ISO 3166 Country Code to ISO 639 'Official Language Codes' for each country

codes.json

{
  "AD": "ca",
  "AE": "ar-AE,fa,en,hi,ur",
  "AF": "fa-AF,ps,uz-AF,tk",
  "AG": "en-AG",
  "AI": "en-AI",
  "AL": "sq,el",
  "AM": "hy",
  "AN": "nl-AN,en,es",
  "AO": "pt-AO",
  "AQ": "",
  "AR": "es-AR,en,it,de,fr,gn",
  "AS": "en-AS,sm,to",
  "AT": "de-AT,hr,hu,sl",
  "AU": "en-AU",
  "AW": "nl-AW,pap,es,en",
  "AX": "sv-AX",
  "AZ": "az,ru,hy",
  "BA": "bs,hr-BA,sr-BA",
  "BB": "en-BB",
  "BD": "bn-BD,en",
  "BE": "nl-BE,fr-BE,de-BE",
  "BF": "fr-BF,mos",
  "BG": "bg,tr-BG,rom",
  "BH": "ar-BH,en,fa,ur",
  "BI": "fr-BI,rn",
  "BJ": "fr-BJ",
  "BL": "fr",
  "BM": "en-BM,pt",
  "BN": "ms-BN,en-BN",
  "BO": "es-BO,qu,ay",
  "BQ": "nl,pap,en",
  "BR": "pt-BR,es,en,fr",
  "BS": "en-BS",
  "BT": "dz",
  "BV": "",
  "BW": "en-BW,tn-BW",
  "BY": "be,ru",
  "BZ": "en-BZ,es",
  "CA": "en-CA,fr-CA,iu",
  "CC": "ms-CC,en",
  "CD": "fr-CD,ln,ktu,kg,sw,lua",
  "CF": "fr-CF,sg,ln,kg",
  "CG": "fr-CG,kg,ln-CG",
  "CH": "de-CH,fr-CH,it-CH,rm",
  "CI": "fr-CI",
  "CK": "en-CK,mi",
  "CL": "es-CL",
  "CM": "en-CM,fr-CM",
  "CN": "zh-CN,yue,wuu,dta,ug,za",
  "CO": "es-CO",
  "CR": "es-CR,en",
  "CS": "cu,hu,sq,sr",
  "CU": "es-CU,pap",
  "CV": "pt-CV",
  "CW": "nl,pap",
  "CX": "en,zh,ms-CX",
  "CY": "el-CY,tr-CY,en",
  "CZ": "cs,sk",
  "DE": "de",
  "DJ": "fr-DJ,ar,so-DJ,aa",
  "DK": "da-DK,en,fo,de-DK",
  "DM": "en-DM",
  "DO": "es-DO",
  "DZ": "ar-DZ",
  "EC": "es-EC",
  "EE": "et,ru",
  "EG": "ar-EG,en,fr",
  "EH": "ar,mey",
  "ER": "aa-ER,ar,tig,kun,ti-ER",
  "ES": "es-ES,ca,gl,eu,oc",
  "ET": "am,en-ET,om-ET,ti-ET,so-ET,sid",
  "FI": "fi-FI,sv-FI,smn",
  "FJ": "en-FJ,fj",
  "FK": "en-FK",
  "FM": "en-FM,chk,pon,yap,kos,uli,woe,nkr,kpg",
  "FO": "fo,da-FO",
  "FR": "fr-FR,frp,br,co,ca,eu,oc",
  "GA": "fr-GA",
  "GB": "en-GB,cy-GB,gd",
  "GD": "en-GD",
  "GE": "ka,ru,hy,az",
  "GF": "fr-GF",
  "GG": "en,nrf",
  "GH": "en-GH,ak,ee,tw",
  "GI": "en-GI,es,it,pt",
  "GL": "kl,da-GL,en",
  "GM": "en-GM,mnk,wof,wo,ff",
  "GN": "fr-GN",
  "GP": "fr-GP",
  "GQ": "es-GQ,fr,pt",
  "GR": "el-GR,en,fr",
