Language (`xx`) and locale identifier (`xx-yy`) codes, in JSON format

language-and-locale-codes.json

[
  {"desc": "Abkhaz", "code": "ab"},
  {"desc": "Afar", "code": "aa"},
  {"desc": "Afrikaans", "code": "af"},
  {"desc": "Akan", "code": "ak"},
  {"desc": "Albanian", "code": "sq"},
  {"desc": "Amharic", "code": "am"},
  {"desc": "Arabic", "code": "ar"},
  {"desc": "Aragonese", "code": "an"},
  {"desc": "Armenian", "code": "hy"},
  {"desc": "Assamese", "code": "as"},
  {"desc": "Avaric", "code": "av"},
  {"desc": "Avestan", "code": "ae"},
  {"desc": "Aymara", "code": "ay"},
  {"desc": "Azerbaijani", "code": "az"},
  {"desc": "Bambara", "code": "bm"},
  {"desc": "Bashkir", "code": "ba"},
  {"desc": "Basque", "code": "eu"},
  {"desc": "Belarusian", "code": "be"},
  {"desc": "Bengali, Bangla", "code": "bn"},
  {"desc": "Bihari", "code": "bh"},
  {"desc": "Bislama", "code": "bi"},
  {"desc": "Bosnian", "code": "bs"},
  {"desc": "Breton", "code": "br"},
  {"desc": "Bulgarian", "code": "bg"},
  {"desc": "Burmese", "code": "my"},
  {"desc": "Catalan", "code": "ca"},
  {"desc": "Chamorro", "code": "ch"},
  {"desc": "Chechen", "code": "ce"},
  {"desc": "Chichewa, Chewa, Nyanja", "code": "ny"},
  {"desc": "Chinese", "code": "zh"},
  {"desc": "Chuvash", "code": "cv"},
  {"desc": "Cornish", "code": "kw"},
  {"desc": "Corsican", "code": "co"},
  {"desc": "Cree", "code": "cr"},
  {"desc": "Croatian", "code": "hr"},
  {"desc": "Czech", "code": "cs"},
  {"desc": "Danish", "code": "da"},
  {"desc": "Divehi, Dhivehi, Maldivian", "code": "dv"},
  {"desc": "Dutch", "code": "nl"},
  {"desc": "Dzongkha", "code": "dz"},
  {"desc": "English", "code": "en"},
  {"desc": "Esperanto", "code": "eo"},
  {"desc": "Estonian", "code": "et"},
  {"desc": "Ewe", "code": "ee"},
  {"desc": "Faroese", "code": "fo"},
  {"desc": "Fijian", "code": "fj"},
  {"desc": "Finnish", "code": "fi"},
  {"desc": "French", "code": "fr"},
  {"desc": "Fula, Fulah, Pulaar, Pular", "code": "ff"},
  {"desc": "Galician", "code": "gl"},
  {"desc": "Ganda", "code": "lg"},
  {"desc": "Georgian", "code": "ka"},
  {"desc": "German", "code": "de"},
  {"desc": "Greek (modern)", "code": "el"},
  {"desc": "Guaraní", "code": "gn"},
  {"desc": "Gujarati", "code": "gu"},
  {"desc": "Haitian, Haitian Creole", "code": "ht"},
  {"desc": "Hausa", "code": "ha"},
  {"desc": "Hebrew (modern)", "code": "he"},
  {"desc": "Herero", "code": "hz"},
  {"desc": "Hindi", "code": "hi"},
  {"desc": "Hiri Motu", "code": "ho"},
  {"desc": "Hungarian", "code": "hu"},
  {"desc": "Icelandic", "code": "is"},
  {"desc": "Ido", "code": "io"},
  {"desc": "Igbo", "code": "ig"},
  {"desc": "Indonesian", "code": "id"},
  {"desc": "Interlingua", "code": "ia"},
  {"desc": "Interlingue", "code": "ie"},
  {"desc": "Inuktitut", "code": "iu"},
  {"desc": "Inupiaq", "code": "ik"},
  {"desc": "Irish", "code": "ga"},
  {"desc": "Italian", "code": "it"},
  {"desc": "Japanese", "code": "ja"},
  {"desc": "Javanese", "code": "jv"},
