@aws-sdk/client-polly

What is @aws-sdk/client-polly?

@aws-sdk/client-polly is an AWS SDK for JavaScript package that allows developers to interact with Amazon Polly, a service that turns text into lifelike speech. This package provides a variety of functionalities to synthesize speech, manage lexicons, and retrieve information about available voices and speech synthesis tasks.

What are @aws-sdk/client-polly's main functionalities?

Synthesize Speech

This feature allows you to convert text into speech. The code sample demonstrates how to synthesize speech using the PollyClient and SynthesizeSpeechCommand classes.

const { PollyClient, SynthesizeSpeechCommand } = require('@aws-sdk/client-polly');
const client = new PollyClient({ region: 'us-west-2' });
const params = {
  OutputFormat: 'mp3',
  Text: 'Hello, world!',
  VoiceId: 'Joanna'
};
const command = new SynthesizeSpeechCommand(params);
client.send(command).then((data) => {
  // Handle the audio stream in data.AudioStream
}).catch((error) => {
  console.error(error);
});

List Voices

This feature allows you to retrieve a list of available voices. The code sample demonstrates how to list voices using the PollyClient and DescribeVoicesCommand classes.

const { PollyClient, DescribeVoicesCommand } = require('@aws-sdk/client-polly');
const client = new PollyClient({ region: 'us-west-2' });
const command = new DescribeVoicesCommand({});
client.send(command).then((data) => {
  console.log(data.Voices);
}).catch((error) => {
  console.error(error);
});

Manage Lexicons

This feature allows you to manage custom pronunciation lexicons. The code sample demonstrates how to list lexicons using the PollyClient and ListLexiconsCommand classes.

const { PollyClient, ListLexiconsCommand } = require('@aws-sdk/client-polly');
const client = new PollyClient({ region: 'us-west-2' });
const command = new ListLexiconsCommand({});
client.send(command).then((data) => {
  console.log(data.Lexicons);
}).catch((error) => {
  console.error(error);
});

Other packages similar to @aws-sdk/client-polly

google-cloud-text-to-speech

The google-cloud-text-to-speech package is a client library for Google's Text-to-Speech API. It provides similar functionalities to @aws-sdk/client-polly, such as converting text to speech and managing voices. However, it is specific to Google's cloud services and offers different voice options and languages.

microsoft-cognitiveservices-speech-sdk

The microsoft-cognitiveservices-speech-sdk package is a client library for Microsoft's Azure Cognitive Services Speech API. It offers text-to-speech conversion, speech recognition, and translation features. Compared to @aws-sdk/client-polly, it provides a broader range of speech-related functionalities and integrates with Microsoft's Azure ecosystem.

ibm-watson

The ibm-watson package is a client library for IBM's Watson Text to Speech service. It allows developers to convert text to speech, manage custom voices, and handle pronunciation lexicons. While it offers similar text-to-speech capabilities as @aws-sdk/client-polly, it is tailored for IBM's Watson services and provides unique voice customization options.

README

@aws-sdk/client-polly

Description

AWS SDK for JavaScript Polly Client for Node.js, Browser and React Native.

Amazon Polly is a web service that makes it easy to synthesize speech from text.

The Amazon Polly service provides API operations for synthesizing high-quality speech from plain text and Speech Synthesis Markup Language (SSML), along with managing pronunciations lexicons that enable you to get the best results for your application domain.

Installing

To install the this package, simply type add or install @aws-sdk/client-polly using your favorite package manager:

• npm install @aws-sdk/client-polly
• yarn add @aws-sdk/client-polly
• pnpm add @aws-sdk/client-polly

Getting Started

Import

The AWS SDK is modulized by clients and commands. To send a request, you only need to import the PollyClient and the commands you need, for example ListLexiconsCommand:

// ES5 example
const { PollyClient, ListLexiconsCommand } = require("@aws-sdk/client-polly");

// ES6+ example
import { PollyClient, ListLexiconsCommand } from "@aws-sdk/client-polly";

Usage

To send a request, you:

• Initiate client with configuration (e.g. credentials, region).
• Initiate command with input parameters.
• Call send operation on client with command object as input.
• If you are using a custom http handler, you may call destroy() to close open connections.

