Get Oauth token by jQuery AJAX - blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource

API
4

Not sure what you mean not possible

Step 1 - Redirect to Twitch
Step 2 - user accepts (or delcines) the account/clientID Link
Step 3 - under regular/code auth they come back to your redirecURL with a ?code
Step 4 - exchange the code for a token.

But if you are doing this in a pure JS environment then you use implict auth

Like this example Twitch Implicit Auth Example

Step 1 - Redirect to Twitch
Step 2 - user accepts (or delcines) the account/clientID Link
Step 3 - users comes back to your site with a #access_token

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