getDomainName

getDomainName.js

function getDomainName(url) {
  if (!/^http|https|wss|ssh|ftp/i.test(url)) {
    url = `http://${url}`;
  }

  let { hostname } = new URL(url);
  hostname = hostname.split(".").filter(Boolean);

  function getSuffixIndex(hostname) {
    const Icann = ["com", "net", "org", "edu", "gov", "mil", "int"];
    const CountryTlds = ["ac", "ad", "ae", "af", "ag", "ai", "al", "am", "ao", "aq", "ar", "as", "at", "au", "aw", "ax", "az", "ba", "bb", "bd", "be", "bf", "bg", "bh", "bi", "bj", "bm", "bn", "bo", "bq", "br", "bs", "bt", "bw", "by", "bz", "ca", "cc", "cd", "cf", "cg", "ch", "ci", "ck", "cl", "cm", "cn", "co", "cr", "cu", "cv", "cw", "cx", "cy", "cz", "de", "dj", "dk", "dm", "do", "dz", "ec", "ee", "eg", "eh", "er", "es", "et", "eu", "fi", "fj", "fk", "fm", "fo", "fr", "ga", "gd", "ge", "gf", "gg", "gh", "gi", "gl", "gm", "gn", "gp", "gq", "gr", "gs", "gt", "gu", "gw", "gy", "hk", "hm", "hn", "hr", "ht", "hu", "id", "ie", "il", "im", "in", "io", "iq", "ir", "is", "it", "je", "jm", "jo", "jp", "ke", "kg", "kh", "ki", "km", "kn", "kp", "kr", "kw", "ky", "kz", "la", "lb", "lc", "li", "lk", "lr", "ls", "lt", "lu", "lv", "ly", "ma", "mc", "md", "me", "mg", "mh", "mk", "ml", "mm", "mn", "mo", "mp", "mq", "mr", "ms", "mt", "mu", "mv", "mw", "mx", "my", "mz", "na", "nc", "ne", "nf", "ng", "ni", "nl", "no", "np", "nr", "nu", "nz", "om", "pa", "pe", "pf", "pg", "ph", "pk", "pl", "pm", "pn", "pr", "ps", "pt", "pw", "py", "qa", "re", "ro", "rs", "ru", "rw", "sa", "sb", "sc", "sd", "se", "sg", "sh", "si", "sk", "sl", "sm", "sn", "so", "sr", "ss", "st", "su", "sv", "sx", "sy", "sz", "tc", "td", "tf", "tg", "th", "tj", "tk", "tl", "tm", "tn", "to", "tr", "tt", "tv", "tw", "tz", "ua", "ug", "uk", "us", "uy", "uz", "va", "vc", "ve", "vg", "vi", "vn", "vu", "wf", "ws", "ye", "yt", "za", "zm", "zw", "xn--lgbbat1ad8j", "xn--y9a3aq", "xn--mgbcpq6gpa1a", "xn--54b7fta0cc", "xn--90ais", "xn--90ae", "xn--fiqs8s", "xn--fiqz9s", "xn--wgbh1c", "xn--e1a4c", "xn--qxa6a", "xn--node", "xn--qxam", "xn--j6w193g", "xn--h2brj9c", "xn--mgbbh1a71e", "xn--fpcrj9c3d", "xn--gecrj9c", "xn--s9brj9c", "xn--xkc2dl3a5ee0h", "xn--45brj9c", "xn--2scrj9c", "xn--rvc1e0am3e", "xn--45br5cyl", "xn--3hcrj9c", "xn--mgbbh1a", "xn--h2breg3eve", "xn--h2brj9c8c", "xn--mgbgu82a", "xn--mgba3a4f16a", "xn--mgbtx2b", "xn--4dbrk0ce", "xn--mgbayh7gpa", "xn--80ao21a", "xn--q7ce6a", "xn--mix082f", "xn--mix891f", "xn--mgbx4cd0ab", "xn--mgbah1a3hjkrd", "xn--l1acc", "xn--mgbc0a9azcg", "xn--d1alf", "xn--mgb9awbf", "xn--mgbai9azgqp6j", "xn--ygbi2ammx", "xn--wgbl6a", "xn--p1ai", "xn--mgberp4a5d4ar", "xn--90a3ac", "xn--yfro4i67o", "xn--clchc0ea0b2g2a9gcd", "xn--3e0b707e", "xn--fzc2c9e2c", "xn--xkc2al3hye2a", "xn--mgbpl2fh", "xn--ogbpf8fl", "xn--kprw13d", "xn--kpry57d", "xn--o3cw4h", "xn--pgbs0dh", "xn--j1amh", "xn--mgbaam7a8h", "xn--mgb2ddes",  "xn--11b4c3d", "xn--1ck2e1b", "xn--1qqw23a", "xn--30rr7y", "xn--3bst00m", "xn--3ds443g", "xn--3pxu8k", "xn--42c2d9a", "xn--45q11c", "xn--4gbrim", "xn--55qw42g", "xn--55qx5d", "xn--5su34j936bgsg", "xn--5tzm5g", "xn--6frz82g", "xn--6qq986b3xl", "xn--80adxhks", "xn--80aqecdr1a", "xn--80asehdb", "xn--80aswg", "xn--8y0a063a", "xn--9dbq2a", "xn--9et52u", "xn--9krt00a", "xn--b4w605ferd", "xn--bck1b9a5dre4c", "xn--c1avg", "xn--c2br7g", "xn--cck2b3b", "xn--cckwcxetd", "xn--cg4bki", "xn--czr694b", "xn--czrs0t", "xn--czru2d", "xn--d1acj3b", "xn--eckvdtc9d", "xn--efvy88h", "xn--fct429k", "xn--fhbei", "xn--fiq228c5hs", "xn--fiq64b", "xn--fjq720a", "xn--flw351e", "xn--fzys8d69uvgm", "xn--g2xx48c", "xn--gckr3f0f", "xn--gk3at1e", "xn--hxt814e", "xn--i1b6b1a6a2e", "xn--imr513n", "xn--io0a7i", "xn--j1aef", "xn--jlq480n2rg", "xn--jlq61u9w7b", "xn--jvr189m", "xn--kcrx77d1x4a", "xn--kput3i", "xn--mgba3a3ejt", "xn--mgba7c0bbn0a", "xn--mgbaakc7dvf", "xn--mgbab2bd", "xn--mgbca7dzdo", "xn--mgbi4ecexp", "xn--mgbt3dhd", "xn--mk1bu44c", "xn--mxtq1m", "xn--ngbc5azd", "xn--ngbe9e0a", "xn--ngbrx", "xn--nqv7f", "xn--nqv7fs00ema", "xn--nyqy26a", "xn--otu796d", "xn--p1acf", "xn--pssy2u", "xn--q9jyb4c", "xn--qcka1pmc", "xn--rhqv96g", "xn--rovu88b", "xn--ses554g", "xn--t60b56a", "xn--tckwe", "xn--tiq49xqyj", "xn--unup4y", "xn--vermgensberater-ctb", "xn--vermgensberatung-pwb", "xn--vhquv", "xn--vuq861b", "xn--w4r85el8fhu5dnra", "xn--w4rs40l", "xn--xhq521b", "xn--zfr164b"];
    const OtherTlds = ["arpa", "xxx", "xyz", "example", "invalid", "local", "localhost", "onion", "test", "ads", "ny", "io", "site", "vov", "msn", "msnbc"];

