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Filename extension.toml
Internet media typenot registered
Developed byTom Preston-Werner
Initial release23 February 2013; 6 years ago (2013-02-23)
Latest release
(July 10, 2018; 7 months ago (2018-07-10))
Type of formatData interchange
Open format?Yes

TOML is a configuration file format that is intended to be easy to read due to more obvious semantics which aims to be "minimal". TOML is designed to map unambiguously to a dictionary.

"TOML", the name, is an acronym for "Tom's Obvious, Minimal Language"[1] referring to its creator: Tom Preston-Werner.

TOML is used in a number of software projects [2] and is implemented in a large number of programming languages,[3][4].

TOML is inspired by .INI file syntax, but with a more formal specification.[5]


TOML's syntax largely consists of key = "value" pairs, [section names], and # comments.

It specifies a list of supported data types: String, Integer, Float, Boolean, Datetime, Array, and Table.


# This is a TOML document.

title = "TOML Example"

name = "Tom Preston-Werner"
dob = 1979-05-27T07:32:00-08:00 # First class dates

server = ""
ports = [ 8001, 8001, 8002 ]
connection_max = 5000
enabled = true


  # Indentation (tabs and/or spaces) is allowed but not required
  ip = ""
  dc = "eqdc10"

  ip = ""
  dc = "eqdc10"

data = [ ["gamma", "delta"], [1, 2] ]

# Line breaks are OK when inside arrays
hosts = [


  1. ^ "toml-lang github".
  2. ^ "projects using toml".
  3. ^ "toml implementations".
  4. ^ "cargo config".
  5. ^ "TOML, Tom's Own Markup Language". Y Combinator Link. Y Combinator. Retrieved May 10, 2017.