@aws-sdk/client-sns";

// The AWS Region can be provided here using the `region` property. If you leave it blank
// the SDK will default to the region set in your AWS config.
export const snsClient = new SNSClient({});

This example code can be found here on GitHub.

Create a Node.js module with the file name check-if-phone-number-is-opted-out.js. Configure the SDK as previously shown. Create an object containing the phone number to check as a parameter.

This example sets the PhoneNumber parameter to specify the phone number to check. Pass the object to the CheckIfPhoneNumberIsOptedOutCommand method of the SNS client class. To call the CheckIfPhoneNumberIsOptedOutCommand method, create an asynchronous function invoking an Amazon SNS client service object, passing the parameters object.

import { CheckIfPhoneNumberIsOptedOutCommand } from "@aws-sdk/client-sns";

import { snsClient } from "../libs/snsClient.js";

export const checkIfPhoneNumberIsOptedOut = async (
  phoneNumber = "5555555555",
) => {
  const command = new CheckIfPhoneNumberIsOptedOutCommand({
    phoneNumber,
  });

  const response = await snsClient.send(command);
  console.log(response);
  // {
  //   '$metadata': {
  //     httpStatusCode: 200,
  //     requestId: '3341c28a-cdc8-5b39-a3ee-9fb0ee125732',
  //     extendedRequestId: undefined,
  //     cfId: undefined,
  //     attempts: 1,
  //     totalRetryDelay: 0
  //   },
  //   isOptedOut: false
  // }
  return response;
};

To run the example, enter the following at the command prompt.

node check-if-phone-number-is-opted-out.js 

This example code can be found here on GitHub.

Listing Opted-Out Phone Numbers

In this example, use a Node.js module to get a list of phone numbers that have opted out from receiving SMS messages.

Create a libs directory, and create a Node.js module with the file name snsClient.js. Copy and paste the code below into it, which creates the Amazon SNS client object. Replace REGION with your AWS Region.

import { SNSClient } from "@aws-sdk/client-sns";

// The AWS Region can be provided here using the `region` property. If you leave it blank
// the SDK will default to the region set in your AWS config.
export const snsClient = new SNSClient({});

This example code can be found here on GitHub.

Create a Node.js module with the file name list-phone-numbers-opted-out.js. Configure the SDK as previously shown. Create an empty object as a parameter.

Pass the object to the ListPhoneNumbersOptedOutCommand method of the SNS client class. To call the ListPhoneNumbersOptedOutCommand method, create an asynchronous function invoking an Amazon SNS client service object, passing the parameters object.

import { ListPhoneNumbersOptedOutCommand } from "@aws-sdk/client-sns";
import { snsClient } from "../libs/snsClient.js";

export const listPhoneNumbersOptedOut = async () => {
  const response = await snsClient.send(
    new ListPhoneNumbersOptedOutCommand({}),
  );
  console.log(response);
  // {
  //   '$metadata': {
  //     httpStatusCode: 200,
  //     requestId: '44ff72fd-1037-5042-ad96-2fc16601df42',
  //     extendedRequestId: undefined,
  //     cfId: undefined,
  //     attempts: 1,
  //     totalRetryDelay: 0
  //   },
  //   phoneNumbers: ['+15555550100']
  // }
  return response;
};

To run the example, enter the following at the command prompt.

node list-phone-numbers-opted-out.js 

This example code can be found here on GitHub.

Publishing an SMS Message

In this example, use a Node.js module to send an SMS message to a phone number.

Create a libs directory, and create a Node.js module with the file name snsClient.js. Copy and paste the code below into it, which creates the Amazon SNS client object. Replace REGION with your AWS Region.

import { SNSClient } from "@aws-sdk/client-sns";

// The AWS Region can be provided here using the `region` property. If you leave it blank
// the SDK will default to the region set in your AWS config.
export const snsClient = new SNSClient({});

This example code can be found here on GitHub.

Create a Node.js module with the file name publish-sms.js. Configure the SDK as previously shown, including installing the required clients and packages. Create an object containing the Message and PhoneNumber parameters.

When you send an SMS message, specify the phone number using the E.164 format. E.164 is a standard for the phone number structure used for international telecommunication. Phone numbers that follow this format can have a maximum of 15 digits, and they are prefixed with the plus character (+) and the country code. For example, a US phone number in E.164 format would appear as +1001XXX5550100.

This example sets the PhoneNumber parameter to specify the phone number to send the message. Pass the object to the PublishCommand method of the SNS client class. To call the PublishCommand method, create an asynchronous function invoking an Amazon SNS service object, passing the parameters object.

import { PublishCommand } from "@aws-sdk/client-sns";
import { snsClient } from "../libs/snsClient.js";

/**
 * @param {string | Record<string, any>} message - The message to send. Can be a plain string or an object
 *                                                 if you are using the `json` `MessageStructure`.
 * @param {*} phoneNumber - The phone number to send the message to.
 */
export const publish = async (
  message = "Hello from SNS!",
  phoneNumber = "+15555555555",
) => {
  const response = await snsClient.send(
    new PublishCommand({
      Message: message,
      // One of PhoneNumber, TopicArn, or TargetArn must be specified.
      PhoneNumber: phoneNumber,
    }),
  );
  console.log(response);
  // {
  //   '$metadata': {
  //     httpStatusCode: 200,
  //     requestId: '7410094f-efc7-5f52-af03-54737569ab77',
  //     extendedRequestId: undefined,
  //     cfId: undefined,
  //     attempts: 1,
  //     totalRetryDelay: 0
  //   },
  //   MessageId: 'xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx'
  // }
  return response;
};

To run the example, enter the following at the command prompt.

node publish-sms.js

This example code can be found here on GitHub.