  {"desc": "Kalaallisut, Greenlandic", "code": "kl"},
  {"desc": "Kannada", "code": "kn"},
  {"desc": "Kanuri", "code": "kr"},
  {"desc": "Kashmiri", "code": "ks"},
  {"desc": "Kazakh", "code": "kk"},
  {"desc": "Khmer", "code": "km"},
  {"desc": "Kikuyu, Gikuyu", "code": "ki"},
  {"desc": "Kinyarwanda", "code": "rw"},
  {"desc": "Kirundi", "code": "rn"},
  {"desc": "Komi", "code": "kv"},
  {"desc": "Kongo", "code": "kg"},
  {"desc": "Korean", "code": "ko"},
  {"desc": "Kurdish", "code": "ku"},
  {"desc": "Kwanyama, Kuanyama", "code": "kj"},
  {"desc": "Kyrgyz", "code": "ky"},
  {"desc": "Lao", "code": "lo"},
  {"desc": "Latin", "code": "la"},
  {"desc": "Latvian", "code": "lv"},
  {"desc": "Limburgish, Limburgan, Limburger", "code": "li"},
  {"desc": "Lingala", "code": "ln"},
  {"desc": "Lithuanian", "code": "lt"},
  {"desc": "Luba-Katanga", "code": "lu"},
  {"desc": "Luxembourgish, Letzeburgesch", "code": "lb"},
  {"desc": "Macedonian", "code": "mk"},
  {"desc": "Malagasy", "code": "mg"},
  {"desc": "Malay", "code": "ms"},
  {"desc": "Malayalam", "code": "ml"},
  {"desc": "Maltese", "code": "mt"},
  {"desc": "Manx", "code": "gv"},
  {"desc": "Marathi (Marāṭhī)", "code": "mr"},
  {"desc": "Marshallese", "code": "mh"},
  {"desc": "Mongolian", "code": "mn"},
  {"desc": "Montenegrin", "code": ""},
  {"desc": "Māori", "code": "mi"},
  {"desc": "Nauruan", "code": "na"},
  {"desc": "Navajo, Navaho", "code": "nv"},
  {"desc": "Ndonga", "code": "ng"},
  {"desc": "Nepali", "code": "ne"},
  {"desc": "Northern Ndebele", "code": "nd"},
  {"desc": "Northern Sami", "code": "se"},
  {"desc": "Norwegian", "code": "no"},
  {"desc": "Norwegian Bokmål", "code": "nb"},
  {"desc": "Norwegian Nynorsk", "code": "nn"},
  {"desc": "Nuosu", "code": "ii"},
  {"desc": "Occitan", "code": "oc"},
  {"desc": "Ojibwe, Ojibwa", "code": "oj"},
  {"desc": "Old Church Slavonic, Church Slavonic,Old Bulgarian", "code": "cu"},
  {"desc": "Oriya", "code": "or"},
  {"desc": "Oromo", "code": "om"},
  {"desc": "Ossetian, Ossetic", "code": "os"},
  {"desc": "Panjabi, Punjabi", "code": "pa"},
  {"desc": "Pashto, Pushto", "code": "ps"},
  {"desc": "Persian (Farsi)", "code": "fa"},
  {"desc": "Polish", "code": "pl"},
  {"desc": "Portuguese", "code": "pt"},
  {"desc": "Pāli", "code": "pi"},
  {"desc": "Quechua", "code": "qu"},
  {"desc": "Romanian", "code": "ro"},
  {"desc": "Romansh", "code": "rm"},
  {"desc": "Russian", "code": "ru"},
  {"desc": "Samoan", "code": "sm"},
  {"desc": "Sango", "code": "sg"},
  {"desc": "Sanskrit (Saṁskṛta)", "code": "sa"},
  {"desc": "Sardinian", "code": "sc"},
  {"desc": "Scottish Gaelic, Gaelic", "code": "gd"},
  {"desc": "Serbian", "code": "sr"},
  {"desc": "Shona", "code": "sn"},
  {"desc": "Sindhi", "code": "sd"},
  {"desc": "Sinhala, Sinhalese", "code": "si"},
  {"desc": "Slovak", "code": "sk"},
  {"desc": "Slovene", "code": "sl"},
  {"desc": "Somali", "code": "so"},
  {"desc": "Southern Ndebele", "code": "nr"},
