# Question on kv filter

**URL:** <https://discuss.elastic.co/t/question-on-kv-filter/322388>\
**Category:** Logstash\
**Created:** [January 3, 2023, 2:58pm UTC](https://discuss.elastic.co/t/question-on-kv-filter/322388 "2023-01-03T14:58:59Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![moberreiter](https://avatars.discourse-cdn.com/v4/letter/m/439d5e/32.png) [@moberreiter](https://discuss.elastic.co/u/moberreiter)\
**Post date:** [January 3, 2023, 2:58pm UTC](https://discuss.elastic.co/t/question-on-kv-filter/322388/1 "2023-01-03T14:58:59Z")

</div>

Hello everyone!

I have a log from syslog which logstash should parse:

Source:

`Jan 3 10:14:40 123.123.123.123 {"zone_src":"SRC","zone_dst":"DST","reason":"rule","rule_id":12345,"rule_description":"Rule Description","action":"ACCEPT","@timestamp":"2023-01-03T10:14:39.151179+0100","timestamp":1672737279,"timestamp_usec":151179,"iface_in":"123456","iface_out":"asdf1.123","ip_src":"100.100.100.100","ip_dst":"200.200.200.200","protocol":6,"port_src":12345,"port_dst":1234,"mark":352321536,"tos":0,"host_id":123456,"host_name":"hostname123,"logtype":"forward"}`

Now I want kv to split the keys and values within the curly brackets and exclude the date and IP Address before the curly brackets.

I tried it with the following config but it won't work:

```auto
input {
 file {
   path => ["/var/log/syslog-test4"]
   sincedb_path => "/dev/null"
   start_position => "beginning"
      }
}
filter {
 dissect {
   mapping => {
"message" => "\"%{month1} %{day2} %{time3} %{host4} {\"zone_src\":\"%{zone_src}\",\"zone_dst\":\"%{zone_dst}\",\"reason\":\"%{reason}\",\"rule_id\":%{rule_id},\"rule_description\":\"%{rule_description}\",\"action\":\"%{action}\",\"@timestamp\":\"%{@timestamp}\",\"timestamp\":%{timestamp},\"timestamp_usec\":%{timestamp_usec},\"iface_in\":\"%{iface_in}\",\"iface_out\":\"%{iface_out}\",\"ip_src\":\"%{ip_src}\",\"ip_dst\":\"%{ip_dst}\",\"protocol\":%{protocol},\"port_src\":%{port_src},\"port_dst\":%{port_dst},\"mark\":%{mark},\"tos\":%{tos},\"host_id\":%{host_id},\"host_name\":\"%{host_name}\",\"logtype\":\"%{logtype}\"}\""

}
   remove_field => ["month1" , "day2" , "time3" , "host4"]
  }

        kv {
           source => "message"
           field_split => ","
           value_split => ":"
           trim_key => "{\\\""
           trim_value => "\\\"}"
           #target_field => "details"
           include_brackets => false
    }
}

```

Can anyone of you assist on how I could achieve this?

Thank you,

Max

---

<div class="post-metadata">

**Author:** ![leandrojmp](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/leandrojmp/32/107231_2.png) [@leandrojmp](https://discuss.elastic.co/u/leandrojmp)\
**Post date:** [January 3, 2023, 3:09pm UTC](https://discuss.elastic.co/t/question-on-kv-filter/322388/2 "2023-01-03T15:09:05Z")

</div>

That part of your log is not a KV, it is a JSON, you should use the json filter.

Change your dissect to this:

```auto
dissect {
    mapping => {
        "message" => "%{month1} %{day2} %{time3} %{%host4} %{jsonMessage}"
    }
}

```

Then use a json filter with the `jsonMessage` field.

```auto
json {
    source => "jsonMessage"
}

```

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [January 31, 2023, 3:09pm UTC](https://discuss.elastic.co/t/question-on-kv-filter/322388/3 "2023-01-31T15:09:22Z")

</div>

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