How to Enforce File Format Restrictions for API Integration (e.g., MP3 in Speakatoo)

I’m working on integrating Speakatoo’s API into a widget and need to ensure that users can only upload or process files in the required MP3 format.

What are the best practices for enforcing this restriction on both the frontend and backend to prevent unsupported formats from being submitted?

Any insights, examples, or recommendations for managing such file format requirements effectively would be greatly appreciated!

Enforcing file format restrictions for API integration, like allowing only MP3 in Speakatoo, is crucial for maintaining compatibility and performance. A good approach is to implement MIME type validation and check file extensions on both the frontend and backend. Using libraries like file-type (Node.js) or magic (Python) can help verify the actual file format instead of just relying on extensions. Also, setting up proper error handling will ensure users get clear feedback if they upload an unsupported file. Anyone tried additional security measures for this?