Benchmark Data

Warnings

Implied

MessageKey Wrong message key (should be 'msg')

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

Phsym Zerolog		`message`

Samber Zerolog		`message`

Svcrunner Jsonlog		`message`

SourceCaller Source data logged as 'caller' instead of 'source'

Some handlers return source data as a single string on the caller field in the format <file>:<line> where <file> and <line> correspond to the File and Line fields of the source data group and Function is not provided.

Chanchal Zap		reflect/value.go:596
	{ "caller": "reflect/value.go:596", "level": "info", "msg": "This is a message", "time": "2025-02-16T01:41:19Z" }
Phsym Zerolog		/opt/hostedtoolcache/go/1.22.12/x64/src/reflect/value.go:596
	{ "caller": "/opt/hostedtoolcache/go/1.22.12/x64/src/reflect/value.go:596", "level": "info", "message": "This is a message", "time": "2025-02-16T01:41:19Z" }
Samber Zap		reflect/value.go:596
	{ "caller": "reflect/value.go:596", "level": "info", "msg": "This is a message", "time": "2025-02-16T01:41:19Z" }

SourceKey Source data not logged when AddSource flag set

Handlers should log source data when the slog.HandlerOptions.AddSource flag is set.

Svcrunner Jsonlog		no 'source' key
	{ "level": "INFO", "message": "This is a message", "time": "2025-02-16T01:41:19.497315904Z" }

Suggested

LevelCase Log level in lowercase

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.

Chanchal Zap		'info'

Phsym Zerolog		'info'

Samber Logrus		'info'

Samber Zap		'info'

Samber Zerolog		'info'

Test Source Key

Warnings