Audio transcription with Telegram and Groq Whisper

Short description Transcribe Telegram voice/audio messages to text using Groq’s OpenAI-compatible Whisper endpoint. Replies are delivered either as a Telegram message or as a downloadable .txt file, plug-and-play for n8n with minimal setup. Who’s it for / Uses - Educators, podcasters, interviewers, and support teams who need quick voice → text conversions. - Automating meeting notes, voice feedback, voicemail transcription, or speech logging. - Useful when you want transcripts pushed to chat or saved as files for archiving. How it works (overview) 1. Telegram Trigger — workflow starts on incoming message. 2. Switch (Audio/Voice) — detects voice or audio. If neither, replies “Wrong file type” and stops. 3. Telegram Download — downloads the audio using the fileid, outputs file path/binary. 4. Set Node (credentials + options) — stores GroqAPI and Telegramaccesstoken (required) and transcriptoutputformat (message or file). 5. HTTP Request → Groq (Whisper) — uploads audio (multipart/form-data) to Groq’s transcription endpoint and receives text. 6. Reply Switch — routes to either: - Message branch: send transcribed text as a Telegram message. - File branch: convert transcript to .txt and send as a document. Requirements - n8n instance (cloud or self-hosted) with internet access - Telegram bot token (create via BotFather) - Groq API key (create at https://console.groq.com/keys) - Basic n8n nodes: Telegram Trigger, Switch, Telegram Download, Set, HTTP Request, Convert to File, Telegram Send Message/Document Important setup & notes - Mandatory: Add GroqAPI and Telegramaccesstoken in the Set node (or use n8n Credentials). The workflow will fail without them. - Do not hardcode keys in HTTP node fields that will be exported/shared. Use Set fields or n8n Credentials. - Include sticky notes explaining each node (yellow note with full description recommended). Sticky notes should show setup steps and required fields. - Before publishing: remove personal IDs and secrets, test with sample voice messages, and verify Groq response schema to map the transcript field correctly. Security & best practices - Use n8n Credentials or environment variables in production. - Rotate API keys if they become exposed. - Keep the Set node private when sharing templates; instruct users to replace keys with their own.