# How to separate fields of a log on logstash with beats
**URL:** https://discuss.elastic.co/t/how-to-separate-fields-of-a-log-on-logstash-with-beats/161818
**Category:** Logstash
**Created:** [December 21, 2018, 9:11am UTC](https://discuss.elastic.co/t/how-to-separate-fields-of-a-log-on-logstash-with-beats/161818 "2018-12-21T09:11:30Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Askia\_Mohamed\_Kadri](https://discuss.elastic.co/u/Askia_Mohamed_Kadri)
#### Post date: [December 21, 2018, 9:11am UTC](https://discuss.elastic.co/t/how-to-separate-fields-of-a-log-on-logstash-with-beats/161818/1 "2018-12-21T09:11:31Z")
Hi everybody,
I'm trying to handle a multiline stacktrace using Filebeat and Logstash. I found the good pattern to use on Filebeat, but now I don't know how to separate the fields on Logstash after shipping the logs on Logstash with beat. Can you please help me?
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### Author:  [@Francisca\_Lima](https://discuss.elastic.co/u/Francisca_Lima)
#### Post date: [January 17, 2019, 5:12pm UTC](https://discuss.elastic.co/t/how-to-separate-fields-of-a-log-on-logstash-with-beats/161818/2 "2019-01-17T17:12:24Z")
You can use grok filter that allows you to define a pattern for data.
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### Author:  [@Askia\_Mohamed\_Kadri](https://discuss.elastic.co/u/Askia_Mohamed_Kadri)
#### Post date: [January 24, 2019, 3:18pm UTC](https://discuss.elastic.co/t/how-to-separate-fields-of-a-log-on-logstash-with-beats/161818/3 "2019-01-24T15:18:35Z")
Thanks @Francisca_Lima for your response. I found out the rigth solution already
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [February 21, 2019, 3:18pm UTC](https://discuss.elastic.co/t/how-to-separate-fields-of-a-log-on-logstash-with-beats/161818/4 "2019-02-21T15:18:38Z")
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