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Resolving Deepgram API 400 - Bad Request Error in n8n

When using the Deepgram API in n8n to process MP3 files from another HTTP request, users may encounter a "400 - Bad Request" error. This error often stems from issues related to audio encoding or unsupported data formats. Below are steps and recommendations to resolve this issue effectively.

Understanding the Error

The specific error message returned by the Deepgram API typically indicates that the audio data submitted is "corrupt or unsupported." Common reasons for this error include:

  • Incorrect or missing audio encoding in the query parameters.
  • Mismatch between the actual audio encoding (e.g., MP3) and the selected audio encoding in the API request.

Steps to Resolve

  1. Verify Audio Encoding and Sample Rate

    • Ensure that both encoding and sample_rate settings are correctly configured in your query parameters. These settings are crucial for the API to process the audio correctly.

  2. Adjust Encoding Parameters

    • If you have set encoding to a value like linear16, but your audio file is MP3, this discrepancy will cause an error. Refer to Deepgram's supported audio encoding values to configure the correct encoding value for your audio file type.

  3. Test with Sample Files

    • As part of troubleshooting, try using a sample audio file with known good parameters and verify if the API processes it successfully. This action can help identify if the issue is file-specific.

Conclusion

Addressing encoding mismatches or improperly set parameters are common solutions to resolve the Deepgram "400 - Bad Request" errors. If issues persist or the system behavior seems inconsistent, reach out to your Deepgram support representative (if you have one) or visit the Deepgram community for assistance.

By following the recommendations above, the integration between n8n and the Deepgram API can be configured to effectively handle various audio file formats without encountering errors.

References