OAuth 2.1 vs. 2.0: Key Differences and Enhancements

OAuth 2.0 is an authorization protocol that allows third-party applications to access user resources, such as their account information. OAuth 2.1 is an improved version of OAuth 2.0 that aims to enhance security and usability.

Here are the key differences between OAuth 2.0 and OAuth 2.1:

1. Enhanced Security: The OAuth 2.1 standard explicitly prohibits the use of insecure authorization methods, such as password grants and client credentials grants, resulting in improved security.

2. Simplified Client Development: OAuth 2.1 defines standard processes and parameters, simplifying client development.

3. Risk Assessment: OAuth 2.1 introduces a risk assessment mechanism to ensure the legitimacy and security of authorization requests.

4. Clear Permission Scope: OAuth 2.1 clearly defines the scope of permissions, providing users with a better understanding of the resources authorized applications can access.

5. Reduced Authorization Complexity: OAuth 2.1 defines standard authorization grant types, reducing the complexity of authorization processes.

6. Improved Error Handling: OAuth 2.1 defines standard error codes, resulting in clearer and more standardized error handling.