1. Using the Browser Console:
- Right-click on the page and select “Inspect” or press
Ctrl + Shift + I(Windows/Linux) or
Cmd + Opt + I(Mac) to open the DevTools.
- Go to the “Console” tab.
- Create a bookmark in Chrome.
- In the URL field, enter
- Click the bookmark when on a page to execute the code.
3. Executing External Scripts:
- Open the HTML file in Chrome by dragging it into a new tab.
- Alternatively, serve the file using a local server, e.g., with the
4. Using Developer Tools:
- Open DevTools (
Ctrl + Shift + Ior
Cmd + Opt + I).
- Go to the “Sources” tab.
- Navigate to the file you want to run or add your code directly.
- Right-click and choose “Run” or set breakpoints for debugging.
- Open DevTools and go to the “Sources” tab.
- Set breakpoints by clicking on line numbers.
- Use the “Debugger” tab to step through code and inspect variables.
Local Development Environment:
6. Setting Up a Local Server:
- Install Node.js if not already installed.
npm install -g http-serverto install the HTTP server globally.
- Navigate to your project folder in the terminal and run
- Open Chrome and access your project at
http://localhost:8080(or the specified port).
7. Using Browser Extensions:
Handling External Libraries:
8. Loading External Libraries:
- Use a CDN or download libraries like jQuery.
9. Content Security Policy (CSP):
- Some websites implement CSP, which restricts the execution of inline scripts.
- Adjust your code or use a browser extension that bypasses CSP for testing.
The Site settings page will show you a list of sites and their configuration. Most websites require JS to function properly. If you disable it, most interactive elements that make them work won’t load on your computer. Additionally, features such as infographics and payment gateways may not work at all.
Create a.js file
To use this tool, users must first open a webpage or site in Chrome. They can then right click anywhere in the browser window and select Inspect element. They can also click the menu icon (three dots in the top-right corner of the browser) and select More tools > Web developer tools or use a keyboard shortcut like command+option+I on Mac and Ctrl+Shift+I on Windows.
Once the Web Developer Tools have opened, users can click anywhere in the page to access the DOM tree. They can then choose an element and click inspect to view its details. They can also set breakpoints in the JS file to debug their code. These include conditional breakpoints, uncaught exception breakpoints, and XHR breakpoints.
Run a.js file
To open Chrome Dev Tools, press F12 on your keyboard or right-click anywhere in the browser. Once it opens, select the “Sources” tab and then click + New snippet.