# Logstash not able to get nested json in desired output using ruby
**URL:** https://discuss.elastic.co/t/logstash-not-able-to-get-nested-json-in-desired-output-using-ruby/363751
**Category:** Logstash
**Created:** [July 25, 2024, 2:23am UTC](https://discuss.elastic.co/t/logstash-not-able-to-get-nested-json-in-desired-output-using-ruby/363751 "2024-07-25T02:23:33Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Bhanu\_Praveen](https://discuss.elastic.co/u/Bhanu_Praveen)
#### Post date: [July 25, 2024, 2:23am UTC](https://discuss.elastic.co/t/logstash-not-able-to-get-nested-json-in-desired-output-using-ruby/363751/1 "2024-07-25T02:23:33Z")
Below is my sample output log
```auto
{
"traceId": "o0uyveRU/8BkjL+lbpDlnQ==",
"spanId": "73rmqIRmo34=",
"tags": [
{
"key": "otel.library.name",
"vStr": "com.mdi.core.workmgmt.TypedConsumer"
},
{
"key": "ta.work.receivedTime",
"vType": "INT64",
"vInt64": "1721628429423"
},
{
"key": "internal.span.format",
"vStr": "otlp"
}
],
"process": {
"serviceName": "TRADE_SINGLETON",
"tags": [
{
"key": "deployment.environment",
"vStr": "PSR"
},
{
"key": "telemetry.sdk.version",
"vStr": "1.34.0"
}
]
}
}
```
Need output as below:
```auto
{
"traceId": "o0uyveRU/8BkjL+lbpDlnQ==",
"spanId": "73rmqIRmo34=",
"tags.otel.library.name":"com.mdi.core.workmgmt.TypedConsumer",
"tags.ta.work.receivedTime":"1721628429423",
"tags.internal.span.format":"otlp",
"process.serviceName":"TRADE_SINGLETON",
"process.tags.deployment.environment":"PSR",
"process.tags.telemetry.sdk.version":"1.34.0"
}
```
Below logstash config i have tried to get first [tags] section fields, but no fields getting added:
```auto
filter
{
json
{
source => "message"
target => "tmessage"
}
ruby {
code => '
event.get("[tmessage][tags]").each { |a|
name = a["Name"]
value = a["Value"]
event.set( "[tmessage][#{name}]", value)
}
'
}
}
```
Kindly let me know the solution?
---
### Author:  [@Badger](https://discuss.elastic.co/u/Badger)
#### Post date: [July 25, 2024, 3:08am UTC](https://discuss.elastic.co/t/logstash-not-able-to-get-nested-json-in-desired-output-using-ruby/363751/2 "2024-07-25T03:08:11Z")
> [@Bhanu\_Praveen](#):
>
> ```auto
> name = a["Name"]
> value = a["Value"]
>
> ```
Your tags do not have a "Name" and "Value", they have a "key" and another hash entry, the name of which depends on "vType", which may not be present. So you could change those two lines to
```
name = a["key"]
value = a["vStr"]
```
but that will not work for "vType": "INT64" (or any type other than string). You may also need to add type conversion to make ints ints, booleans booleans, etc. That said, the two line change above will get you
```
"otel.library.name" => "com.mdi.core.workmgmt.TypedConsumer",
"ta.work.receivedTime" => nil,
"internal.span.format" => "otlp"
```
which is a step towards what you want.
---
### Author:  [@Bhanu\_Praveen](https://discuss.elastic.co/u/Bhanu_Praveen)
#### Post date: [July 25, 2024, 6:15am UTC](https://discuss.elastic.co/t/logstash-not-able-to-get-nested-json-in-desired-output-using-ruby/363751/3 "2024-07-25T06:15:33Z")
Thanks for the response, after changing the values, facing below ruby exception. pls let me know where would be the issue?
Updated Filter:
```auto
filter
{
json
{
source => "message"
target => "tmessage"
}
ruby {
code => '
event.get("[message][tags]").each { |a|
name = a["key"]
value = a["vStr"]
event.set( "[message][tagsFattened]#{name}", value)
}
'
}
}
```
Below error
```auto
[2024-07-25T01:17:48,516][ERROR][logstash.filters.ruby][main][e6fe0e97cf931545d8bb7438d328202eacfe609144d4e9a0f02c03d25d306cfb] Ruby exception occurred: undefined method `each' for nil:NilClass {:class=>"NoMethodError", :backtrace=>["(ruby filter code):3:in `block in register'", "/usr/share/logstash/vendor/bundle/jruby/3.1.0/gems/logstash-filter-ruby-3.1.8/lib/logstash/filters/ruby.rb:96:in `inline_script'", "/usr/share/logstash/vendor/bundle/jruby/3.1.0/gems/logstash-filter-ruby-3.1.8/lib/logstash/filters/ruby.rb:89:in `filter'", "/usr/share/logstash/logstash-core/lib/logstash/filters/base.rb:158:in `do_filter'", "/usr/share/logstash/logstash-core/lib/logstash/filters/base.rb:176:in `block in multi_filter'", "org/jruby/RubyArray.java:1989:in `each'", "/usr/share/logstash/logstash-core/lib/logstash/filters/base.rb:173:in `multi_filter'", "org/logstash/config/ir/compiler/AbstractFilterDelegatorExt.java:133:in `multi_filter'", "/usr/share/logstash/logstash-core/lib/logstash/java_pipeline.rb:304:in `block in start_workers'"]}
```
---
### Author:  [@Bhanu\_Praveen](https://discuss.elastic.co/u/Bhanu_Praveen)
#### Post date: [July 25, 2024, 10:55am UTC](https://discuss.elastic.co/t/logstash-not-able-to-get-nested-json-in-desired-output-using-ruby/363751/4 "2024-07-25T10:55:25Z")
Able to get it work, issue with event.set statement
`event.set( name, value)`
Thanks Badger