deno freshにおいてfetch APIでbase64文字列を受け取ることができない

    e.preventDefault();
    const imageElement = document.getElementById(
      "upload-form",
    ) as HTMLFormElement;
    const image = imageElement.files[0];

    const formData = new FormData();
    formData.append("files", image);
    const response = await fetch("http://127.0.0.1:8001/files/", {
      method: "POST",
      body: formData,
      mode: "no-cors",
    });
    console.log(await response.json());
   

from typing import Annotated
from creategif import CreateAsciiArt

from fastapi import FastAPI, File, Request, status

from fastapi.exceptions import RequestValidationError
from fastapi.responses import JSONResponse

app = FastAPI()

@app.exception_handler(RequestValidationError)
async def handler(request: Request, exc: RequestValidationError):
    print(exc)
    return JSONResponse(content={}, status_code=status.HTTP_422_UNPROCESSABLE_ENTITY)


@app.post("/files/")
async def create_files(files: Annotated[bytes, File()]):
    # ↓画像を加工して、base64文字列に保存
    output = CreateAsciiArt().create_ascii_art_from_binary(files)
    return {"base64": output}