Convert Logback Spring Properties to JSON

Logback via Spring Boot Properties

While Logback itself uses XML for configuration (logback-spring.xml), Spring Boot exposes many Logback settings through application.properties. These properties control log levels, file output, patterns, and rolling policies.

Example Properties

# Log Levels
logging.level.root=INFO
logging.level.com.example.service=DEBUG
logging.level.com.example.repository=TRACE
logging.level.org.springframework.web=WARN
logging.level.org.hibernate=ERROR

# File Output
logging.file.name=logs/application.log
logging.file.path=/var/log/myapp
logging.file.max-size=50MB
logging.file.max-history=30
logging.file.total-size-cap=1GB

# Console Pattern
logging.pattern.console=%clr(%d{yyyy-MM-dd HH:mm:ss.SSS}){faint} %clr(%-5level) %clr([%15.15t]){faint} %clr(%-40.40logger{39}){cyan} %clr(:){faint} %m%n

# File Pattern
logging.pattern.file=%d{yyyy-MM-dd HH:mm:ss.SSS} %-5level [%t] %logger{39} : %m%n

Nested JSON Output

The nested JSON clearly shows the logging level hierarchy:

{
  "logging": {
    "level": {
      "root": "INFO",
      "com": {
        "example": {
          "service": "DEBUG",
          "repository": "TRACE"
        }
      },
      "org": {
        "springframework": { "web": "WARN" },
        "hibernate": "ERROR"
      }
    },
    "file": {
      "name": "logs/application.log",
      "maxSize": "50MB",
      "maxHistory": 30
    }
  }
}

This tree view makes it easy to understand which packages have which log level, especially in large projects with dozens of package-specific log level overrides.