Use the Chrome DevTools Sources panel to:
- View files.
- Set up a Workspace, so that changes you make in DevTools get saved to the code on your file system.
Use the Network pane to view all of the resources that the page has loaded.
How the Network pane is organized:
- The top-level, such as
topin Figure 1, represents an HTML frame. You'll find
topon every page that you visit.
toprepresents the main document frame.
- The second-level, such as
developers.google.comin Figure 1, represents an origin.
- The third-level, fourth-level, and so on, represent directories and resources that
were loaded from that origin. For example, in Figure 1 the full path to the
Click a file in the Network pane to view its contents in the Editor pane. You can view any type of file. For images, you see a preview of the image.
page to run your new code. For example, if you edit the
background-color of an element, you'll
see that change take effect immediately.
Command+S (Mac) or Control+S (Windows, Linux).
you make inside of functions. For example, in Figure 4 note how
console.log('B') does. If DevTools re-ran the entire script after making the
change, then the text
A would have been logged to the Console.
Create, save, and run Snippets
Snippets are scripts which you can run on any page. Imagine that you repeatedly type out the following code in the Console, in order to insert the jQuery library into a page, so that you can run jQuery commands from the Console:
let script = document.createElement('script'); script.src = 'https://code.jquery.com/jquery-3.2.1.min.js'; script.crossOrigin = 'anonymous'; script.integrity = 'sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4='; document.head.appendChild(script);
Instead, you can save this code in a Snippet and run it with a couple of button clicks, any time you need it. DevTools saves the Snippet to your file system.
To run a Snippet:
- Open the file via the Snippets pane, and click Run .
- Open the Command Menu, delete the
!, type the name of your Snippet, then press Enter.
See Run Snippets Of Code From Any Page to learn more.
Rather than using
the Chrome DevTools debugging tools, instead. The general idea is to set a breakpoint, which
is an intentional stopping place in your code, and then step through your code's execution,
one line at a time. As you step through the code, you can view and change the values of all
Set up a Workspace
By default, when you edit a file in the Sources panel, those changes are lost when you reload the page. Workspaces enable you to save the changes that you make in DevTools to your file system. Essentially, this lets you use DevTools as your code editor.
See Set Up Persistence With DevTools Workspaces to get started.