    const indexTlds = [];

    for (const index in hostname) {
      if (Icann.includes(hostname[index]) || CountryTlds.includes(hostname[index]) || OtherTlds.includes(hostname[index])) {
        indexTlds.push(index);
      }
    }

    return indexTlds.length ? Math.min(...indexTlds) : 0;
  }

  if (hostname.length >= 3) {
    const suffixIndex = getSuffixIndex(hostname);
    return suffixIndex ? hostname[suffixIndex - 1] : hostname[0];
  }

  return hostname[hostname.length - 2];
}

getDomainName.test.js

describe("Get domain name", () => {
  test("test domain Google", () => {
    expect(getDomainName("https://drive.google.com/drive/u/0/my-drive")).toBe("google");
    expect(getDomainName("http://google.com")).toBe("google");
  });

  test("test domain .*", () => {
    expect(getDomainName("https://www.com.vn")).toBe("com");
    expect(getDomainName("https://abc.www.com")).toBe("www");
    expect(getDomainName("https://Abc.allstate.com")).toBe("allstate");
    expect(getDomainName("https://Abc.allstate.vn")).toBe("allstate");
    expect(getDomainName("https://Abc.czzx.zone.vn")).toBe("zone");
    expect(getDomainName("https://tatamotors.vn")).toBe("tatamotors");
    expect(getDomainName("https://www.set-edu.com/")).toBe("set-edu");
    expect(getDomainName("https://vnexpress.net/")).toBe("vnexpress");
    expect(getDomainName("https://ny.gov/")).toBe("ny");
    expect(getDomainName("https://dictionary.cambridge.org/")).toBe("cambridge");
    expect(getDomainName("https://Pelé@example.com")).toBe("example");
    expect(getDomainName("https://vhost.localhost")).toBe("vhost");
    expect(getDomainName("https://github.dev")).toBe("github");
  });
  
  test("test domain .*.*", () => {
    expect(getDomainName("ftp://mapasamazonsa.com.ve/")).toBe("mapasamazonsa");
    expect(getDomainName("wss://119.92.223.221.prod.hosts.ooklaserver.net:8080/ws")).toBe("ooklaserver");
    expect(getDomainName("ssh://user:[email protected]/some/path?and&query#hash")).toBe("example");
    expect(getDomainName("http://ho.com.vn")).toBe("ho");
    expect(getDomainName("http://tatamotors.com.vn")).toBe("tatamotors");
    expect(getDomainName("http://hoc.vtc.vn/")).toBe("vtc");
    expect(getDomainName("http://A.b.c.d.com.vn.vn/")).toBe("d");
    expect(getDomainName("http://baoninhbinh.org.vn/")).toBe("baoninhbinh");
    expect(getDomainName("https://dantri.com.vn/")).toBe("dantri");
    expect(getDomainName("https://www.24h.com.vn/")).toBe("24h");
    expect(getDomainName("https://www.amherst.ny.us/")).toBe("amherst");
    expect(getDomainName("https://a.f.g.h.i.bar.baz.google.com/")).toBe("google");
    expect(getDomainName("http://llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch.co.uk/")).toBe("llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch");
    
  });

  test("test youtube", () => {
    expect(getDomainName("https://www.youtube.com/watch?v=gDJJAs8GZGw")).toBe("youtube");
  });
  test("test domain notion", () => {
    expect(getDomainName("https://nganpham.notion.site/")).toBe("notion");
  });

  test("test github page", () => {
    expect(getDomainName("https://alixsep.github.io/yugilife/#/build")).toBe("github");
  });

  test("test deep web", () => {
    expect(getDomainName("https://ulrn6sryqaifefld.onion")).toBe("ulrn6sryqaifefld");
    expect(getDomainName("https://auutwvpt2zktxwng.onion/?cat=8")).toBe("auutwvpt2zktxwng");
  });

});