# Add a field

**URL:** <https://discuss.elastic.co/t/add-a-field/41378>\
**Category:** Logstash\
**Created:** [February 10, 2016, 12:57pm UTC](https://discuss.elastic.co/t/add-a-field/41378 "2016-02-10T12:57:45Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![elastic-fan](https://avatars.discourse-cdn.com/v4/letter/e/779978/32.png) [@elastic-fan](https://discuss.elastic.co/u/elastic-fan)\
**Post date:** [February 10, 2016, 12:57pm UTC](https://discuss.elastic.co/t/add-a-field/41378/1 "2016-02-10T12:57:45Z")

</div>

hi,  
i am getting logs from the server and in logstash i would like to add a field and value for it how can i do this

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<div class="post-metadata">

**Author:** ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)\
**Post date:** [February 10, 2016, 1:08pm UTC](https://discuss.elastic.co/t/add-a-field/41378/2 "2016-02-10T13:08:34Z")

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For example like this:

```auto
filter {
  mutate {
    add_field => {
      "fieldname" => "fieldvalue"
    }
  }
}

```

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<div class="post-metadata">

**Author:** ![elastic-fan](https://avatars.discourse-cdn.com/v4/letter/e/779978/32.png) [@elastic-fan](https://discuss.elastic.co/u/elastic-fan)\
**Post date:** [February 10, 2016, 2:04pm UTC](https://discuss.elastic.co/t/add-a-field/41378/3 "2016-02-10T14:04:05Z")

</div>

> [@magnusbaeck](#):
>
> add\_field =\> {  
> "fieldname" =\> "fieldvalue"  
> }

thanks

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 6, 2017, 5:12am UTC](https://discuss.elastic.co/t/add-a-field/41378/4 "2017-07-06T05:12:14Z")

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