# Remove a pattern from json nested fields
**URL:** https://discuss.elastic.co/t/remove-a-pattern-from-json-nested-fields/254542
**Category:** Logstash
**Created:** [November 6, 2020, 3:08pm UTC](https://discuss.elastic.co/t/remove-a-pattern-from-json-nested-fields/254542 "2020-11-06T15:08:23Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@nilubkal](https://discuss.elastic.co/u/nilubkal)
#### Post date: [November 6, 2020, 3:08pm UTC](https://discuss.elastic.co/t/remove-a-pattern-from-json-nested-fields/254542/1 "2020-11-06T15:08:23Z")
Hey guys,
i have the following json structure which i would like to rename from :
```auto
json.detail.info.processed_event.instance_id
json.detail.info.processed_event.invalidations.metadata
json.detail.info.processed_event.invalidations.remote_schemas
json.detail.info.processed_event.occurred_at
```
to
```auto
json.processed_event.instance_id
json.processed_event.invalidations.metadata
json.processed_event.invalidations.remote_schemas
json.processed_event.occurred_at
```
by removing _[detailed][info]_ . Is it achievable without using a ruby script ?
Thanks !
---
### Author:  [@Badger](https://discuss.elastic.co/u/Badger)
#### Post date: [November 6, 2020, 3:42pm UTC](https://discuss.elastic.co/t/remove-a-pattern-from-json-nested-fields/254542/2 "2020-11-06T15:42:57Z")
If you have a fixed list of fields you could do it using mutate+rename. If you want to iterate over every field without knowing what they are called in advance then you will have to use ruby.
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [December 4, 2020, 3:43pm UTC](https://discuss.elastic.co/t/remove-a-pattern-from-json-nested-fields/254542/3 "2020-12-04T15:43:02Z")
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