# Csv output plugin - custom field
**URL:** https://discuss.elastic.co/t/csv-output-plugin-custom-field/118744
**Category:** Logstash
**Created:** [February 7, 2018, 3:46am UTC](https://discuss.elastic.co/t/csv-output-plugin-custom-field/118744 "2018-02-07T03:46:07Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@alexus](https://discuss.elastic.co/u/alexus)
#### Post date: [February 7, 2018, 3:46am UTC](https://discuss.elastic.co/t/csv-output-plugin-custom-field/118744/1 "2018-02-07T03:46:07Z")
I'm following [Csv output plugin | Logstash Reference [6.1] | Elastic](https://www.elastic.co/guide/en/logstash/current/plugins-outputs-csv.html#plugins-outputs-csv-fields) and I have a question...
How would I add extra field with my own text?
Please advise.
---
### Author:  [@Krunal\_kalaria](https://discuss.elastic.co/u/Krunal_kalaria)
#### Post date: [February 7, 2018, 6:09am UTC](https://discuss.elastic.co/t/csv-output-plugin-custom-field/118744/2 "2018-02-07T06:09:32Z")
hi @alexus,
[https://www.elastic.co/guide/en/logstash/current/plugins-filters-mutate.html#plugins-filters-mutate-add\_field](https://www.elastic.co/guide/en/logstash/current/plugins-filters-mutate.html#plugins-filters-mutate-add_field)
[https://www.elastic.co/guide/en/logstash/current/plugins-filters-kv.html](https://www.elastic.co/guide/en/logstash/current/plugins-filters-kv.html)
You can use mutate or kv plugin in filter to add field.
Thanks & Regard,
Krunal.
---
### Author:  [@alexus](https://discuss.elastic.co/u/alexus)
#### Post date: [February 8, 2018, 3:50am UTC](https://discuss.elastic.co/t/csv-output-plugin-custom-field/118744/3 "2018-02-08T03:50:01Z")
I've tried adding following:
```
filter {
mutate {
add_field => { "key" => "value" }
}
}
```
yet file came out without new column "key" with "value" in every row...
---
### Author:  [@Krunal\_kalaria](https://discuss.elastic.co/u/Krunal_kalaria)
#### Post date: [February 8, 2018, 4:48am UTC](https://discuss.elastic.co/t/csv-output-plugin-custom-field/118744/4 "2018-02-08T04:48:50Z")
i have been try this to add extra field and its working fine:
filter
{
mutate
{
add\_field =\> ["Local\_ip", "%{[Local][2]}"]
}
}
---
### Author:  [@alexus](https://discuss.elastic.co/u/alexus)
#### Post date: [February 8, 2018, 8:51pm UTC](https://discuss.elastic.co/t/csv-output-plugin-custom-field/118744/5 "2018-02-08T20:51:06Z")
hmm, your example looks similar to mine, except for in mine (per Logstash's reference example), I used curly brackets and you use square brackets...
Did you had to adjust output somehow to reflect new field in output file somehow? maybe that's the part I'm missing somehow?
---
### Author:  [@alexus](https://discuss.elastic.co/u/alexus)
#### Post date: [February 8, 2018, 9:01pm UTC](https://discuss.elastic.co/t/csv-output-plugin-custom-field/118744/6 "2018-02-08T21:01:00Z")
ahh, I was right... I added in output csv fields added my new field and now it's working as expected)
---
### Author:  [@Krunal\_kalaria](https://discuss.elastic.co/u/Krunal_kalaria)
#### Post date: [February 9, 2018, 4:14am UTC](https://discuss.elastic.co/t/csv-output-plugin-custom-field/118744/7 "2018-02-09T04:14:26Z")
Great 🙂
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [March 9, 2018, 4:14am UTC](https://discuss.elastic.co/t/csv-output-plugin-custom-field/118744/8 "2018-03-09T04:14:41Z")
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