Config: Format Section

Some of Fluentd's plugins support the <format> section to specify how to format record.

Format section overview

Format section can be in <match> or <filter> sections.

<match tag.*>
@type file
# parameters for output plugin
# format section parameters

formatter plugin type

<format> section requires @type parameter to specify the type of formatter plugin. Fluentd core bundles some useful formatter plugins. 3rd party plugins are also available when installed.

@type json

These are the list of built-in formatter plugins.

For more details, see plugins documentation.



@type key is to specify the type of formatter plugin.

@type csv
# ...

Time parameters

  • time_type (enum) (optional): parse/format value according to

    this type

    • Default: float

    • Available values: float, unixtime, string

      • float: seconds from Epoch + nano seconds (e.g. 1510544836.154709804)

      • unixtime: seconds from Epoch (e.g. 1510544815)

      • string: use format specified by time_format, local time or time zone

  • time_format (string) (optional): process value using specified format. This is available only when time_type is string

    • Default: nil

    • Available time format:

      • For more details about formatting, see Time#strftime

      • For more details about parsing, see Time.strptime

      • %iso8601 (only for parsing)

      • Use %N to parse/format subsecond, because strptime does not support %3N, %6N, %9N, and %L

  • localtime (bool) (optional): if true, use local time. Otherwise, UTC is used. This is exclusive with utc.

    • Default: true

  • utc (bool) (optional): if true, use UTC. Otherwise, local time is used. This is exclusive with localtime.

    • Default: false

  • timezone (string) (optional): use specified timezone. one can parse/format the time value in the specified timezone.

    • Default: nil

    • Available time zone format:

      1. [+-]HH:MM (e.g. "+09:00") (recommended)

      2. [+-]HHMM (e.g. "+0900")

      3. [+-]HH (e.g. "+09")

      4. Region/Zone (e.g. "Asia/Tokyo")

      5. Region/Zone/Zone (e.g. "America/Argentina/Buenos_Aires")

If this article is incorrect or outdated, or omits critical information, please let us know. Fluentd is a open source project under Cloud Native Computing Foundation (CNCF). All components are available under the Apache 2 License.