# stdout

The `filter_stdout` filter plugin prints events to the standard output (or logs if launched as a daemon). This filter plugin is useful for debugging purposes.

It is included in the Fluentd's core.

## Example Configurations

```
<filter pattern>
  @type stdout
</filter>
```

A sample output is as follows:

```
2017-11-28 11:43:13.814351757 +0900 tag: {"field1":"value1","field2":"value2"}
```

where the first part shows the output **time**, the second part shows the **tag**, and the third part shows the **record**.

## Plugin Helpers

* [`formatter`](/plugin-helper-overview/api-plugin-helper-formatter.md)
* [`compat_parameters`](/plugin-helper-overview/api-plugin-helper-compat_parameters.md)
* [`inject`](/plugin-helper-overview/api-plugin-helper-inject.md)

## Parameters

See [Common Parameters](/configuration/plugin-common-parameters.md).

### `@type` (required)

The value must be `stdout`.

### `<format>` Section

See [Format section configurations](/configuration/format-section.md) for more details.

#### `@type`

| type   | default | version |
| ------ | ------- | ------- |
| string | stdout  | 0.14.5  |

The format of the output.

#### `output_type`

| type   | default | version |
| ------ | ------- | ------- |
| string | json    | 0.14.5  |

This is the option of `stdout` format. Configures the format of the record (third part). Any formatter plugins can be specified.

### `<inject>` Section

See [Inject Section Configurations](/configuration/inject-section.md) for more details.

## Learn More

* [Filter Plugin Overview](/filter.md)

If this article is incorrect or outdated, or omits critical information, please [let us know](https://github.com/fluent/fluentd-docs-gitbook/issues?state=open). [Fluentd](http://www.fluentd.org/) is an open-source project under [Cloud Native Computing Foundation (CNCF)](https://cncf.io/). All components are available under the Apache 2 License.


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.fluentd.org/filter/stdout.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.