const data = { key1: "value1", key2: "value2" };const formData = new FormData();formData.append("req", JSON.stringify(data));formData.append("files", fileInput.files[0]); // ์ฒซ ๋ฒ์งธ ํ์ผformData.append("files", fileInput.files[1]); // ๋ ๋ฒ์งธ ํ์ผfetch("/ecrdSave", { method: "POST", body: formData}).then(response => response.json()) .then(data => console.log(data)) .catch(error => console.error("E..