Chrome Dev Tools Hacks: Override JavaScript Files and Take Control of Websites

Introduction: In web development and debugging, it can be useful to override a JavaScript file on a webpage to test modifications or fix issues without altering the original source code. Chrome’s developer tools provide a convenient way to achieve this. In this article, we will walk you through the steps to override a JavaScript file on a webpage using Chrome’s developer tools.

Step 1: Prepare Your Modified JavaScript File Before getting started, save your modified JavaScript code as a separate .js file on your local machine. Choose a meaningful name for your file that reflects its purpose. For example, let’s assume you saved it as override.js.

Step 2: Access the Webpage and Open Developer Tools Open Google Chrome and navigate to the webpage where the JavaScript file you want to override is loaded. For demonstration purposes, let’s consider a fictional example where the JavaScript file is located at https://www.example.com/js/main.js. Right-click anywhere on the page and select “Inspect” from the context menu, or you can use the shortcut key F12 to open Chrome’s developer tools.

Step 3: Navigate to the “Sources” Tab In the developer tools window, locate the “Sources” tab. Click on it to switch to the “Sources” view.

Step 4: Add the Folder or File to Workspace (Optional) If you have the “Filesystem” section available in the left sidebar of the “Sources” tab, expand it and click on “Add folder to workspace” or “Add file to workspace”. Select the folder that contains your override.js file or choose the file directly. Grant any necessary permissions or file access requests.

Step 5: Find the JavaScript File to Override In the left sidebar of the “Sources” tab, locate the section that contains the website’s JavaScript files. It might be named “Page” or have a different name depending on the webpage structure. Expand the appropriate section and find the JavaScript file you want to override. For our fictional example, let’s say we want to override main.js.

Step 6: Save the JavaScript File Locally Right-click on the JavaScript file you want to override and select “Save as” or “Save for override”. Choose a location on your local machine to save the file. It’s recommended to save it in the same directory as your override.js file for convenience. Confirm the save operation and remember the saved file’s location.

Step 7: Add the JavaScript File to Workspace In the left sidebar of the “Sources” tab, under the “Filesystem” section, click on “Add folder to workspace” or “Add file to workspace” if you haven’t done so already in Step 4. Select the folder that contains the JavaScript file you just saved in Step 6 or choose the file directly. Grant any necessary permissions or file access requests.

Step 8: Map the Network Resource Right-click on the JavaScript file you added to the workspace in Step 7 and select “Map to Network Resource”. In the “Mapping Network Resource” dialog, enter the URL of the original JavaScript file that you want to override. For our example, it would be https://www.example.com/js/main.js. Click “OK” to confirm the mapping.

Step 9: Override the JavaScript File Right-click on the JavaScript file in the “Filesystem” section that you added to the workspace and select “Override” or “Override and Save to Workspace”. In the file selection dialog, choose your override.js file that you saved earlier. Chrome will now load your overridden JavaScript

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