Invalid Credentials for OAUTH from Youtube API

Question

I am getting 401 Invalid Credentials error trying to use the Youtube API in the OAuth 2.0 Playground.

Response is:

{
  \"error\": {
    \"code\": 40         


        

Answer 1

You have to choose the "Use your own OAuth credentials" option in the settings of the OAuth Playground (link at the top right corner).

You also need to add the following URL to the list of Redirect URIs of you project in the Developers Console:

https://developers.google.com/oauthplayground

If you do that, you don't need to pass the API key.