# ltsv

The `ltsv` parser plugin parses [LTSV](http://ltsv.org/) format.

## Parameters

See [Parse Section Configurations](/configuration/parse-section.md).

### `delimiter`

| type   | default | version |
| ------ | ------- | ------- |
| string | `\t`    | 0.14.0  |

The delimiter (character or string) separating LTSV values.

### `delimiter_pattern`

| type   | default | version |
| ------ | ------- | ------- |
| regexp | nil     | 1.2.0   |

The delimiter pattern of TSV values. This parameter overwrites `delimiter` parameter if specified.

`delimiter_pattern` is string type before 1.2.0.

### `label_delimiter`

| type   | default | version |
| ------ | ------- | ------- |
| string | :       | 0.14.0  |

The delimiter character between field name and value.

## Example for LTSV

This incoming event:

```
time:2013/02/28 12:00:00\thost:192.168.0.1\treq_id:111\tuser:-
```

is parsed as:

```
time:
1362020400 (2013/02/28/ 12:00:00)

record:
{
  "host"   : "192.168.0.1",
  "req_id" : "111",
  "user"   : "-"
}
```

If you set `null_value_pattern '-'` in the configuration, `user` field becomes `nil` instead of `"-"`.

## Example with `delimiter_pattern`

With this configuration:

```
<parse>
  @type ltsv
  delimiter_pattern /\s+/
  label_delimiter =
</parse>
```

This incoming event:

```
timestamp=1362020400 host=192.168.0.1  req_id=111 user=-
```

is parsed as:

```
record:
{
  "timestamp": "1362020400",
  "host"     : "192.168.0.1",
  "req_id"   : "111",
  "user"     : "-"
}
```

If this article is incorrect or outdated, or omits critical information, please [let us know](https://github.com/fluent/fluentd-docs-gitbook/issues?state=open).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.


---

# 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/parser/ltsv.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.