5. Binary Data & File Handling

// After downloading a CSV with HTTP Request node:
// Use the "Spreadsheet File" node with:
// - Operation: Read From File
// - File Format: CSV
// - Header Row: true

// Or in Code node:
const csv = $input.first().binary.data;
const text = Buffer.from(csv.data, "base64").toString();
const lines = text.split("\n");
const headers = lines[0].split(",");

return lines.slice(1).filter(l => l.trim()).map(line => {
  const values = line.split(",");
  const obj = {};
  headers.forEach((h, i) => obj[h.trim()] = values[i]?.trim());
  return { json: obj };
});