Speech Recognition Microservice (node.js)

A microservice that translates audio to text and generates notes using Google Cloud Speech-to-Text API and OpenAI.

Features

• Audio file upload and processing
• Speech-to-text conversion using Google Cloud Speech API
• Text processing with OpenAI
• CORS support for cross-origin requests
• File validation middleware
• Streaming audio processing

Prerequisites

• Node.js (v14 or higher)
• Google Cloud Platform account with Speech-to-Text API enabled
• OpenAI API key

Installation

1. Clone the repository:

git clone <repository-url>
cd speachRecognition

2. Install dependencies:

npm install

3. Create a .env file in the root directory with the following variables:

PORT=8080
GOOGLE_APPLICATION_CREDENTIALS=path/to/your/SpeechClient.json
OPENAI_API_KEY=your_openai_api_key

Project Structure

src/
├── CORS/
│   └── config.js         # CORS configuration
├── config/
│   └── SpeechClient.json # Google Cloud credentials
├── handlers/
│   ├── streamHandler.js  # Audio stream processing
│   ├── speechRecognize.js # Speech recognition logic
│   └── gptProcess.js     # OpenAI text processing
├── middleware/
│   ├── isFile.js        # File validation middleware
│   └── isAuth.js        # Authentication middleware
└── index.js             # Main application entry point

API Endpoints

POST /upload-audio

Upload and process audio files.

Request:

• Method: POST
• Content-Type: multipart/form-data
• Body:
  • voice: Audio file

Response:

• Success: 200 OK with processed text
• Error: 400 Bad Request or 500 Internal Server Error

Usage

1. Start the development server:

npm run dev

2. Start the production server:

npm start

The server will start on port 8080 (or the port specified in your .env file).

Dependencies

• @google-cloud/speech: ^6.5.0
• dotenv: ^16.4.5
• express: ^4.19.2
• multer: ^1.4.5-lts.1
• openai: ^4.40.0

Security Notes

• Keep your .env file secure and never commit it to version control
• Ensure your Google Cloud credentials are properly secured
• The service includes CORS configuration for secure cross-origin requests
• File validation middleware is implemented to ensure proper file uploads

License

ISC

Author

Bohdan Kukhar