Nightcoreify

A TypeScript library for converting YouTube audio to nightcore. Pass a YouTube URL and get back processed audio with higher pitch and faster tempo.

Installation

npm install nightcoreify

Prerequisites

FFmpeg is required for audio processing:

# macOS
brew install ffmpeg

# Ubuntu/Debian  
sudo apt install ffmpeg

# Windows
# Download from https://ffmpeg.org and add to PATH

Verify installation:

ffmpeg -version

Usage

Basic Usage

import nightcoreify from 'nightcoreify';

async function example() {
  const youtubeUrl = 'https://youtube.com/watch?v=dQw4w9WgXcQ';
  const result = await nightcoreify(youtubeUrl);
  
  if (result) {
    // result is a Buffer containing MP3 audio data
    fs.writeFileSync('nightcore.mp3', result);
    console.log('Nightcore generated successfully');
  } else {
    console.log('Failed to process video');
  }
}

API Integration

import nightcoreify from 'nightcoreify';

app.post('/nightcore', async (req, reply) => {
  try {
    const { youtubeUrl } = req.body;
    const audioBuffer = await nightcoreify(youtubeUrl);
    
    if (!audioBuffer) {
      return reply.code(400).send({ error: 'Failed to process video' });
    }
    
    reply
      .type('audio/mpeg')
      .header('Content-Disposition', 'attachment; filename="nightcore.mp3"')
      .send(audioBuffer);
      
  } catch (error) {
    reply.code(500).send({ error: 'Processing failed' });
  }
});

API Reference

nightcoreify(youtubeUrl: string): Promise<Buffer | false>

Parameters:

• youtubeUrl - Valid YouTube URL

Returns:

• Buffer - MP3 audio data with nightcore processing applied
• false - If processing fails

Supported URL formats:

• https://youtube.com/watch?v=VIDEO_ID
• https://www.youtube.com/watch?v=VIDEO_ID
• https://youtu.be/VIDEO_ID

How It Works

1. Download - Extracts highest quality audio from YouTube
2. Convert - Converts to MP3 using ffmpeg
3. Process - Applies speed and pitch adjustments
4. Return - Provides processed audio as Buffer

Temporary files are created during processing and cleaned up automatically.

Error Handling

try {
  const result = await nightcoreify(url);
  if (result === false) {
    // Handle processing failure
  }
} catch (error) {
  // Handle network errors, invalid URLs, etc.
}

Troubleshooting

"ffmpeg not found" - Install ffmpeg and ensure it's in your PATH

Processing fails - Video may be private, restricted, or unavailable

"Could not extract functions" - YouTube player updates can break downloading; try updating the package

License

ISC

---

Note: This library is for educational and personal use. Please respect YouTube's Terms of Service and copyright laws when using this tool.