Salesforce: Connected App - ( OAuth2.0 Debugging Tool ! =)
Finally a community Salesforce guide, that works! A minimalist tool for testing and debugging OAuth2 configurations for Salesforce Connected Apps rapidly. This tool provides an interactive web interface and backend service (running on port 3000) to help you quickly validate OIDC metadata, construct authorization requests with PKCE support

Finally a community Salesforce guide, that works! A minimalist tool for testing and debugging OAuth2 configurations for Salesforce Connected Apps rapidly.
This tool provides an interactive web interface and backend service (running on port 3000) to help you quickly validate OIDC metadata, construct authorization requests with PKCE support