# Want to Change a Field Name (Not a Field Value)
**URL:** https://discuss.elastic.co/t/want-to-change-a-field-name-not-a-field-value/28563
**Category:** Logstash
**Created:** [September 2, 2015, 9:34pm UTC](https://discuss.elastic.co/t/want-to-change-a-field-name-not-a-field-value/28563 "2015-09-02T21:34:33Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@bhutchinson](https://discuss.elastic.co/u/bhutchinson)
#### Post date: [September 2, 2015, 9:34pm UTC](https://discuss.elastic.co/t/want-to-change-a-field-name-not-a-field-value/28563/1 "2015-09-02T21:34:33Z")
The useragent filter can be used to parse an Apache Access Log File and create a field named "browser". After running the user agent filter, how do I rename the field name from "browser" to "browser-name"? I am thinking that I use the mutate filter, but after reading the documentation I see that you can add a field and remove a field, how do I change a field name (not a field value)?
Can someone please give me a quick example of how I would use the mutate filter to rename a field from "browser" to "browser-name"?
---
### Author:  [@bhutchinson](https://discuss.elastic.co/u/bhutchinson)
#### Post date: [September 2, 2015, 10:32pm UTC](https://discuss.elastic.co/t/want-to-change-a-field-name-not-a-field-value/28563/2 "2015-09-02T22:32:29Z")
Nevermind. Figured it out using the following mutate filter.
> mutate {
>
> # rename field from 'name' to 'browser\_name'
>
> rename =\> { "name" =\> "browser\_name" }
> }
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 5:30am UTC](https://discuss.elastic.co/t/want-to-change-a-field-name-not-a-field-value/28563/3 "2017-07-06T05:30:19Z")