How do I add fields to log4j2's JSON logs
This can be archived simply via the the config file.
See my log4j2.yaml:
Configuration: status: warn appenders: Console: name: STDOUT JsonLayout: complete: false compact: true eventEol: true KeyValuePair: - key: extrainformation value: Some very important stuff I need to include - key: extrainformation2 value: Some other very important stuff I need to include Loggers: Root: level: "warn" AppenderRef: ref: STDOUTCustom fields are always last, in the order they are declared. The values support lookups
Like @alan7678 said -
A custom layout was also the solution for me.
@Plugin(name = "ExtendedJsonLayout", category = Node.CATEGORY, elementType = Layout.ELEMENT_TYPE, printObject = true)public class ExtendedJsonLayout extends AbstractJacksonLayout {// Lots of code!}I created a Log4j2 layout plugin called "extended-jsonlayout". You can include it in your project with Maven or Gradle. Check it out here -