# How to apply json filter to every field that ends with "json"?
**URL:** https://discuss.elastic.co/t/how-to-apply-json-filter-to-every-field-that-ends-with-json/221652
**Category:** Logstash
**Created:** [March 2, 2020, 9:22am UTC](https://discuss.elastic.co/t/how-to-apply-json-filter-to-every-field-that-ends-with-json/221652 "2020-03-02T09:22:05Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@sahar](https://discuss.elastic.co/u/sahar)
#### Post date: [March 2, 2020, 9:22am UTC](https://discuss.elastic.co/t/how-to-apply-json-filter-to-every-field-that-ends-with-json/221652/1 "2020-03-02T09:22:05Z")
Hello,
I'm extracting fields from the message using KV filter, some of these fields might be holding a json value - I would like to iterate all fields and check if the field key ends with "json", to apply json filter on the value.
How can I achieve that?
Thanks for the help.
---
### Author:  [@Badger](https://discuss.elastic.co/u/Badger)
#### Post date: [March 2, 2020, 2:44pm UTC](https://discuss.elastic.co/t/how-to-apply-json-filter-to-every-field-that-ends-with-json/221652/2 "2020-03-02T14:44:54Z")
I think you would have to write code to do that in a ruby filter.
---
### Author:  [@sahar](https://discuss.elastic.co/u/sahar)
#### Post date: [March 3, 2020, 8:16pm UTC](https://discuss.elastic.co/t/how-to-apply-json-filter-to-every-field-that-ends-with-json/221652/3 "2020-03-03T20:16:52Z")
Indeed achieved this using ruby filter:
```
ruby {
code => '
event.to_hash.each do |k,v|
if k.end_with?("json")
event.set(k, JSON.parse(v))
end
end
'
}
```
Thanks for the help.
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [March 31, 2020, 8:17pm UTC](https://discuss.elastic.co/t/how-to-apply-json-filter-to-every-field-that-ends-with-json/221652/4 "2020-03-31T20:17:08Z")
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