# Concatenate / join values of tags into one field

**URL:** https://discuss.elastic.co/t/concatenate-join-values-of-tags-into-one-field/300606
**Category:** Logstash
**Created:** [March 24, 2022, 4:19pm UTC](https://discuss.elastic.co/t/concatenate-join-values-of-tags-into-one-field/300606 "2022-03-24T16:19:47Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![S-elk](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/s-elk/32/98464_2.png) [@S-elk](https://discuss.elastic.co/u/S-elk)
#### Post date: [March 24, 2022, 4:19pm UTC](https://discuss.elastic.co/t/concatenate-join-values-of-tags-into-one-field/300606/1 "2022-03-24T16:19:47Z")

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hello!

i want to join all the tags field values into one new field?

can i do that with join mutate filter ?

if not, how can i do that ?

example :

tags = ["1","2","3"]  
new\_field = "123"

thanks in advanced!

p.d. is my first post. if i did something wrong im sorry.

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<div class="post-metadata">

### Author: ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)
#### Post date: [March 24, 2022, 4:51pm UTC](https://discuss.elastic.co/t/concatenate-join-values-of-tags-into-one-field/300606/2 "2022-03-24T16:51:32Z")

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I would do that in ruby

```
    ruby {
        code => '
            tags = event.get("tags")
            if tags.is_a? Array
                event.set("newfield", tags.join)
            end
        '
    }
```

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<div class="post-metadata">

### Author: ![S-elk](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/s-elk/32/98464_2.png) [@S-elk](https://discuss.elastic.co/u/S-elk)
#### Post date: [March 25, 2022, 10:29am UTC](https://discuss.elastic.co/t/concatenate-join-values-of-tags-into-one-field/300606/3 "2022-03-25T10:29:01Z")

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Wow thank you so much!! thanks for the speed of response!

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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: [April 22, 2022, 10:29am UTC](https://discuss.elastic.co/t/concatenate-join-values-of-tags-into-one-field/300606/4 "2022-04-22T10:29:47Z")

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