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HTTP/2 301 server: GitHub.com content-type: text/html location: https://nodeca.github.io/js-yaml/ x-github-request-id: F6A9:2685F2:7EC23F:8E5BEE:6951983C accept-ranges: bytes age: 0 date: Sun, 28 Dec 2025 20:51:08 GMT via: 1.1 varnish x-served-by: cache-bom-vanm7210085-BOM x-cache: MISS x-cache-hits: 0 x-timer: S1766955069.640033,VS0,VE199 vary: Accept-Encoding x-fastly-request-id: 8f743627588e5329a3705425cbda57cb3799a21c content-length: 162 HTTP/2 200 server: GitHub.com content-type: text/html; charset=utf-8 last-modified: Wed, 12 Nov 2025 15:18:09 GMT access-control-allow-origin: * etag: W/"6914a531-1952" expires: Sun, 28 Dec 2025 21:01:08 GMT cache-control: max-age=600 content-encoding: gzip x-proxy-cache: MISS x-github-request-id: E51C:2F7ECD:80042E:8F9D9C:6951983C accept-ranges: bytes age: 0 date: Sun, 28 Dec 2025 20:51:09 GMT via: 1.1 varnish x-served-by: cache-bom-vanm7210085-BOM x-cache: MISS x-cache-hits: 0 x-timer: S1766955069.852867,VS0,VE206 vary: Accept-Encoding x-fastly-request-id: 79e139fca87a65689324bdaf2f81a09a62489520 content-length: 2538 YAML parser for JavaScript - JS-YAML

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---
# Collection Types #############################################################
################################################################################
# https://yaml.org/type/map.html -----------------------------------------------#
map:
  # Unordered set of key: value pairs.
  Block style: !!map
    Clark : Evans
    Ingy  : döt Net
    Oren  : Ben-Kiki
  Flow style: !!map { Clark: Evans, Ingy: döt Net, Oren: Ben-Kiki }
# https://yaml.org/type/omap.html ----------------------------------------------#
omap:
  # Explicitly typed ordered map (dictionary).
  Bestiary: !!omap
    - aardvark: African pig-like ant eater. Ugly.
    - anteater: South-American ant eater. Two species.
    - anaconda: South-American constrictor snake. Scaly.
    # Etc.
  # Flow style
  Numbers: !!omap [ one: 1, two: 2, three : 3 ]
# https://yaml.org/type/pairs.html ---------------------------------------------#
pairs:
  # Explicitly typed pairs.
  Block tasks: !!pairs
    - meeting: with team.
    - meeting: with boss.
    - break: lunch.
    - meeting: with client.
  Flow tasks: !!pairs [ meeting: with team, meeting: with boss ]
# https://yaml.org/type/set.html -----------------------------------------------#
set:
  # Explicitly typed set.
  baseball players: !!set
    ? Mark McGwire
    ? Sammy Sosa
    ? Ken Griffey
  # Flow style
  baseball teams: !!set { Boston Red Sox, Detroit Tigers, New York Yankees }
# https://yaml.org/type/seq.html -----------------------------------------------#
seq:
  # Ordered sequence of nodes
  Block style: !!seq
  - Mercury   # Rotates - no light/dark sides.
  - Venus     # Deadliest. Aptly named.
  - Earth     # Mostly dirt.
  - Mars      # Seems empty.
  - Jupiter   # The king.
  - Saturn    # Pretty.
  - Uranus    # Where the sun hardly shines.
  - Neptune   # Boring. No rings.
  - Pluto     # You call this a planet?
  Flow style: !!seq [ Mercury, Venus, Earth, Mars,      # Rocks
                      Jupiter, Saturn, Uranus, Neptune, # Gas
                      Pluto ]                           # Overrated
# Scalar Types #################################################################
################################################################################
# https://yaml.org/type/bool.html ----------------------------------------------#
bool:
  - true
  - True
  - TRUE
  - false
  - False
  - FALSE
# https://yaml.org/type/float.html ---------------------------------------------#
float:
  canonical: 6.8523015e+5
  exponentioal: 685.230_15e+03
  fixed: 685_230.15
  negative infinity: -.inf
  not a number: .NaN
# https://yaml.org/type/int.html -----------------------------------------------#
int:
  canonical: 685230
  decimal: +685_230
  octal: 0o2472256
  hexadecimal: 0x_0A_74_AE
  binary: 0b1010_0111_0100_1010_1110
# https://yaml.org/type/merge.html ---------------------------------------------#
merge:
  - &CENTER { x: 1, y: 2 }
  - &LEFT { x: 0, y: 2 }
  - &BIG { r: 10 }
  - &SMALL { r: 1 }
  # All the following maps are equal:
  - # Explicit keys
    x: 1
    y: 2
    r: 10
    label: nothing
  - # Merge one map
    << : *CENTER
    r: 10
    label: center
  - # Merge multiple maps
    << : [ *CENTER, *BIG ]
    label: center/big
  - # Override
    << : [ *BIG, *LEFT, *SMALL ]
    x: 1
    label: big/left/small
# https://yaml.org/type/null.html ----------------------------------------------#
null:
  # This mapping has four keys,
  # one has a value.
  empty:
  canonical: ~
  english: null
  ~: null key
  # This sequence has five
  # entries, two have values.
  sparse:
    - ~
    - 2nd entry
    -
    - 4th entry
    - Null
# https://yaml.org/type/str.html -----------------------------------------------#
string: abcd
# https://yaml.org/type/timestamp.html -----------------------------------------#
timestamp:
  canonical:        2001-12-15T02:59:43.1Z
  valid iso8601:    2001-12-14t21:59:43.10-05:00
  space separated:  2001-12-14 21:59:43.10 -5
  no time zone (Z): 2001-12-15 2:59:43.10
  date (00:00:00Z): 2002-12-14
# Custom types #################################################################
################################################################################
# JS-YAML allows you to specify a custom YAML types for your structures.
# This is a simple example of custom constructor defined in `js/demo.js` for
# custom `!sexy` type:
#
# var SexyYamlType = new jsyaml.Type('!sexy', {
#   kind: 'sequence',
#   construct: function (data) {
#     return data.map(function (string) { return 'sexy ' + string; });
#   }
# });
#
# var SEXY_SCHEMA = jsyaml.Schema.create([ SexyYamlType ]);
#
# result = jsyaml.load(yourData, { schema: SEXY_SCHEMA });
foobar: !sexy
  - bunny
  - chocolate

Result (JS object dump):

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JS-YAML demo. YAML JavaScript parser.

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Result (JS object dump):