Color Converter for Node.js Developers

// Hex ↔ RGB ↔ HSL conversions (no dependencies)
function hexToRgb(hex) {
  const n = parseInt(hex.slice(1), 16);
  return { r: (n >> 16) & 255, g: (n >> 8) & 255, b: n & 255 };
}

function rgbToHex(r, g, b) {
  return '#' + [r, g, b].map(v => v.toString(16).padStart(2, '0')).join('');
}

function rgbToHsl(r, g, b) {
  r /= 255; g /= 255; b /= 255;
  const max = Math.max(r, g, b), min = Math.min(r, g, b);
  const l = (max + min) / 2;
  const d = max - min;
  const s = d === 0 ? 0 : d / (1 - Math.abs(2 * l - 1));
  let h = 0;
  if (d !== 0) {
    if (max === r) h = ((g - b) / d) % 6;
    else if (max === g) h = (b - r) / d + 2;
    else h = (r - g) / d + 4;
  }
  return { h: Math.round(h * 60), s: Math.round(s * 100), l: Math.round(l * 100) };
}