  {"desc": "Southern Sotho", "code": "st"},
  {"desc": "Spanish", "code": "es"},
  {"desc": "Sundanese", "code": "su"},
  {"desc": "Swahili", "code": "sw"},
  {"desc": "Swati", "code": "ss"},
  {"desc": "Swedish", "code": "sv"},
  {"desc": "Tagalog", "code": "tl"},
  {"desc": "Tahitian", "code": "ty"},
  {"desc": "Tajik", "code": "tg"},
  {"desc": "Tamil", "code": "ta"},
  {"desc": "Tatar", "code": "tt"},
  {"desc": "Telugu", "code": "te"},
  {"desc": "Thai", "code": "th"},
  {"desc": "Tibetan Standard, Tibetan, Central", "code": "bo"},
  {"desc": "Tigrinya", "code": "ti"},
  {"desc": "Tonga (Tonga Islands)", "code": "to"},
  {"desc": "Tsonga", "code": "ts"},
  {"desc": "Tswana", "code": "tn"},
  {"desc": "Turkish", "code": "tr"},
  {"desc": "Turkmen", "code": "tk"},
  {"desc": "Twi", "code": "tw"},
  {"desc": "Ukrainian", "code": "uk"},
  {"desc": "Urdu", "code": "ur"},
  {"desc": "Uyghur", "code": "ug"},
  {"desc": "Uzbek", "code": "uz"},
  {"desc": "Venda", "code": "ve"},
  {"desc": "Vietnamese", "code": "vi"},
  {"desc": "Volapük", "code": "vo"},
  {"desc": "Walloon", "code": "wa"},
  {"desc": "Welsh", "code": "cy"},
  {"desc": "Western Frisian", "code": "fy"},
  {"desc": "Wolof", "code": "wo"},
  {"desc": "Xhosa", "code": "xh"},
  {"desc": "Yiddish", "code": "yi"},
  {"desc": "Yoruba", "code": "yo"},
  {"desc": "Zhuang, Chuang", "code": "za"},
  {"desc": "Zulu", "code": "zu"},

  {"desc": "Arabic - Algeria", "code": "ar-dz"},
  {"desc": "Arabic - Bahrain", "code": "ar-bh"},
  {"desc": "Arabic - Egypt", "code": "ar-eg"},
  {"desc": "Arabic - Iraq", "code": "ar-iq"},
  {"desc": "Arabic - Jordan", "code": "ar-jo"},
  {"desc": "Arabic - Kuwait", "code": "ar-kw"},
  {"desc": "Arabic - Lebanon", "code": "ar-lb"},
  {"desc": "Arabic - Libya", "code": "ar-ly"},
  {"desc": "Arabic - Morocco", "code": "ar-ma"},
  {"desc": "Arabic - Oman", "code": "ar-om"},
  {"desc": "Arabic - Qatar", "code": "ar-qa"},
  {"desc": "Arabic - Saudi Arabia", "code": "ar-sa"},
  {"desc": "Arabic - Syria", "code": "ar-sy"},
  {"desc": "Arabic - Tunisia", "code": "ar-tn"},
  {"desc": "Arabic - United Arab Emirates", "code": "ar-ae"},
  {"desc": "Arabic - Yemen", "code": "ar-ye"},
  {"desc": "Azeri - Cyrillic", "code": "az-az"},
  {"desc": "Azeri - Latin", "code": "az-az"},
  {"desc": "Chinese - China", "code": "zh-cn"},
  {"desc": "Chinese - Hong Kong SAR", "code": "zh-hk"},
  {"desc": "Chinese - Macau SAR", "code": "zh-mo"},
  {"desc": "Chinese - Singapore", "code": "zh-sg"},
  {"desc": "Chinese - Taiwan", "code": "zh-tw"},
  {"desc": "Dutch - Belgium", "code": "nl-be"},
  {"desc": "Dutch - Netherlands", "code": "nl-nl"},
  {"desc": "English - Australia", "code": "en-au"},
  {"desc": "English - Belize", "code": "en-bz"},
  {"desc": "English - Canada", "code": "en-ca"},
  {"desc": "English - Caribbean", "code": "en-cb"},
  {"desc": "English - Great Britain", "code": "en-gb"},
  {"desc": "English - India", "code": "en-in"},
  {"desc": "English - Ireland", "code": "en-ie"},
