How to include JavaScript file or library in Chrome console

Question

Is there a simpler  native perhaps   way to include an external script file in the Google Chrome browser   Currently I   m doing it like this   document head innerHTML      lt script src  http   example com file js  gt  lt  script gt

User · Answer

Install tampermonkey and add the following UserScript with one (or more) @match with specific page url (or a match of all pages: https://*) e.g.:

// ==UserScript==
// @name         inject-rx
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Inject rx library on the page
// @author       Me
// @match        https://www.some-website.com/*
// @require      https://cdnjs.cloudflare.com/ajax/libs/rxjs/6.5.4/rxjs.umd.min.js
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
     window.injectedRx = rxjs;
     //Or even:  window.rxjs = rxjs;

})();

Whenever you need the library on the console, or on a snippet enable the specific UserScript and refresh.

This solution prevents namespace pollution. You can use custom namespaces to avoid accidental overwrite of existing global variables on the page.

User · Answer

As a follow-up to the answer of  maciej-bukowski above      in modern browsers as of now  spring 2017  that support async await you can load as follows  In this example we load the load html2canvas library    x000D   x000D  async function loadScript url    x000D    let response   await fetch url   x000D    let script   await response text    x000D    eval script   x000D    x000D   x000D  let scriptUrl    https   cdnjs cloudflare com ajax libs html2canvas 0 4 1 html2canvas min js  x000D  loadScript scriptUrl   x000D   x000D   x000D    If you run the snippet and then open your browser s console you should see the function html2canvas   is now defined

User · Answer

If you re just starting out learning javascript  amp  don t want to spend time creating an entire webpage just for embedding test scripts  just open Dev Tools in a new tab in Chrome Browser  and click on Console  Then type out some test scripts  eg  console log  Aha      Then press Enter after every line  to submit for execution by Chrome  or load your own  quot external script file quot   document createElement  script   src    http   example com file js    Then call your functions  console log file function            Tested in Google Chrome 85 0 4183 121

User · Answer

Do you use some AJAX framework  Using jQuery it would be     getScript  script js      If you re not using any framework then see the answer by Harmen    Maybe it is not worth to use jQuery just to do this one simple thing  or maybe it is  but if you already have it loaded then you might as well use it  I have seen websites that have jQuery loaded e g  with Bootstrap but still use the DOM API directly in a way that is not always portable  instead of using the already loaded jQuery for that  and many people are not aware of the fact that even getElementById   doesn t work consistently on all browsers - see this answer for details    UPDATE   It s been years since I  wrote this answer and I  think it s worth pointing out here that today you can use    SystemJS ModuleLoader jspm io   to dynamically load scripts  Those may be relevant to people reading this question   See also  The Fluent 2014 talk by Guy Bedford  Practical Workflows for ES6 Modules

User · Answer

appendChild   is a more native way   var script   document createElement  script    script type    text javascript   script src    script js   document head appendChild script

User · Answer

In the modern browsers you can use the fetch to download resource  Mozilla docs  and then eval to execute it   For example to download Angular1 you need to type   fetch  https   cdnjs cloudflare com ajax libs angular js 1 5 8 angular min js        then response   gt  response text         then text   gt  eval text        then      gt       now you can use your library

User · Answer

If anyone  fails to load because hes script violates the script-src  Content Security Policy  or  because unsafe-eval  is not an allowed   I will advice using my pretty-small module-injector as a dev-tools snippet  then you ll be able to load like this    x000D   x000D  imports  https   cdnjs cloudflare com ajax libs moment js 2 24 0 moment js   x000D     then     gt alert  today is   moment   format  dddd        x000D   lt script src  https   raw githack com shmuelf PowerJS master src power-moduleInjector js  gt  lt  script gt  x000D   x000D   x000D    this solution works because    It loades the library in xhr - which allows CORS from console  and avoids the script-src policy  It uses the synchronous option of xhr which allows you to stay at the console snippet s context  so you ll have the permission to eval the script  and not to get-treated as an unsafe-eval

User · Answer

I use this to load ko knockout object in console  document write   lt script src  https   cdnjs cloudflare com ajax libs knockout 3 5 0 knockout-3 5 0 debug js  gt  lt  script gt       or host locally  document write   lt script src  http   localhost js knockout-3 5 0 debug js  gt  lt  script gt

User · Answer

var el   document createElement  script    loaded   false  el onload   el onreadystatechange   function        if   el readyState  amp  amp  el readyState      complete   amp  amp  el readyState      loaded      loaded        return false        el onload   el onreadystatechange   null    loaded   true       done     el async   true  el src   path  var hhead   document getElementsByTagName  head   0   hhead insertBefore el  hhead firstChild

User · Answer

In chrome  your best option might be the Snippets tab under Sources in the Developer Tools   It will allow you to write and run code  for example  in a about blank page   More information here  https   developers google com web tools chrome-devtools debug snippets  hl en

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