download amazon item price history

instructions.md

1. Goto pricehistory.app and enter the url of item you want the price history of.
2. Open the browser console and run the following function.

function downloadPriceDataIntoCSV() {
  
    price_series = chart.data.datasets.filter(item => item.label == "Prices")[0].data
    
    // Create CSV header
    const headers = ['price,datetime\n'];
    
    // Convert data to CSV rows
    const csvRows = price_series.map(item => 
        `${item.y},${item.x}`
    );

    // Combine headers and rows
    const csvContent = headers.concat(csvRows).join('\n');

    // Create blob and download link
    const blob = new Blob([csvContent], { type: 'text/csv;charset=utf-8;' });
    const link = document.createElement('a');
    
    // Create download URL
    const url = window.URL.createObjectURL(blob);
    link.setAttribute('href', url);
    link.setAttribute('download', 'data.csv');
    
    // Append link, trigger download, and remove link
    document.body.appendChild(link);
    link.click();
    document.body.removeChild(link);
}

// Usage
downloadPriceDataIntoCSV();