  "GS": "en",
  "GT": "es-GT",
  "GU": "en-GU,ch-GU",
  "GW": "pt-GW,pov",
  "GY": "en-GY",
  "HK": "zh-HK,yue,zh,en",
  "HM": "",
  "HN": "es-HN,cab,miq",
  "HR": "hr-HR,sr",
  "HT": "ht,fr-HT",
  "HU": "hu-HU",
  "ID": "id,en,nl,jv",
  "IE": "en-IE,ga-IE",
  "IL": "he,ar-IL,en-IL,",
  "IM": "en,gv",
  "IN": "en-IN,hi,bn,te,mr,ta,ur,gu,kn,ml,or,pa,as,bh,sat,ks,ne,sd,kok,doi,mni,sit,sa,fr,lus,inc",
  "IO": "en-IO",
  "IQ": "ar-IQ,ku,hy",
  "IR": "fa-IR,ku",
  "IS": "is,en,de,da,sv,no",
  "IT": "it-IT,de-IT,fr-IT,sc,ca,co,sl",
  "JE": "en,fr,nrf",
  "JM": "en-JM",
  "JO": "ar-JO,en",
  "JP": "ja",
  "KE": "en-KE,sw-KE",
  "KG": "ky,uz,ru",
  "KH": "km,fr,en",
  "KI": "en-KI,gil",
  "KM": "ar,fr-KM",
  "KN": "en-KN",
  "KP": "ko-KP",
  "KR": "ko-KR,en",
  "KW": "ar-KW,en",
  "KY": "en-KY",
  "KZ": "kk,ru",
  "LA": "lo,fr,en",
  "LB": "ar-LB,fr-LB,en,hy",
  "LC": "en-LC",
  "LI": "de-LI",
  "LK": "si,ta,en",
  "LR": "en-LR",
  "LS": "en-LS,st,zu,xh",
  "LT": "lt,ru,pl",
  "LU": "lb,de-LU,fr-LU",
  "LV": "lv,ru,lt",
  "LY": "ar-LY,it,en",
  "MA": "ar-MA,ber,fr",
  "MC": "fr-MC,en,it",
  "MD": "ro,ru,gag,tr",
  "ME": "sr,hu,bs,sq,hr,rom",
  "MF": "fr",
  "MG": "fr-MG,mg",
  "MH": "mh,en-MH",
  "MK": "mk,sq,tr,rmm,sr",
  "ML": "fr-ML,bm",
  "MM": "my",
  "MN": "mn,ru",
  "MO": "zh,zh-MO,pt",
  "MP": "fil,tl,zh,ch-MP,en-MP",
  "MQ": "fr-MQ",
  "MR": "ar-MR,fuc,snk,fr,mey,wo",
  "MS": "en-MS",
  "MT": "mt,en-MT",
  "MU": "en-MU,bho,fr",
  "MV": "dv,en",
  "MW": "ny,yao,tum,swk",
  "MX": "es-MX",
  "MY": "ms-MY,en,zh,ta,te,ml,pa,th",
  "MZ": "pt-MZ,vmw",
  "NA": "en-NA,af,de,hz,naq",
  "NC": "fr-NC",
  "NE": "fr-NE,ha,kr,dje",
  "NF": "en-NF",
  "NG": "en-NG,ha,yo,ig,ff",
  "NI": "es-NI,en",
  "NL": "nl-NL,fy-NL",
  "NO": "no,nb,nn,se,fi",
  "NP": "ne,en",
  "NR": "na,en-NR",
  "NU": "niu,en-NU",
  "NZ": "en-NZ,mi",
  "OM": "ar-OM,en,bal,ur",
  "PA": "es-PA,en",
  "PE": "es-PE,qu,ay",
  "PF": "fr-PF,ty",
  "PG": "en-PG,ho,meu,tpi",
  "PH": "tl,en-PH,fil,ceb,ilo,hil,war,pam,bik,bcl,pag,mrw,tsg,mdh,cbk,krj,sgd,msb,akl,ibg,yka,mta,abx",
  "PK": "ur-PK,en-PK,pa,sd,ps,brh",
  "PL": "pl",
  "PM": "fr-PM",
  "PN": "en-PN",
  "PR": "en-PR,es-PR",
  "PS": "ar-PS",
  "PT": "pt-PT,mwl",
  "PW": "pau,sov,en-PW,tox,ja,fil,zh",
  "PY": "es-PY,gn",
  "QA": "ar-QA,es",
  "RE": "fr-RE",
  "RO": "ro,hu,rom",
  "RS": "sr,hu,bs,rom",
  "RU": "ru,tt,xal,cau,ady,kv,ce,tyv,cv,udm,tut,mns,bua,myv,mdf,chm,ba,inh,kbd,krc,av,sah,nog",
  "RW": "rw,en-RW,fr-RW,sw",
  "SA": "ar-SA",
  "SB": "en-SB,tpi",
  "SC": "en-SC,fr-SC",
  "SD": "ar-SD,en,fia",
  "SE": "sv-SE,se,sma,fi-SE",
  "SG": "cmn,en-SG,ms-SG,ta-SG,zh-SG",
  "SH": "en-SH",
  "SI": "sl,sh",
  "SJ": "no,ru",
  "SK": "sk,hu",
  "SL": "en-SL,men,tem",
  "SM": "it-SM",
  "SN": "fr-SN,wo,fuc,mnk",
  "SO": "so-SO,ar-SO,it,en-SO",
  "SR": "nl-SR,en,srn,hns,jv",
  "SS": "en",
  "ST": "pt-ST",
  "SV": "es-SV",
  "SX": "nl,en",
  "SY": "ar-SY,ku,hy,arc,fr,en",
  "SZ": "en-SZ,ss-SZ",
  "TC": "en-TC",
  "TD": "fr-TD,ar-TD,sre",
  "TF": "fr",
  "TG": "fr-TG,ee,hna,kbp,dag,ha",
  "TH": "th,en",
  "TJ": "tg,ru",
  "TK": "tkl,en-TK",
  "TL": "tet,pt-TL,id,en",
  "TM": "tk,ru,uz",
  "TN": "ar-TN,fr",
  "TO": "to,en-TO",
  "TR": "tr-TR,ku,diq,az,av",
  "TT": "en-TT,hns,fr,es,zh",
  "TV": "tvl,en,sm,gil",
  "TW": "zh-TW,zh,nan,hak",
  "TZ": "sw-TZ,en,ar",
  "UA": "uk,ru-UA,rom,pl,hu",
  "UG": "en-UG,lg,sw,ar",
  "UM": "en-UM",
  "US": "en-US,es-US,haw,fr",
  "UY": "es-UY",
  "UZ": "uz,ru,tg",
  "VA": "la,it,fr",
  "VC": "en-VC,fr",
  "VE": "es-VE",
  "VG": "en-VG",
  "VI": "en-VI",
  "VN": "vi,en,fr,zh,km",
  "VU": "bi,en-VU,fr-VU",
  "WF": "wls,fud,fr-WF",
  "WS": "sm,en-WS",
  "XK": "sq,sr",
  "YE": "ar-YE",
  "YT": "fr-YT",
  "ZA": "zu,xh,af,nso,en-ZA,tn,st,ts,ss,ve,nr",
  "ZM": "en-ZM,bem,loz,lun,lue,ny,toi",
  "ZW": "en-ZW,sn,nr,nd"
}

convert.js

// http://download.geonames.org/export/dump/countryInfo.txt

const fs = require('fs')
const raw = fs.readFileSync('countryInfo.txt', 'utf8').trim()
const data = raw
  .split('\n')
  .filter(r => !r.startsWith('#'))
  .map(r => r.split('\t'))
  .sort((a, b) => a[0].localeCompare(b[0]))

const json = {}
data.forEach(r => json[r[0]] = r[15])

console.log(JSON.stringify(json, null, 2))