How to send files to the backend

Vault
#1

Hello，

In this codes, “fileuploader” is a form and “attachment” is a simplevault.

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My code threw the following error at runtime

Uncaught SyntaxError: Unexpected token ‘<’, "<!DOCTYPE "... is not valid JSON at JSON.parse () at request.onloadend (app.js:2190:1183)

I am using the Laravel framework for backend development.
I would be grateful if you could help me resolve this issue.

#2

Could you please, provide a complete demo with your backend script for the file uploading.