# Editing dynamic field name in logstash

**URL:** <https://discuss.elastic.co/t/editing-dynamic-field-name-in-logstash/362843>\
**Category:** Logstash\
**Created:** [July 10, 2024, 6:53am UTC](https://discuss.elastic.co/t/editing-dynamic-field-name-in-logstash/362843 "2024-07-10T06:53:36Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![sahere37](https://avatars.discourse-cdn.com/v4/letter/s/b2d939/32.png) [@sahere37](https://discuss.elastic.co/u/sahere37)\
**Post date:** [July 10, 2024, 6:53am UTC](https://discuss.elastic.co/t/editing-dynamic-field-name-in-logstash/362843/1 "2024-07-10T06:53:36Z")

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hi, I have a log in which each line has a field with different name like below. is it possible to change all of these field's names to just "day"?  
\<123\>day=.... ===\> day=....  
\<678\>day=.... ===\> day=....

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<div class="post-metadata">

**Author:** ![Alex\_Salgado-Elastic](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/alex_salgado-elastic/32/103081_2.png) [@Alex\_Salgado-Elastic](https://discuss.elastic.co/u/Alex_Salgado-Elastic)\
**Post date:** [July 11, 2024, 9:22pm UTC](https://discuss.elastic.co/t/editing-dynamic-field-name-in-logstash/362843/2 "2024-07-11T21:22:07Z")

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> [@sahere37](#):
>
> hi, I have a log in which each line has a field with different name like below. is it possible to change all of these field's names to just "day"?  
> \<123\>day=.... ===\> day=....  
> \<678\>day=.... ===\> day=....

Try with `gsub` filter:

> **[Mutate filter plugin | Logstash Reference \[8.14\] | Elastic](https://www.elastic.co/guide/en/logstash/current/plugins-filters-mutate.html)**