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).

Managing Topics in Amazon SNS

This Node.js code example shows:

The Scenario

In this example, you use a series of Node.js modules to create, list, and delete Amazon SNS topics, and to handle topic attributes. The Node.js modules use the SDK for JavaScript to manage topics using these methods of the SNS client class:

Prerequisite Tasks

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

Creating a Topic

In this example, use a Node.js module to create an Amazon SNS topic.

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 create-topic.js. Configure the SDK as previously shown, including installing the required clients and packages.

Create an object to pass the Name for the new topic to the CreateTopicCommand method of the SNS client class. To call the CreateTopicCommand method, create an asynchronous function invoking an Amazon SNS service object, passing the parameters object. The data returned contains the ARN of the topic.

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

/**
 * @param {string} topicName - The name of the topic to create.
 */
export const createTopic = async (topicName = "TOPIC_NAME") => {
  const response = await snsClient.send(
    new CreateTopicCommand({ Name: topicName }),
  );
  console.log(response);
  // {
  //   '$metadata': {
  //     httpStatusCode: 200,
  //     requestId: '087b8ad2-4593-50c4-a496-d7e90b82cf3e',
  //     extendedRequestId: undefined,
  //     cfId: undefined,
  //     attempts: 1,
  //     totalRetryDelay: 0
  //   },
  //   TopicArn: 'arn:aws:sns:us-east-1:xxxxxxxxxxxx:TOPIC_NAME'
  // }
  return response;
};

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

node create-topic.js

This example code can be found here on GitHub.

Listing Your Topics

In this example, use a Node.js module to list all Amazon SNS topics.

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-topics.js. Configure the SDK as previously shown, including installing the required clients and packages.

Create an empty object to pass to the ListTopicsCommand method of the SNS client class. To call the ListTopicsCommand method, create an asynchronous function invoking an Amazon SNS service object, passing the parameters object. The data returned contains an array of your topic Amazon Resource Names (ARNs).

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

export const listTopics = async () => {
  const response = await snsClient.send(new ListTopicsCommand({}));
  console.log(response);
  // {
  //   '$metadata': {
  //     httpStatusCode: 200,
  //     requestId: '936bc5ad-83ca-53c2-b0b7-9891167b909e',
  //     extendedRequestId: undefined,
  //     cfId: undefined,
  //     attempts: 1,
  //     totalRetryDelay: 0
  //   },
  //   Topics: [ { TopicArn: 'arn:aws:sns:us-east-1:xxxxxxxxxxxx:mytopic' } ]
  // }
  return response;
};

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

node list-topics.js

This sample code can be found here on GitHub.

Deleting a Topic

In this example, use a Node.js module to delete an Amazon SNS topic.

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 delete-topic.js. Configure the SDK as previously shown, including installing the required clients and packages.

Create an object containing the TopicArn of the topic to delete to pass to the DeleteTopicCommand method of the SNS client class. To call the DeleteTopicCommand method, create an asynchronous function invoking an Amazon SNS client service object, passing the parameters object.

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

/**
 * @param {string} topicArn - The ARN of the topic to delete.
 */
export const deleteTopic = async (topicArn = "TOPIC_ARN") => {
  const response = await snsClient.send(
    new DeleteTopicCommand({ TopicArn: topicArn }),
  );
  console.log(response);
  // {
  //   '$metadata': {
  //     httpStatusCode: 200,
  //     requestId: 'a10e2886-5a8f-5114-af36-75bd39498332',
  //     extendedRequestId: undefined,
  //     cfId: undefined,
  //     attempts: 1,
  //     totalRetryDelay: 0
  //   }
  // }
};

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

node delete-topic.js

This example code can be found here on GitHub.

Getting Topic Attributes

In this example, use a Node.js module to retrieve attributes of an Amazon SNS topic.

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-topic-attributes.js. Configure the SDK as previously shown.

Create an object containing the TopicArn of a topic to delete to pass to the GetTopicAttributesCommand method of the SNS client class. To call the GetTopicAttributesCommand method, invoking an Amazon SNS client service object, passing the parameters object.

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

/**
 * @param {string} topicArn - The ARN of the topic to retrieve attributes for.
 */
export const getTopicAttributes = async (topicArn = "TOPIC_ARN") => {
  const response = await snsClient.send(
    new GetTopicAttributesCommand({
      TopicArn: topicArn,
    }),
  );
  console.log(response);
  // {
  //   '$metadata': {
  //     httpStatusCode: 200,
  //     requestId: '36b6a24e-5473-5d4e-ac32-ff72d9a73d94',
  //     extendedRequestId: undefined,
  //     cfId: undefined,
  //     attempts: 1,
  //     totalRetryDelay: 0
  //   },
  //   Attributes: {
  //     Policy: '{...}',
  //     Owner: 'xxxxxxxxxxxx',
  //     SubscriptionsPending: '1',
  //     TopicArn: 'arn:aws:sns:us-east-1:xxxxxxxxxxxx:mytopic',
  //     TracingConfig: 'PassThrough',
  //     EffectiveDeliveryPolicy: '{"http":{"defaultHealthyRetryPolicy":{"minDelayTarget":20,"maxDelayTarget":20,"numRetries":3,"numMaxDelayRetries":0,"numNoDelayRetries":0,"numMinDelayRetries":0,"backoffFunction":"linear"},"disableSubscriptionOverrides":false,"defaultRequestPolicy":{"headerContentType":"text/plain; charset=UTF-8"}}}',
  //     SubscriptionsConfirmed: '0',
  //     DisplayName: '',
  //     SubscriptionsDeleted: '1'
  //   }
  // }
  return response;
};

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

node get-topic-attributes.js

This example code can be found here on GitHub.

Setting Topic Attributes

In this example, use a Node.js module to set the mutable attributes of an Amazon SNS topic.

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-topic-attributes.js. Configure the SDK as previously shown.

Create an object containing the parameters for the attribute update, including the TopicArn of the topic whose attributes you want to set, the name of the attribute to set, and the new value for that attribute. You can set only the Policy, DisplayName, and DeliveryPolicy attributes. Pass the parameters to the SetTopicAttributesCommand method of the SNS client class. To call the SetTopicAttributesCommand method, create an asynchronous function invoking an Amazon SNS client service object, passing the parameters object.

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

export const setTopicAttributes = async (
  topicArn = "TOPIC_ARN",
  attributeName = "DisplayName",
  attributeValue = "Test Topic",
) => {
  const response = await snsClient.send(
    new SetTopicAttributesCommand({
      AttributeName: attributeName,
      AttributeValue: attributeValue,
      TopicArn: topicArn,
    }),
  );
  console.log(response);
  // {
  //   '$metadata': {
  //     httpStatusCode: 200,
  //     requestId: 'd1b08d0e-e9a4-54c3-b8b1-d03238d2b935',
  //     extendedRequestId: undefined,
  //     cfId: undefined,
  //     attempts: 1,
  //     totalRetryDelay: 0
  //   }
  // }
  return response;
};

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

node set-topic-attributes.js

This example code can be found here on GitHub.