Speech-to-Text API with OpenAI GPT-4o-mini Transcribe

This n8n workflow creates a simple yet powerful backend API for speech-to-text functionality. It exposes a secure webhook endpoint that accepts audio file uploads from any application, processes them via OpenAI's GPT-4o-mini model for high-accuracy transcription, and returns the resulting text in a clean JSON response. A sticky note within the workflow provides complete HTML code for a functional audio recorder interface, enabling immediate testing or integration into your projects without additional setup.

Key benefits include rapid deployment without server management, decoupling of frontend and backend logic for easier maintenance, and a scalable pattern for wrapping AI services into custom APIs. It saves significant development time by handling file upload, transcription, and response formatting automatically, making it ideal for developers seeking to add voice features quickly.

Use cases span web/mobile apps needing voice input (e.g., note-taking, customer support chatbots), no-code tools embedding transcription, and API services for voice analytics. In commerce/procurement, it supports voice-ordered purchasing, meeting transcriptions for negotiations, or hands-free inventory logging. The workflow's lean design ensures low latency and cost-efficiency with GPT-4o-mini.