Manual OAuth Code Catcher is a specialized tool designed for developers working with OAuth 2.0 authorization code flows, particularly in scenarios where a web browser is unavailable. This Chrome extension operates by intercepting redirect URIs on localhost, allowing users to capture OAuth authorization codes effectively. It is particularly useful for headless clients and backend services that require a seamless method to obtain authorization codes without the need for a standard browser-based flow.

The tool works by listening for redirects to localhost during the OAuth process. Once the authorization server redirects the user's browser to the specified URI with the authorization code, Manual OAuth Code Catcher captures it and displays the code instantly. Users can then easily copy the code and provide it to their client application for exchanging it for an access token, simplifying the OAuth flow significantly.