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Speech Emotion Recognition API

Detect the emotion expressed in an uploaded audio file, along with a confidence score and a full breakdown across all supported emotions.

Base URL​

https://api.genderrecognition.com

Supported emotions​

  • angry
  • disgusted
  • fearful
  • happy
  • neutral
  • other
  • sad
  • surprised

Endpoint​

POST /v1/speech-emotion/api

Headers​

apiKey: YOUR_API_KEY
Content-Type: multipart/form-data

Body​

FieldTypeRequiredDescription
filefileYesAudio file to analyze.

Example​

curl -X POST "https://api.genderrecognition.com/v1/speech-emotion/api" \
  -H "apiKey: YOUR_API_KEY" \
  -F "file=@audio.wav"

Response​

{
  "success": true,
  "predicted_emotion": "happy",
  "confidence": 87,
  "expressions": {
    "angry": 2,
    "disgusted": 1,
    "fearful": 1,
    "happy": 87,
    "neutral": 6,
    "other": 0,
    "sad": 2,
    "surprised": 1
  },
  "remainingRequests": 2999
}

Response fields​

FieldTypeDescription
successbooleantrue when the audio was processed successfully.
predicted_emotionstringThe most likely emotion detected in the audio.
confidenceintegerConfidence percentage for predicted_emotion, from 0 to 100.
expressionsobjectPercentage score for every supported emotion.
remainingRequestsintegerAPI requests remaining after this successful request is deducted.

Values are whole-number percentages, not decimals between 0 and 1.

Error cases​

Missing API key​

{
  "error": "API key is required"
}

Invalid API key​

{
  "error": "Invalid API key"
}

Missing file​

{
  "error": "No file uploaded"
}

File too large​

{
  "error": "File too large"
}

Invalid file type​

{
  "error": "Invalid file type. Allowed formats: WAV, MP3, FLAC, MP4, OGG, AIFF"
}

Audio conversion failed​

Returned when the file has an allowed extension but ffmpeg cannot convert it (for example, a corrupt or unreadable file):

{
  "error": "Audio conversion failed: <details>"
}

Quota exceeded​

{
  "error": {
    "code": "RATE_LIMIT_EXCEEDED",
    "message": "You have exceeded your free tier limit of 50 requests.",
    "detailedMessage": "Insufficient remaining requests. Required: 1, Available: 0",
    "details": {
      "limit": 50,
      "used": 50,
      "reset_date": "2026-07-01T00:00:00.000Z"
    },
    "suggested_action": "Please upgrade to a premium plan to continue using the API."
  }
}

Processing failed​

{
  "error": "Speech emotion detection failed"
}

Notes​

  • The backend accepts common audio formats such as WAV, MP3, FLAC, MP4, OGG, and AIFF, and converts non-WAV files before analysis.
  • Audio uploads use the file field and must be 10 MB or smaller.
  • A request is deducted only after the prediction service returns successfully.