"The context is provided to support applications that provide logging information along the call chain. In a break with usual Go practice, the Handle method should not treat a canceled context as a signal to stop work."

The field name of the "message" key should be msg.

• Constant values are defined for slog/log
  
• Field values are defined for the JSONHandler.Handle() implementation

Each JSON log record contains the logging level of the log statement as a string. Different handlers provide that string in uppercase or lowercase. Documentation for slog.Level says that its String() and MarshalJSON() methods will return uppercase but UnmarshalJSON() will parse in a case-insensitive manner.