# Handle null values in json

**URL:** <https://discuss.elastic.co/t/handle-null-values-in-json/153774>\
**Category:** Logstash\
**Created:** [October 24, 2018, 11:03am UTC](https://discuss.elastic.co/t/handle-null-values-in-json/153774 "2018-10-24T11:03:19Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![prem\_kumar](https://avatars.discourse-cdn.com/v4/letter/p/ecccb3/32.png) [@prem\_kumar](https://discuss.elastic.co/u/prem_kumar)\
**Post date:** [October 24, 2018, 11:03am UTC](https://discuss.elastic.co/t/handle-null-values-in-json/153774/1 "2018-10-24T11:03:19Z")

</div>

I have a JSON line this  
`{ "name": "prem", "level": null }`

My Logstash configuration looks like this

filter {  
grok {  
match =\> {{TIMESTAMP\_ISO8601:timestamp} %{GREEDYDATA:logD}" }  
}  
json{  
source =\> "logD"  
target =\> "logMsg"

```
	add_field => {
      "nameField" => "%{[logMsg][name]}"
      "levelField" => "%{[logMsg][level]}"

}
remove_field => ["logD"]
}

```

}

When the above log was processed I am getting '%{[logMsg][level]}' value in levelField.  
How to set 'levelField' to null.

---

<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:** [November 21, 2018, 11:03am UTC](https://discuss.elastic.co/t/handle-null-values-in-json/153774/2 "2018-11-21T11:03:24Z")

</div>

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