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Config: Format Section

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

Format Section Overview

The format section can be under <match> or <filter> section.
<match tag.*>
@type file
# ...
# ...

Formatter Plugin Type

The @type parameter of <format> section specifies the type of the formatter plugin. Fluentd core bundles some useful formatter plugins.
@type json
Here's the list of built-in formatter plugins:
Third-party plugins may also be installed and configured.
For more details, see plugins documentation.



The @type parameter specifies the type of the formatter plugin.
@type csv
# ...

Time Parameters

  • time_type (enum) (optional): parses/formats value according to this
    • Default: float
    • Available values: float, unixtime, string
      • float: seconds from Epoch + nano seconds (e.g.
      • unixtime: seconds from Epoch (e.g. 1510544815)
      • string: use format specified by time_format, local time or time
  • time_format (string) (optional): processes value according to the
    specified format. This is available only when time_type is string.
    • Default: nil
    • Available time format:
      • For more details about formatting, see
      • For more details about parsing, see
      • %iso8601 (only for parsing)
      • Use %N to parse/format with sub-second precision, because
        strptime does not support
        %3N, %6N, %9N, and %L.
  • localtime (bool) (optional): if true, uses local time. Otherwise,
    UTC is used. This is exclusive with utc.
    • Default: true
  • utc (bool) (optional): if true, uses UTC. Otherwise, local time is
    used. This is exclusive with localtime.
    • Default: false
  • timezone (string) (optional): uses the specified timezone. One can
    parse/format the time value in the specified timezone format.
    • Default: nil
    • Available time zone format:
      1. 1.
        [+-]HH:MM (e.g. "+09:00") (recommended)
      2. 2.
        [+-]HHMM (e.g. "+0900")
      3. 3.
        [+-]HH (e.g. "+09")
      4. 4.
        Region/Zone (e.g. Asia/Tokyo)
      5. 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If this article is incorrect or outdated, or omits critical information, please let us know.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 an open-source project under Cloud Native Computing Foundation (CNCF). All components are available under the Apache 2 License.