How to upload an image to VK using JavaScript?

Question

JavaScript

Generally. There is an image, can it be uploaded to VK to the user on the wall or in a separate album (no matter where) using Javascript ? Please describe in more detail. If not difficult)

Answer 1

From the browser directly to VK will not work . From nodejs or Electron - easily.
The key point here is the response of the VK server to upload a picture file to them. They respond without CORS headers and the browser considers such a response unsafe, making it inaccessible to JS scripts.
Uploading files to VK is well described in their documentation . Three steps:
All this is easily done in JavaScript, but the security policy of browsers does not allow receiving a response from a foreign server if it is not accompanied by special HTTP headers. And VK does not give them for some of its own “security” reasons, as their technical support answered me:
Therefore, you can only upload through your own server.