csvdrop/src/index.ts

./jsontocsv/README.md

export function jsontocsv(
  data: Record<string, any>[],
  filename: string = "data.csv"
): void {
  if (
    !Array.isArray(data) ||
    data.length === 0 ||
    typeof data[0] !== "object" ||
    Array.isArray(data[0])
  ) {
    throw new Error("Data must be a non-empty array of objects.");
  }

  const headers = Object.keys(data[0]);
  const csvRows = [
    headers.join(","), // CSV headers
    ...data.map((row) =>
      headers
        .map((field) => {
          const value = row[field];
          // Escape quotes and wrap value in double quotes
          return `"${String(value ?? "").replace(/"/g, '""')}"`;
        })
        .join(",")
    ),
  ];

  const csvContent = csvRows.join("\n");
  const blob = new Blob([csvContent], { type: "text/csv;charset=utf-8;" });
  const url = URL.createObjectURL(blob);

  const link = document.createElement("a");
  link.href = url;
  link.setAttribute(
    "download",
    filename.endsWith(".csv") ? filename : filename + ".csv"
  );
  document.body.appendChild(link);
  link.click();
  document.body.removeChild(link);
  URL.revokeObjectURL(url);
}