Does log4j support JSON format?

Question

Is it possible to let log4j output its logging in JSON format by only altering the log4j.properties.xml configuration file?
I make use of an old application tha

Answer 1

this is official JSON layout

https://github.com/logstash/log4j-jsonevent-layout

1) Add maven dependency https://mvnrepository.com/artifact/net.logstash.log4j/jsonevent-layout

    net.logstash.log4j
    jsonevent-layout
    1.7  

2) Add configuration to your log4j.properties file

 log4j.rootCategory=WARN, RollingLog
 log4j.appender.RollingLog=org.apache.log4j.DailyRollingFileAppender
 log4j.appender.RollingLog.Threshold=TRACE
 log4j.appender.RollingLog.File=api.log
 log4j.appender.RollingLog.DatePattern=.yyyy-MM-dd
 log4j.appender.RollingLog.layout=net.logstash.log4j.JSONEventLayoutV1