# Does it possible remove all nested fields except white-list?
**URL:** https://discuss.elastic.co/t/does-it-possible-remove-all-nested-fields-except-white-list/46417
**Category:** Logstash
**Created:** [April 5, 2016, 3:12pm UTC](https://discuss.elastic.co/t/does-it-possible-remove-all-nested-fields-except-white-list/46417 "2016-04-05T15:12:23Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Alexander\_Popov](https://discuss.elastic.co/u/Alexander_Popov)
#### Post date: [April 5, 2016, 3:12pm UTC](https://discuss.elastic.co/t/does-it-possible-remove-all-nested-fields-except-white-list/46417/1 "2016-04-05T15:12:23Z")
source:
{
"message":"aaa"
"req":{
"url":"..."
......
},
"string1":"value",,
"stringN":"value"
"int1":1,
"intN":1,
"object1":{},
"objectN":{},
}
1. Can I remove fields of type "object" except some whitelist? (remove object1...objectN? but leave req)
2.does it possible to use type of i conditions? like
if typeof [somefield] == "object" {
drop{}
}
---
### Author:  [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)
#### Post date: [April 5, 2016, 5:14pm UTC](https://discuss.elastic.co/t/does-it-possible-remove-all-nested-fields-except-white-list/46417/2 "2016-04-05T17:14:19Z")
The prune filter allows removal of fields by name and by value but not by type so you probably can't use it here, but it's actually a reasonable feature request. I've filed [logstash-filter-prune #6](https://github.com/logstash-plugins/logstash-filter-prune/issues/6) for this. Until that's implemented you'd have to use a ruby filter.
---
### Author:  [@Alexander\_Popov](https://discuss.elastic.co/u/Alexander_Popov)
#### Post date: [April 5, 2016, 5:46pm UTC](https://discuss.elastic.co/t/does-it-possible-remove-all-nested-fields-except-white-list/46417/3 "2016-04-05T17:46:02Z")
Does prune now supports nested fields?
with source
{
"obj": {
"0": "...",
"1": "...",
"2": "...",
"11": "...",
"stack": "asdasdasd"
}
}
I'm trying to prune 0...11 subfields :
prune {
blacklist\_names =\> ["err.\d+"]
}
but its not work
---
### Author:  [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)
#### Post date: [April 5, 2016, 5:55pm UTC](https://discuss.elastic.co/t/does-it-possible-remove-all-nested-fields-except-white-list/46417/4 "2016-04-05T17:55:11Z")
It probably doesn't support nested fields, but if it does I would expect it to use the nested field syntax (see [https://www.elastic.co/guide/en/logstash/current/event-dependent-configuration.html#logstash-config-field-references](https://www.elastic.co/guide/en/logstash/current/event-dependent-configuration.html#logstash-config-field-references)).
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 5:03am UTC](https://discuss.elastic.co/t/does-it-possible-remove-all-nested-fields-except-white-list/46417/5 "2017-07-06T05:03:46Z")