## 8

### Bugs
- No explicit bugs identified within the code provided.

### Optimizations
- The `public` access modifier is unnecessary in extensions if the enclosing type is already public.
- Consider using `DateFormatter` for handling date formats if the date string needs to be human-readable.
- The naming convention for variable `expire_time` in the `CodingData` struct could be `camelCase` consistent with Swift's convention.

### Good points
- The use of `Codable` ensures easy conversion of data to and from JSON or other formats.
- The code clearly defines a structure for an authentication token and encapsulates its properties well.
- `isExpired` computed property provides a readable way to check expiration status.

### Summary
The code provides a clear and efficient structure for handling authentication tokens. It uses Swift's features effectively, such as `Codable` for easy serialization and `extension` for organizing code. The implementation can benefit slightly from adhering to naming conventions and removing unnecessary access modifiers.

### Open source alternatives
- [JWT.swift](https://github.com/IBM-Swift/Swift-JWT) - A Swift library for JSON Web Tokens.
- [Vapor's JWT Package](https://github.com/vapor/jwt) - Provides comprehensive JWT functionalities in Swift.