Browser Detect https://unpkg.com/detect-browser@3.0.0/index.js

browser-detect.js

function detect() {
  if (typeof navigator !== 'undefined') {
    return parseUserAgent(navigator.userAgent);
  }

  return getNodeVersion();
}

function detectOS(userAgentString) {
  var rules = getOperatingSystemRules();
  var detected = rules.filter(function (os) {
    return os.rule && os.rule.test(userAgentString);
  })[0];

  return detected ? detected.name : null;
}

function getNodeVersion() {
  var isNode = typeof process !== 'undefined' && process.version;
  return isNode && {
    name: 'node',
    version: process.version.slice(1),
    os: process.platform
  };
}

function parseUserAgent(userAgentString) {
  var browsers = getBrowserRules();
  if (!userAgentString) {
    return null;
  }

  var detected = browsers.map(function(browser) {
    var match = browser.rule.exec(userAgentString);
    var version = match && match[1].split(/[._]/).slice(0,3);

    if (version && version.length < 3) {
      version = version.concat(version.length == 1 ? [0, 0] : [0]);
    }

    return match && {
      name: browser.name,
      version: version.join('.')
    };
  }).filter(Boolean)[0] || null;

  if (detected) {
    detected.os = detectOS(userAgentString);
  }

  if (/alexa|bot|crawl(er|ing)|facebookexternalhit|feedburner|google web preview|nagios|postrank|pingdom|slurp|spider|yahoo!|yandex/i.test(userAgentString)) {
    detected = detected || {};
    detected.bot = true;
  }

  return detected;
}

function getBrowserRules() {
  return buildRules([
    [ 'aol', /AOLShield\/([0-9\._]+)/ ],
    [ 'edge', /Edge\/([0-9\._]+)/ ],
    [ 'yandexbrowser', /YaBrowser\/([0-9\._]+)/ ],
    [ 'vivaldi', /Vivaldi\/([0-9\.]+)/ ],
    [ 'kakaotalk', /KAKAOTALK\s([0-9\.]+)/ ],
    [ 'samsung', /SamsungBrowser\/([0-9\.]+)/ ],
    [ 'chrome', /(?!Chrom.*OPR)Chrom(?:e|ium)\/([0-9\.]+)(:?\s|$)/ ],
    [ 'phantomjs', /PhantomJS\/([0-9\.]+)(:?\s|$)/ ],
    [ 'crios', /CriOS\/([0-9\.]+)(:?\s|$)/ ],
    [ 'firefox', /Firefox\/([0-9\.]+)(?:\s|$)/ ],
    [ 'fxios', /FxiOS\/([0-9\.]+)/ ],
    [ 'opera', /Opera\/([0-9\.]+)(?:\s|$)/ ],
    [ 'opera', /OPR\/([0-9\.]+)(:?\s|$)$/ ],
    [ 'ie', /Trident\/7\.0.*rv\:([0-9\.]+).*\).*Gecko$/ ],
    [ 'ie', /MSIE\s([0-9\.]+);.*Trident\/[4-7].0/ ],
    [ 'ie', /MSIE\s(7\.0)/ ],
    [ 'bb10', /BB10;\sTouch.*Version\/([0-9\.]+)/ ],
    [ 'android', /Android\s([0-9\.]+)/ ],
    [ 'ios', /Version\/([0-9\._]+).*Mobile.*Safari.*/ ],
    [ 'safari', /Version\/([0-9\._]+).*Safari/ ],
    [ 'facebook', /FBAV\/([0-9\.]+)/],
    [ 'instagram', /Instagram\ ([0-9\.]+)/],
    [ 'ios-webview', /AppleWebKit\/([0-9\.]+).*Mobile/]
  ]);
}

function getOperatingSystemRules() {
  return buildRules([
    [ 'iOS', /iP(hone|od|ad)/ ],
    [ 'Android OS', /Android/ ],
    [ 'BlackBerry OS', /BlackBerry|BB10/ ],
    [ 'Windows Mobile', /IEMobile/ ],
    [ 'Amazon OS', /Kindle/ ],
    [ 'Windows 3.11', /Win16/ ],
    [ 'Windows 95', /(Windows 95)|(Win95)|(Windows_95)/ ],
    [ 'Windows 98', /(Windows 98)|(Win98)/ ],
    [ 'Windows 2000', /(Windows NT 5.0)|(Windows 2000)/ ],
    [ 'Windows XP', /(Windows NT 5.1)|(Windows XP)/ ],
    [ 'Windows Server 2003', /(Windows NT 5.2)/ ],
    [ 'Windows Vista', /(Windows NT 6.0)/ ],
    [ 'Windows 7', /(Windows NT 6.1)/ ],
    [ 'Windows 8', /(Windows NT 6.2)/ ],
    [ 'Windows 8.1', /(Windows NT 6.3)/ ],
    [ 'Windows 10', /(Windows NT 10.0)/ ],
    [ 'Windows ME', /Windows ME/ ],
    [ 'Open BSD', /OpenBSD/ ],
    [ 'Sun OS', /SunOS/ ],
    [ 'Linux', /(Linux)|(X11)/ ],
    [ 'Mac OS', /(Mac_PowerPC)|(Macintosh)/ ],
    [ 'QNX', /QNX/ ],
    [ 'BeOS', /BeOS/ ],
    [ 'OS/2', /OS\/2/ ],
    [ 'Search Bot', /(nuhk)|(Googlebot)|(Yammybot)|(Openbot)|(Slurp)|(MSNBot)|(Ask Jeeves\/Teoma)|(ia_archiver)/ ]
  ]);
}

function buildRules(ruleTuples) {
  return ruleTuples.map(function(tuple) {
    return {
      name: tuple[0],
      rule: tuple[1]
    };
  });
}