To access any hidden tabs of the Navigator pane, select ( More tabs). Select files, images, and other resources, and view their paths. Use the Navigator pane (on the left) to navigate among the resources that are returned from the server to construct the current webpage. To load the debugging demo webpage that's shown above, see The basic approach to using a debugger, below. See Change DevTools placement (Undock, Dock to bottom, Dock to left). To maximize the size of the Sources tool, undock DevTools into a separate window, and optionally move the DevTools window to a separate monitor. When DevTools is wide, the Debugger pane is placed on the right, and includes Scope and Watch: On the far left side is the main part of the browser window, showing the rendered webpage grayed-out because the debugger is paused on a breakpoint: The following figure shows the Navigator pane highlighted with a red box in the upper left corner of DevTools, the Editor pane highlighted in the upper right, and the Debugger pane highlighted on the bottom. Watch and manually change the values of variables that are in-scope for the current line of code. Use the JavaScript Debugger to set breakpoints, pause running JavaScript, and step through the code, including any edits you have made, while watching any JavaScript expressions you specify. When you use Workspaces or Overrides, you can edit HTML files as well. Your changes are preserved until you refresh the page, or are preserved after page refresh if you save to a local file with Workspaces. Make experimental edits to JavaScript or CSS. View JavaScript, HTML, CSS, and other files that are returned from the server. Optionally, set up a local Workspace to save changes directly to source files. Navigate among the resources that are returned from the server to construct the current webpage. The Navigator, Editor, and Debugger panes
Advantages of the debugger's Watch and Scope over console.log.
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Using the Debugger pane to debug JavaScript code.Displaying source files when using a different tool.Transformations from source code to compiled front-end code.Mapping minified code to your source code to show readable code.
Reformatting a minified JavaScript file with pretty-print.Using the Editor pane to view or edit files.Using the Snippets tab to run JavaScript code snippets on any webpage.Using the Content scripts tab for Microsoft Edge extensions.Using the Overrides tab to override server files with local files.Using the Filesystem tab to define a local Workspace.Using the Page tab to explore resources that construct the current webpage.Using the Navigator pane to select files.The Navigator, Editor, and Debugger panes.Use the Sources tool to view, modify, and debug front-end JavaScript code, and to inspect the resources that make up the current webpage.
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