# Renaming dynamic nested json message fields
**URL:** https://discuss.elastic.co/t/renaming-dynamic-nested-json-message-fields/75799
**Category:** Logstash
**Created:** [February 20, 2017, 10:27pm UTC](https://discuss.elastic.co/t/renaming-dynamic-nested-json-message-fields/75799 "2017-02-20T22:27:08Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@pbData](https://discuss.elastic.co/u/pbData)
#### Post date: [February 20, 2017, 10:27pm UTC](https://discuss.elastic.co/t/renaming-dynamic-nested-json-message-fields/75799/1 "2017-02-20T22:27:08Z")
I have the following json data
{
"parent" : {
" **child\_1**" : {
"field\_1":123,
"field\_2":" **my\_child\_1\_string**"
},
" **child\_2**" : {
"field\_1":456,
"field\_2":" **my\_child\_2\_string**"
}
}
}
I need to be able to find all fields that are under a parent and rename that child with a field under the child. For example for the above it should look like
{
"parent" : {
" **my\_child\_1\_string**" : {
"field\_1":123,
"field\_2":" **my\_child\_1\_string**"
},
" **my\_child\_2\_string**" : {
"field\_1":456,
"field\_2":" **my\_child\_2\_string**"
}
}
}
I think I need to possibly use a mutate filter for this or maybe something else. Not sure.
Hope you can help out.
---
### Author:  [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)
#### Post date: [February 23, 2017, 6:39am UTC](https://discuss.elastic.co/t/renaming-dynamic-nested-json-message-fields/75799/2 "2017-02-23T06:39:24Z")
The mutate filter won't be enough. You'll have to write a snippet of Ruby code in a ruby filter. I'm afraid I don't have an example of exactly what you need.
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [March 23, 2017, 6:39am UTC](https://discuss.elastic.co/t/renaming-dynamic-nested-json-message-fields/75799/3 "2017-03-23T06:39:29Z")
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