Setting Up the Node.js Environment
- Ensure you have Node.js and npm installed on your machine. You can verify this by running
node -v and npm -v in the terminal to check their versions.
- Create a new directory for your project and navigate into it. For instance, use
mkdir watson-stt && cd watson-stt.
- Initialize a new Node.js project by executing
npm init -y. This creates a package.json file with default settings.
Installing IBM Watson SDK
Additionally, you need to install the axios library for making HTTP requests:
```shell
npm install axios
```
Authentication and Configuration
Building the Node.js Application
- Create a new JavaScript file, say
app.js, within your project directory.
- In your
app.js, require the necessary modules and configure the IBM Watson Speech to Text service:
```javascript
require('dotenv').config();
const fs = require('fs');
const SpeechToTextV1 = require('ibm-watson/speech-to-text/v1');
const { IamAuthenticator } = require('ibm-watson/auth');
const speechToText = new SpeechToTextV1({
authenticator: new IamAuthenticator({
apikey: process.env.API_KEY,
}),
serviceUrl: process.env.API_URL,
});
```
Converting Audio to Text
- Prepare an audio file for testing and place it in your project directory. Ensure it is in a supported format such as WAV, FLAC, or MP3.
- Add the following code to handle the conversion from speech to text:
```javascript
const transcribeAudio = async (audioFilePath) => {
const params = {
audio: fs.createReadStream(audioFilePath),
contentType: 'audio/wav', // Change content-type as per your audio file format
};
try {
const response = await speechToText.recognize(params);
const transcription = response.result.results
.map(result => result.alternatives[0].transcript)
.join('\n');
console.log('Transcription:', transcription);
} catch (error) {
console.error('Error transcribing audio:', error);
}
};
// Transcribe a sample audio file
transcribeAudio('sample-audio.wav');
```
Run Your Application
- Run your application by using the command
node app.js from your terminal. Observe the console for the transcription output of your audio file.
- Verify the transcription and adjust the content type if necessary by checking the format of your audio files.
