Chrome DevTools: Build Custom Tools with JavaScript

Developers working on modern applications know that the hard part is rarely inspecting the DOM or reading network requests. Real friction occurs when trying to understand and manipulate highly specific internal application states.

In these scenarios, generic tools like the Console, Network, or Application tabs often force workaround solutions such as hastily pasted scripts, repeated navigation, login forms, page refreshes, and trial-and-error attempts. A more effective approach is bringing essential commands directly into Chrome DevTools.

Stock photo for illustration only, not from the actual event

Creating small, dedicated control panels that communicate directly with the app helps open up the black box of application state, turning expensive control points into immediate actions. One of the most common scenarios is testing permissions and UI variants for different roles such as admins, editors, viewers, or support staff.

• Opening a fresh login screen for every role switch.
• Manually toggling user accounts to verify interface rendering.
• Checking menu limitations based on assigned access rights.

An integrated impersonation tool inside DevTools flips this approach. Instead of manually driving the application, developers can execute a direct action to modify the user context on the fly using just a few short JavaScript snippets.

Source: Dev.to