axios cannot get only response of base64 but can get the others data - reactjs

Question

First, I sent an image path from react to Django by using the axios of POST method.
Next, I edited the image in Django, and returned edited images that were converted into base64 to react.
like this.
/* this is view.py in Django */
class SquareCognitionSet(viewsets.ViewSet):
#action(methods=['POST'], detail=False, name='Edit image')
def show(self, request):
input = request.data['input']
edited_image = edit.main(input) // my user-defined function. return base64 after edit image.
data = {"message": "Got base64", "base": edited_image, "type": imghdr.what(input)}
return Response(data=data)
No problem so far.
Promlem is from here.
I cannot get only base64 data of response that was sent from Django.
However, axios could get response from Django. I confirmed console.log()
/*this is react*/
useEffect(()=>{
async function check(ImagePath: string) {
window.electronAPI.server_on(); // electron starts server to work axios
await axios.post("http://127.0.0.1:8000/ImageEdit/edit/", {
input: ImagePath // input value of image path
})
.then((response)=>{
console.log("success: ", response); // <-- here, I confirmed response
})
this is result of console.log().
Then I run
console.log("base64: ", response.data.base);
However, nothing is shown. Even the text of "base64: " is disappear.
What I tried.
I tried whether I can take out the others value sent from Django.
I added value {"message": "Got base64"} in response of Django.
Then, I take out value like
console.log("message: ", response.data.message);
console.log("status: ", response.status);
They are successfuly shown. So, This may be problem of base64.
I confirmed capacity in POST method
I checked the length of base64 in Django. This was 34789440.
So, I made string value that has length of 40000000: t = "A"410**7
Then, I added this into response in Django, and I could receive it successfully in react.
convert to JSON before being sent from Django
I added the following code into view.py in Django.
...
data = {"message": "Got base64", "base": edited_image, "type": imghdr.what(input)}
params = json.dumps(data)
return Response(data=data)
The result was almost same the above my problem. console.log("success: ", response); showed
However, all response data became undefined. Even response.status became undefined.
check type of data
base64 was 'str'.
Why couldn't I take out only base64???
I googled it including how to use axios, Django post method and so on.
But I don't know how to fix it.
Thanks in advance.