Detect JS Framework used in a Website

detect-js-framework.js

// Paste these lines into website's console (Win/Linux: Ctrl + Shift + I / Mac: Cmd + Alt + I)

if(!!window.React ||
   !!document.querySelector('[data-reactroot], [data-reactid]') ||
   Array.from(document.querySelectorAll('*')).some(e => e._reactRootContainer !== undefined || Object.keys(e).some(k => k.startsWith('__reactContainer')))
)
  console.log('React.js');

if(!!document.querySelector('script[id=__NEXT_DATA__]'))
  console.log('Next.js');

if(!!document.querySelector('[id=___gatsby]'))
  console.log('Gatsby.js');

if(!!window.angular ||
   !!document.querySelector('.ng-binding, [ng-app], [data-ng-app], [ng-controller], [data-ng-controller], [ng-repeat], [data-ng-repeat]') ||
   !!document.querySelector('script[src*="angular.js"], script[src*="angular.min.js"]')
)
  console.log('Angular.js');

if (!!window.getAllAngularRootElements || !!window.ng?.coreTokens?.NgZone)
  console.log('Angular');

if(!!window.Backbone) console.log('Backbone.js');
if(!!window.Ember) console.log('Ember.js');
if(!!window.Vue) console.log('Vue.js');
if(!!window.Meteor) console.log('Meteor.js');
if(!!window.Zepto) console.log('Zepto.js');
if(!!window.jQuery) console.log('jQuery.js');

// Svelte.js detection

if(!!document.querySelector('[data-svelte-h]') || !!document.querySelector('sveltekit-endpoint, sveltekit-app'))
  console.log('Svelte.js/SvelteKit');