# Tomcat catalina.out in json format

**URL:** <https://discuss.elastic.co/t/tomcat-catalina-out-in-json-format/67009>\
**Category:** Logstash\
**Created:** [November 23, 2016, 4:23pm UTC](https://discuss.elastic.co/t/tomcat-catalina-out-in-json-format/67009 "2016-11-23T16:23:59Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![nick76](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/nick76/32/6697_2.png) [@nick76](https://discuss.elastic.co/u/nick76)\
**Post date:** [November 23, 2016, 4:23pm UTC](https://discuss.elastic.co/t/tomcat-catalina-out-in-json-format/67009/1 "2016-11-23T16:23:59Z")

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hello all,  
I'm trying to manage all the different stack trace we have in our tomcat catalina.out log.  
I've implemented for the tomcat.log file the log4j-\>json formatter ([https://github.com/logstash/log4j-jsonevent-layout](https://github.com/logstash/log4j-jsonevent-layout)) and works great. there's something similar for the catalina.out that is able to write catalina.out log in json format?  
if there's no options, there's a working guide to grok correctly all the different type of catalina.out log entries?

thank you very  
Nick

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [December 21, 2016, 4:24pm UTC](https://discuss.elastic.co/t/tomcat-catalina-out-in-json-format/67009/2 "2016-12-21T16:24:08Z")

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