  {"desc": "English - Jamaica", "code": "en-jm"},
  {"desc": "English - New Zealand", "code": "en-nz"},
  {"desc": "English - Phillippines", "code": "en-ph"},
  {"desc": "English - Southern Africa", "code": "en-za"},
  {"desc": "English - Trinidad", "code": "en-tt"},
  {"desc": "English - United States", "code": "en-us"},
  {"desc": "French - Belgium", "code": "fr-be"},
  {"desc": "French - Canada", "code": "fr-ca"},
  {"desc": "French - France", "code": "fr-fr"},
  {"desc": "French - Luxembourg", "code": "fr-lu"},
  {"desc": "French - Switzerland", "code": "fr-ch"},
  {"desc": "Gaelic - Ireland", "code": "gd-ie"},
  {"desc": "German - Austria", "code": "de-at"},
  {"desc": "German - Germany", "code": "de-de"},
  {"desc": "German - Liechtenstein", "code": "de-li"},
  {"desc": "German - Luxembourg", "code": "de-lu"},
  {"desc": "German - Switzerland", "code": "de-ch"},
  {"desc": "Italian - Italy", "code": "it-it"},
  {"desc": "Italian - Switzerland", "code": "it-ch"},
  {"desc": "Malay - Brunei", "code": "ms-bn"},
  {"desc": "Malay - Malaysia", "code": "ms-my"},
  {"desc": "Norwegian - Bokml", "code": "no-no"},
  {"desc": "Norwegian - Nynorsk", "code": "no-no"},
  {"desc": "Portuguese - Brazil", "code": "pt-br"},
  {"desc": "Portuguese - Portugal", "code": "pt-pt"},
  {"desc": "Romanian - Moldova", "code": "ro-mo"},
  {"desc": "Russian - Moldova", "code": "ru-mo"},
  {"desc": "Serbian - Cyrillic", "code": "sr-sp"},
  {"desc": "Serbian - Latin", "code": "sr-sp"},
  {"desc": "Spanish - Argentina", "code": "es-ar"},
  {"desc": "Spanish - Bolivia", "code": "es-bo"},
  {"desc": "Spanish - Chile", "code": "es-cl"},
  {"desc": "Spanish - Colombia", "code": "es-co"},
  {"desc": "Spanish - Costa Rica", "code": "es-cr"},
  {"desc": "Spanish - Dominican Republic", "code": "es-do"},
  {"desc": "Spanish - Ecuador", "code": "es-ec"},
  {"desc": "Spanish - El Salvador", "code": "es-sv"},
  {"desc": "Spanish - Guatemala", "code": "es-gt"},
  {"desc": "Spanish - Honduras", "code": "es-hn"},
  {"desc": "Spanish - Mexico", "code": "es-mx"},
  {"desc": "Spanish - Nicaragua", "code": "es-ni"},
  {"desc": "Spanish - Panama", "code": "es-pa"},
  {"desc": "Spanish - Paraguay", "code": "es-py"},
  {"desc": "Spanish - Peru", "code": "es-pe"},
  {"desc": "Spanish - Puerto Rico", "code": "es-pr"},
  {"desc": "Spanish - Spain (Traditional)", "code": "es-es"},
  {"desc": "Spanish - Uruguay", "code": "es-uy"},
  {"desc": "Spanish - Venezuela", "code": "es-ve"},
  {"desc": "Swedish - Finland", "code": "sv-fi"},
  {"desc": "Swedish - Sweden", "code": "sv-se"},
  {"desc": "Uzbek - Cyrillic", "code": "uz-uz"},
  {"desc": "Uzbek - Latin", "code": "uz-uz"}
]

btw, Montenegrin seem to be me https://www.iso.org/obp/ui/#iso:code:3166:ME

also found more ~10+ missing and format is not consistent, so just pushed to this gist together with country code. Though thanks for the starting list

https://gist.github.com/liesislukas/6f3a0102b4d2ca7138f1c7c746247d9a