# How to select specific field value

**URL:** <https://discuss.elastic.co/t/how-to-select-specific-field-value/197473>\
**Category:** Logstash\
**Created:** [August 30, 2019, 8:42am UTC](https://discuss.elastic.co/t/how-to-select-specific-field-value/197473 "2019-08-30T08:42:10Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Skiloop\_Shi](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/skiloop_shi/32/53352_2.png) [@Skiloop\_Shi](https://discuss.elastic.co/u/Skiloop_Shi)\
**Post date:** [August 30, 2019, 8:42am UTC](https://discuss.elastic.co/t/how-to-select-specific-field-value/197473/1 "2019-08-30T08:42:10Z")

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For example:

How to turn

{"name":"James","location":{"city":"A City","address":""}}

into

{"city":"A City","address":""}

---

<div class="post-metadata">

**Author:** ![serdar1](https://avatars.discourse-cdn.com/v4/letter/s/6de8d8/32.png) [@serdar1](https://discuss.elastic.co/u/serdar1)\
**Post date:** [August 30, 2019, 9:06am UTC](https://discuss.elastic.co/t/how-to-select-specific-field-value/197473/2 "2019-08-30T09:06:23Z")

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Hi,

Maybe with this :

mutate {  
copy =\> { "[location]" =\> "my\_new\_field" }  
}

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<div class="post-metadata">

**Author:** ![humartinez](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/humartinez/32/46395_2.png) [@humartinez](https://discuss.elastic.co/u/humartinez)\
**Post date:** [August 30, 2019, 12:49pm UTC](https://discuss.elastic.co/t/how-to-select-specific-field-value/197473/3 "2019-08-30T12:49:52Z")

</div>

Also you could try the mutate/split filter,

mutate {  
split =\> ["message",","]  
add\_field =\> { "city" =\> "%{[message][1]}"}  
}

Regards

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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:** [September 27, 2019, 12:49pm UTC](https://discuss.elastic.co/t/how-to-select-specific-field-value/197473/4 "2019-09-27T12:49:53Z")

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