# How to output a specific fields of JSON data in logstash

**URL:** <https://discuss.elastic.co/t/how-to-output-a-specific-fields-of-json-data-in-logstash/279944>\
**Category:** Logstash\
**Created:** [July 29, 2021, 7:28am UTC](https://discuss.elastic.co/t/how-to-output-a-specific-fields-of-json-data-in-logstash/279944 "2021-07-29T07:28:45Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Takky](https://avatars.discourse-cdn.com/v4/letter/t/a4c791/32.png) [@Takky](https://discuss.elastic.co/u/Takky)\
**Post date:** [July 29, 2021, 7:28am UTC](https://discuss.elastic.co/t/how-to-output-a-specific-fields-of-json-data-in-logstash/279944/1 "2021-07-29T07:28:45Z")

</div>

I want to know how to select and output some fields from JSON data with many fields.  
For example, there is the following input JSON data.

```auto
[input]
{
    "layers1": {
      "field01": {
        "sample01": "5",
        "sample02": "abc",
        "sample03": "xxxxxxxx",
        "sample04": "name001"
      },
      "field02": {
        "sample01": "5",
        "sample02": "abc",
        "sample03": "xxxxxxxx",
        "sample04": "name002"
      }
    },
    "layers2": {
      "field01": {
        "sample01": "5",
        "sample02": "abc",
        "sample03": "xxxxxxxx",
        "sample04": "name003"
      },
      "field02": {
        "sample01": "5",
        "sample02": "abc",
        "sample03": "xxxxxxxx",
        "sample04": "name004"
      }
    }
}

```

I want to output only each "sample04" field in the output data.

```auto
[output]
{
    "layers1": {
      "field01": {
        "sample04": "name001"
      },
      "field02": {
        "sample04": "name002"
      }
    },
    "layers2": {
      "field01": {
        "sample04": "name003"
      },
      "field02": {
        "sample04": "name004"
      }
    }
}

```

How should I set it in the logstash config file?

---

<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:** [August 26, 2021, 7:29am UTC](https://discuss.elastic.co/t/how-to-output-a-specific-fields-of-json-data-in-logstash/279944/2 "2021-08-26T07:29:37Z")

</div>

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