How to convert captcha from VKontakte?

Question

JavaScript

I have a simple script for sending a message to a VKontakte group.
I wrote this script on my knee, purely in order to understand how to work with captcha.
I had no experience with captchas through api, so please do not throw stones.

I uploaded the script here: https://pastiebin.com/5e68a65b00dd3

The answer from the VKontakte server is as follows:



Documentation from VKontakte itself on working with captcha: https://vk.com/dev/captcha_error

The questions themselves:
1) Why, when sending captcha, with an already entered captcha key - an error occurs:

2) How to arrange all this so that everything is asynchronous. So that when I clicked on the "start" button - first I requested data from the captcha, and then after entering the data in the captcha key field - the message itself was sent in the group?

Answer 1

https://vk.com/dev/captcha_error
Read more carefully

In this case, you should ask the user to enter the text from the captcha_img image and repeat the request , adding the following parameters to it:
captcha_sid - received identifier
captcha_key - text entered by the user

And you again ask for captcha, but with parameters.
Those. you need to repeat the request that was executed with an error, where they ask you to enter a captcha, and not this nonsense.