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Amazon Comprehend
Developer Guide

AWS Documentation » Amazon Comprehend » Developer Guide » API Reference » Actions » Amazon Comprehend » DetectSentiment

DetectSentiment

Inspects text and returns an inference of the prevailing sentiment (POSITIVE, NEUTRAL, MIXED, or NEGATIVE).

Request Syntax

{
   "LanguageCode": "string",
   "Text": "string"
}

Request Parameters

For information about the parameters that are common to all actions, see Common Parameters.

The request accepts the following data in JSON format.

LanguageCode

The language of the input documents. You can specify any of the primary languages supported by Amazon Comprehend: German ("de"), English ("en"), Spanish ("es"), French ("fr"), Italian ("it"), or Portuguese ("pt"). All documents must be in the same language.

Type: String

Valid Values: en | es

Required: Yes

Text

A UTF-8 text string. Each string must contain fewer that 5,000 bytes of UTF-8 encoded characters.

Type: String

Length Constraints: Minimum length of 1.

Required: Yes

Response Syntax

{
   "Sentiment": "string",
   "SentimentScore": { 
      "Mixed": number,
      "Negative": number,
      "Neutral": number,
      "Positive": number
   }
}

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.

Sentiment

The inferred sentiment that Amazon Comprehend has the highest level of confidence in.

Type: String

Valid Values: POSITIVE | NEGATIVE | NEUTRAL | MIXED

SentimentScore

An object that lists the sentiments, and their corresponding confidence levels.

Type: SentimentScore object

Errors

For information about the errors that are common to all actions, see Common Errors.

InternalServerException

An internal server error occurred. Retry your request.

HTTP Status Code: 500

InvalidRequestException

The request is invalid.

HTTP Status Code: 400

TextSizeLimitExceededException

The size of the input text exceeds the limit. Use a smaller document.

HTTP Status Code: 400

UnsupportedLanguageException

Amazon Comprehend can't process the language of the input text. For all custom entity recognition APIs (such as CreateEntityRecognizer), only English is accepted. For most other APIs, such as those for Custom Classification, Amazon Comprehend accepts text in all supported languages. For a list of supported languages, see Languages Supported in Amazon Comprehend.

HTTP Status Code: 400

Example

Detect sentiment

If the input text is "Today is my birthday, I am so happy.", the operation returns the following response: 

{
    "SentimentScore": {
        "Mixed": 0.0033542951568961143,
        "Positive": 0.9869875907897949,
        "Neutral": 0.008563132025301456,
        "Negative": 0.0010949420975521207
    },
    "Sentiment": "POSITIVE",
 }   
}

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: