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@madsem
Last active February 7, 2022 11:09
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Cloudflare Worker GeoLocation API

Roll Your Own Geolocation Service On Cloudflare

Simply paste script into a Cloudflare Worker, fetch from any other domain, profit.

Example Response

{
  "country": "Germany",
  "country_code": "DE",
  "city": "Hamburg",
  "state": "Free and Hanseatic City of Hamburg",
  "state_code": "HH",
  "latitude": "53.54960",
  "longitude": "9.93550",
  "is_eu": "1",
  "timezone": "Europe/Berlin",
  "isp": "Deutsche Telekom AG",
  "zip": "22765"
}

TODO:

Make it possible to return localized strings for country, city & state
First thoughts:

  • Hook into deepl api (requires subscription)
  • Use Cloudflares KV storage to save localizations, so API is only queries once for every localization.
const isoCountries = {
AF: "Afghanistan",
AX: "Aland Islands",
AL: "Albania",
DZ: "Algeria",
AS: "American Samoa",
AD: "Andorra",
AO: "Angola",
AI: "Anguilla",
AQ: "Antarctica",
AG: "Antigua And Barbuda",
AR: "Argentina",
AM: "Armenia",
AW: "Aruba",
AU: "Australia",
AT: "Austria",
AZ: "Azerbaijan",
BS: "Bahamas",
BH: "Bahrain",
BD: "Bangladesh",
BB: "Barbados",
BY: "Belarus",
BE: "Belgium",
BZ: "Belize",
BJ: "Benin",
BM: "Bermuda",
BT: "Bhutan",
BO: "Bolivia",
BA: "Bosnia And Herzegovina",
BW: "Botswana",
BV: "Bouvet Island",
BR: "Brazil",
IO: "British Indian Ocean Territory",
BN: "Brunei Darussalam",
BG: "Bulgaria",
BF: "Burkina Faso",
BI: "Burundi",
KH: "Cambodia",
CM: "Cameroon",
CA: "Canada",
CV: "Cape Verde",
KY: "Cayman Islands",
CF: "Central African Republic",
TD: "Chad",
CL: "Chile",
CN: "China",
CX: "Christmas Island",
CC: "Cocos (Keeling) Islands",
CO: "Colombia",
KM: "Comoros",
CG: "Congo",
CD: "Congo, Democratic Republic",
CK: "Cook Islands",
CR: "Costa Rica",
CI: "Cote D'Ivoire",
HR: "Croatia",
CU: "Cuba",
CY: "Cyprus",
CZ: "Czech Republic",
DK: "Denmark",
DJ: "Djibouti",
DM: "Dominica",
DO: "Dominican Republic",
EC: "Ecuador",
EG: "Egypt",
SV: "El Salvador",
GQ: "Equatorial Guinea",
ER: "Eritrea",
EE: "Estonia",
ET: "Ethiopia",
FK: "Falkland Islands (Malvinas)",
FO: "Faroe Islands",
FJ: "Fiji",
FI: "Finland",
FR: "France",
GF: "French Guiana",
PF: "French Polynesia",
TF: "French Southern Territories",
GA: "Gabon",
GM: "Gambia",
GE: "Georgia",
DE: "Germany",
GH: "Ghana",
GI: "Gibraltar",
GR: "Greece",
GL: "Greenland",
GD: "Grenada",
GP: "Guadeloupe",
GU: "Guam",
GT: "Guatemala",
GG: "Guernsey",
GN: "Guinea",
GW: "Guinea-Bissau",
GY: "Guyana",
HT: "Haiti",
HM: "Heard Island & Mcdonald Islands",
VA: "Holy See (Vatican City State)",
HN: "Honduras",
HK: "Hong Kong",
HU: "Hungary",
IS: "Iceland",
IN: "India",
ID: "Indonesia",
IR: "Iran, Islamic Republic Of",
IQ: "Iraq",
IE: "Ireland",
IM: "Isle Of Man",
IL: "Israel",
IT: "Italy",
JM: "Jamaica",
JP: "Japan",
JE: "Jersey",
JO: "Jordan",
KZ: "Kazakhstan",
KE: "Kenya",
KI: "Kiribati",
KR: "Korea",
KW: "Kuwait",
KG: "Kyrgyzstan",
LA: "Lao People's Democratic Republic",
LV: "Latvia",
LB: "Lebanon",
LS: "Lesotho",
LR: "Liberia",
LY: "Libyan Arab Jamahiriya",
LI: "Liechtenstein",
LT: "Lithuania",
LU: "Luxembourg",
MO: "Macao",
MK: "Macedonia",
MG: "Madagascar",
MW: "Malawi",
MY: "Malaysia",
MV: "Maldives",
ML: "Mali",
MT: "Malta",
MH: "Marshall Islands",
MQ: "Martinique",
MR: "Mauritania",
MU: "Mauritius",
YT: "Mayotte",
MX: "Mexico",
FM: "Micronesia, Federated States Of",
MD: "Moldova",
MC: "Monaco",
MN: "Mongolia",
ME: "Montenegro",
MS: "Montserrat",
MA: "Morocco",
MZ: "Mozambique",
MM: "Myanmar",
NA: "Namibia",
NR: "Nauru",
NP: "Nepal",
NL: "Netherlands",
AN: "Netherlands Antilles",
NC: "New Caledonia",
NZ: "New Zealand",
NI: "Nicaragua",
NE: "Niger",
NG: "Nigeria",
NU: "Niue",
NF: "Norfolk Island",
MP: "Northern Mariana Islands",
NO: "Norway",
OM: "Oman",
PK: "Pakistan",
PW: "Palau",
PS: "Palestinian Territory, Occupied",
PA: "Panama",
PG: "Papua New Guinea",
PY: "Paraguay",
PE: "Peru",
PH: "Philippines",
PN: "Pitcairn",
PL: "Poland",
PT: "Portugal",
PR: "Puerto Rico",
QA: "Qatar",
RE: "Reunion",
RO: "Romania",
RU: "Russian Federation",
RW: "Rwanda",
BL: "Saint Barthelemy",
SH: "Saint Helena",
KN: "Saint Kitts And Nevis",
LC: "Saint Lucia",
MF: "Saint Martin",
PM: "Saint Pierre And Miquelon",
VC: "Saint Vincent And Grenadines",
WS: "Samoa",
SM: "San Marino",
ST: "Sao Tome And Principe",
SA: "Saudi Arabia",
SN: "Senegal",
RS: "Serbia",
SC: "Seychelles",
SL: "Sierra Leone",
SG: "Singapore",
SK: "Slovakia",
SI: "Slovenia",
SB: "Solomon Islands",
SO: "Somalia",
ZA: "South Africa",
GS: "South Georgia And Sandwich Isl.",
ES: "Spain",
LK: "Sri Lanka",
SD: "Sudan",
SR: "Suriname",
SJ: "Svalbard And Jan Mayen",
SZ: "Swaziland",
SE: "Sweden",
CH: "Switzerland",
SY: "Syrian Arab Republic",
TW: "Taiwan",
TJ: "Tajikistan",
TZ: "Tanzania",
TH: "Thailand",
TL: "Timor-Leste",
TG: "Togo",
TK: "Tokelau",
TO: "Tonga",
TT: "Trinidad And Tobago",
TN: "Tunisia",
TR: "Turkey",
TM: "Turkmenistan",
TC: "Turks And Caicos Islands",
TV: "Tuvalu",
UG: "Uganda",
UA: "Ukraine",
AE: "United Arab Emirates",
GB: "United Kingdom",
US: "United States",
UM: "United States Outlying Islands",
UY: "Uruguay",
UZ: "Uzbekistan",
VU: "Vanuatu",
VE: "Venezuela",
VN: "Viet Nam",
VG: "Virgin Islands, British",
VI: "Virgin Islands, U.S.",
WF: "Wallis And Futuna",
EH: "Western Sahara",
YE: "Yemen",
ZM: "Zambia",
ZW: "Zimbabwe",
};
const getCountryName = (countryCode) => {
if (isoCountries.hasOwnProperty(countryCode)) {
return isoCountries[countryCode];
} else {
return countryCode;
}
};
addEventListener("fetch", (event) => {
const headers = new Headers({
"Access-Control-Allow-Origin": "*",
"Access-Control-Allow-Methods": "GET, HEAD, POST, OPTIONS",
"Access-Control-Allow-Headers": "*",
"Content-Type": "application/json;charset=UTF-8",
});
const countryCode = event.request.cf.country;
const country = getCountryName(countryCode);
const data = {
country: country,
country_code: countryCode,
city: event.request.cf.city,
state: event.request.cf.region,
state_code: event.request.cf.regionCode,
latitude: event.request.cf.latitude,
longitude: event.request.cf.longitude,
is_eu: event.request.cf.isEUCountry,
timezone: event.request.cf.timezone,
isp: event.request.cf.asOrganization,
zip: event.request.cf.postalCode,
};
return event.respondWith(
new Response(JSON.stringify(data, null, 2), {
status: 200,
headers: headers,
})
);
});
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