@aws-sdk/client-comprehend

What is @aws-sdk/client-comprehend?

@aws-sdk/client-comprehend is an AWS SDK for JavaScript package that allows developers to interact with Amazon Comprehend, a natural language processing (NLP) service. This package provides functionalities for text analysis, including language detection, sentiment analysis, entity recognition, key phrase extraction, and topic modeling.

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

Language Detection

This feature allows you to detect the dominant language in a given text. The code sample demonstrates how to use the DetectDominantLanguageCommand to identify the language of the input text.

const { ComprehendClient, DetectDominantLanguageCommand } = require('@aws-sdk/client-comprehend');

const client = new ComprehendClient({ region: 'us-east-1' });
const params = { Text: 'Hello, how are you?' };
const command = new DetectDominantLanguageCommand(params);
client.send(command).then(response => console.log(response)).catch(error => console.error(error));

Sentiment Analysis

This feature allows you to analyze the sentiment of a given text, determining whether it is positive, negative, neutral, or mixed. The code sample shows how to use the DetectSentimentCommand to analyze the sentiment of the input text.

const { ComprehendClient, DetectSentimentCommand } = require('@aws-sdk/client-comprehend');

const client = new ComprehendClient({ region: 'us-east-1' });
const params = { Text: 'I am very happy today!', LanguageCode: 'en' };
const command = new DetectSentimentCommand(params);
client.send(command).then(response => console.log(response)).catch(error => console.error(error));

Entity Recognition

This feature allows you to identify entities such as people, places, and organizations in a given text. The code sample demonstrates how to use the DetectEntitiesCommand to recognize entities in the input text.

const { ComprehendClient, DetectEntitiesCommand } = require('@aws-sdk/client-comprehend');

const client = new ComprehendClient({ region: 'us-east-1' });
const params = { Text: 'Amazon Web Services is a subsidiary of Amazon.', LanguageCode: 'en' };
const command = new DetectEntitiesCommand(params);
client.send(command).then(response => console.log(response)).catch(error => console.error(error));

Key Phrase Extraction

This feature allows you to extract key phrases from a given text. The code sample shows how to use the DetectKeyPhrasesCommand to extract key phrases from the input text.

const { ComprehendClient, DetectKeyPhrasesCommand } = require('@aws-sdk/client-comprehend');

const client = new ComprehendClient({ region: 'us-east-1' });
const params = { Text: 'Machine learning is a fascinating field of study.', LanguageCode: 'en' };
const command = new DetectKeyPhrasesCommand(params);
client.send(command).then(response => console.log(response)).catch(error => console.error(error));

Topic Modeling

This feature allows you to identify topics in a collection of documents. The code sample demonstrates how to use the StartTopicsDetectionJobCommand to start a topic detection job with input and output data stored in Amazon S3.

const { ComprehendClient, StartTopicsDetectionJobCommand } = require('@aws-sdk/client-comprehend');

const client = new ComprehendClient({ region: 'us-east-1' });
const params = { InputDataConfig: { S3Uri: 's3://your-bucket/input-data' }, OutputDataConfig: { S3Uri: 's3://your-bucket/output-data' }, DataAccessRoleArn: 'arn:aws:iam::your-account-id:role/your-role', NumberOfTopics: 10 };
const command = new StartTopicsDetectionJobCommand(params);
client.send(command).then(response => console.log(response)).catch(error => console.error(error));

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

natural

The 'natural' package is a general natural language processing (NLP) library for JavaScript. It provides functionalities such as tokenization, stemming, classification, and more. Unlike @aws-sdk/client-comprehend, which is a cloud-based service, 'natural' is a local library that does not require internet access or an AWS account.

compromise

The 'compromise' package is a lightweight NLP library for JavaScript. It offers features like part-of-speech tagging, named entity recognition, and text normalization. While it provides some similar functionalities to @aws-sdk/client-comprehend, it operates entirely on the client side and does not offer the same level of scalability or integration with other AWS services.

wink-nlp

The 'wink-nlp' package is a fast and accurate NLP library for JavaScript. It includes features such as tokenization, named entity recognition, sentiment analysis, and more. Unlike @aws-sdk/client-comprehend, 'wink-nlp' is designed for local processing and does not require cloud infrastructure, making it suitable for applications where data privacy is a concern.

README

@aws-sdk/client-comprehend

Description

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

Amazon Comprehend is an AWS service for gaining insight into the content of documents. Use these actions to determine the topics contained in your documents, the topics they discuss, the predominant sentiment expressed in them, the predominant language used, and more.

Installing

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

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

Getting Started

Import

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

// ES5 example
const { ComprehendClient, BatchDetectDominantLanguageCommand } = require("@aws-sdk/client-comprehend");

// ES6+ example
import { ComprehendClient, BatchDetectDominantLanguageCommand } from "@aws-sdk/client-comprehend";

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 difference commands.
const client = new ComprehendClient({ region: "REGION" });

const params = {
  /** input parameters */
};
const command = new BatchDetectDominantLanguageCommand(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) => {
  // proccess 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-comprehend";
const client = new AWS.Comprehend({ region: "REGION" });

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

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

// callbacks.
client.batchDetectDominantLanguage(params, (err, data) => {
  // proccess 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-comprehend 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.