// a client can be shared by different commands.
const client = new PollyClient({ region: "REGION" });

const params = {
  /** input parameters */
};
const command = new ListLexiconsCommand(params);

Async/await

We recommend using await operator to wait for the promise returned by send operation as follows:

// async/await.
try {
  const data = await client.send(command);
  // process data.
} catch (error) {
  // error handling.
} finally {
  // finally.
}

Async-await is clean, concise, intuitive, easy to debug and has better error handling as compared to using Promise chains or callbacks.

Promises

You can also use Promise chaining to execute send operation.

client.send(command).then(
  (data) => {
    // process data.
  },
  (error) => {
    // error handling.
  }
);

Promises can also be called using .catch() and .finally() as follows:

client
  .send(command)
  .then((data) => {
    // process data.
  })
  .catch((error) => {
    // error handling.
  })
  .finally(() => {
    // finally.
  });

Callbacks

We do not recommend using callbacks because of callback hell, but they are supported by the send operation.

// callbacks.
client.send(command, (err, data) => {
  // process err and data.
});

v2 compatible style

The client can also send requests using v2 compatible style. However, it results in a bigger bundle size and may be dropped in next major version. More details in the blog post on modular packages in AWS SDK for JavaScript

import * as AWS from "@aws-sdk/client-polly";
const client = new AWS.Polly({ region: "REGION" });

// async/await.
try {
  const data = await client.listLexicons(params);
  // process data.
} catch (error) {
  // error handling.
}

// Promises.
client
  .listLexicons(params)
  .then((data) => {
    // process data.
  })
  .catch((error) => {
    // error handling.
  });

// callbacks.
client.listLexicons(params, (err, data) => {
  // process err and data.
});

Troubleshooting

When the service returns an exception, the error will include the exception information, as well as response metadata (e.g. request id).

try {
  const data = await client.send(command);
  // process data.
} catch (error) {
  const { requestId, cfId, extendedRequestId } = error.$metadata;
  console.log({ requestId, cfId, extendedRequestId });
  /**
   * The keys within exceptions are also parsed.
   * You can access them by specifying exception names:
   * if (error.name === 'SomeServiceException') {
   *     const value = error.specialKeyInException;
   * }
   */
}

Getting Help

Please use these community resources for getting help. We use the GitHub issues for tracking bugs and feature requests, but have limited bandwidth to address them.

• Visit Developer Guide or API Reference.
• Check out the blog posts tagged with aws-sdk-js on AWS Developer Blog.
• Ask a question on StackOverflow and tag it with aws-sdk-js.
• Join the AWS JavaScript community on gitter.
• If it turns out that you may have found a bug, please open an issue.

To test your universal JavaScript code in Node.js, browser and react-native environments, visit our code samples repo.

Contributing

This client code is generated automatically. Any modifications will be overwritten the next time the @aws-sdk/client-polly package is updated. To contribute to client you can check our generate clients scripts.

License

This SDK is distributed under the Apache License, Version 2.0, see LICENSE for more information.

Client Commands (Operations List)

DeleteLexicon

Command API Reference / Input / Output

DescribeVoices

Command API Reference / Input / Output

GetLexicon

Command API Reference / Input / Output

GetSpeechSynthesisTask

Command API Reference / Input / Output

ListLexicons

Command API Reference / Input / Output

ListSpeechSynthesisTasks

Command API Reference / Input / Output

PutLexicon

Command API Reference / Input / Output

StartSpeechSynthesisTask

Command API Reference / Input / Output

SynthesizeSpeech

Command API Reference / Input / Output

Changelog

3.622.0 (2024-08-01)

Features

• client-bedrock: API and Documentation for Bedrock Model Copy feature. This feature lets you share and copy a custom model from one region to another or one account to another. (b85315c)
• client-controlcatalog: AWS Control Tower provides two new public APIs controlcatalog:ListControls and controlcatalog:GetControl under controlcatalog service namespace, which enable customers to programmatically retrieve control metadata of available controls. (c897818)
• client-iam: Add v2 smoke tests and smithy smokeTests trait for SDK testing. (b754d41)
• client-rds: This release adds support for specifying optional MinACU parameter in CreateDBShardGroup and ModifyDBShardGroup API. DBShardGroup response will contain MinACU if specified. (d2d3328)
• client-sagemaker: This release adds support for Amazon EMR Serverless applications in SageMaker Studio for running data processing jobs. (b43bb89)
• client-ssm-quicksetup: This release adds API support for the QuickSetup feature of AWS Systems Manager (71f373d)