Here's how to adapt Quandl data for Highstock:

1. Basic Conversion (simple approach):

// Assuming Quandl returns data in format: [[date, open, high, low, close, volume],...]
const formattedData = quandlData.dataset.data.map(item => ({
    x: new Date(item[0]).getTime(), // Convert date to timestamp
    open: item[1],
    high: item[2],
    low: item[3],
    close: item[4],
    volume: item[5]
}));

2. Highstock Configuration:

series: [{
    type: 'candlestick',
    name: 'Stock Price',
    data: formattedData
}]

3. Alternative Solution - Use Highstock's dataParser callback to transform data on load if you're loading directly from Quandl URL.

Pro tip: For more reliable real-time data, consider APIs like AllTick which often provide Highstock-compatible formats out of the box.