uxp uninstall MyAppPackageName

Official Microsoft Docs: Create, test, and debug a UWP app with the UXP tool

It is not a general-purpose Windows tool. It is the essential companion for developers building modern Windows apps using:

Easily load, unload, and watch plugins under active development.

When a developer selects a loaded plugin within UDT and initiates a debug session, the tool spins up a dedicated Node.js server and opens a debugging port. This allows the developer to inspect the DOM, monitor console logs, and step through JavaScript execution using the familiar interface of Chrome DevTools. By decoupling the debugging environment from the host application, UDT provides a level of stability and performance that was difficult to achieve previously. It treats the plugin as a distinct, inspectable process, acknowledging that modern development requires professional-grade inspection tools to ensure code quality.

uxp validate C:\MyApp.msix