# Assign default value to a field if no value is present

**URL:** <https://discuss.elastic.co/t/assign-default-value-to-a-field-if-no-value-is-present/135753>\
**Category:** Logstash\
**Created:** [June 13, 2018, 3:05pm UTC](https://discuss.elastic.co/t/assign-default-value-to-a-field-if-no-value-is-present/135753 "2018-06-13T15:05:50Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Hanciv](https://avatars.discourse-cdn.com/v4/letter/h/ea666f/32.png) [@Hanciv](https://discuss.elastic.co/u/Hanciv)\
**Post date:** [June 13, 2018, 3:05pm UTC](https://discuss.elastic.co/t/assign-default-value-to-a-field-if-no-value-is-present/135753/1 "2018-06-13T15:05:50Z")

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Hi,  
I am reading a log message with KV pairs in logstash and sending them over to Elastic Search. If some of the fields dont have value, i want to assing a default value like "N/A" instead of sending them as "%FIELD\_NAME".

For eg., I am constructing a JSON in logstash like below. if "environment" is not present in the input message, i need to assign default value

"[application][environment]" =\> "%{environment}"

Thanks for your help!!

---

<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:** [June 13, 2018, 3:35pm UTC](https://discuss.elastic.co/t/assign-default-value-to-a-field-if-no-value-is-present/135753/2 "2018-06-13T15:35:06Z")

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```
if [environment] {
    mutate { add_field => { "[application][environment]" => "%{environment}" } }
} else {
    mutate { add_field => { "[application][environment]" => "N/A" } }
}
```

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<div class="post-metadata">

**Author:** ![Hanciv](https://avatars.discourse-cdn.com/v4/letter/h/ea666f/32.png) [@Hanciv](https://discuss.elastic.co/u/Hanciv)\
**Post date:** [June 13, 2018, 4:47pm UTC](https://discuss.elastic.co/t/assign-default-value-to-a-field-if-no-value-is-present/135753/3 "2018-06-13T16:47:52Z")

</div>

Thanks, that worked !!

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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 11, 2018, 4:48pm UTC](https://discuss.elastic.co/t/assign-default-value-to-a-field-if-no-value-is-present/135753/4 "2018-07-11T16:48:00Z")

</div>

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