Visual Studio Code is highly recommended due to its excellent UXP and JavaScript ecosystem support. Step 2: Enable Developer Mode
The hot reload capability is UDT’s killer feature. It ensures that when you save a change to your JavaScript, HTML, or CSS file, the plugin's user interface is updated instantly in the host application—such as Photoshop, InDesign, or Premiere Pro—without requiring a manual rebuild or a reload of the plugin. This capability eliminates the tedious step of repeatedly unloading and loading your plugin during development.
"development": "reload": true, "devtools": true
Before diving into Hot Reload, it is essential to understand the Unified Extensibility Platform (UXP) architecture. Unlike the legacy CEP (Common Extensibility Platform) which relied on an embedded, heavy Chromium instance alongside a Node.js runtime, UXP executes directly within the native host application layer.
Open your host application (e.g., Photoshop) and navigate to > Plugins . Check the box for Enable Developer Mode . Step 2: Connect the UXP Developer Tool Launch the Adobe UXP Developer Tool . adobe uxp developer tool hot
In May 2026, Adobe announced a significant update to the backend infrastructure for UXP plugins in Photoshop. This update, available in Photoshop Beta build 27.8, ensures a for UXP plugins across Creative Cloud applications and lays the groundwork for future UI enhancements and shared capabilities . While not expected to cause major visual changes, developers are encouraged to report any discrepancies they encounter.
Leo was part of a closed community called "The Extensionists." Every Friday, they hosted a virtual "Hack & Hang." But this wasn't a typical Discord voice chat. Using a custom UXP-based streaming tool he had built, ten developers across the world shared their screens inside a single, shared virtual workspace.
| Feature | CEP Developer Experience | UDT Developer Experience | | :--- | :--- | :--- | | | evalScript string marshaling | Direct, native API calls | | JavaScript | ExtendScript (ES3‑ish) | Modern JavaScript (ES2018+) | | Debugging | alert() or console.log() | Chrome DevTools‑style debugger | | UI Look & Feel | HTML/CSS (often custom) | Spectrum Web Components for native Adobe UI | | Performance | Webview overhead + IPC round‑trips | Lightweight, sandboxed runtime | | Security & Sandboxing | Limited isolation | OS‑level sandboxing with granular permissions | | Hot Reload | Not available | Yes, a core feature | | Cross‑platform | Separate builds often required | Fully cross‑platform by design |
For developers starting from scratch, UDT offers a built-in scaffolding assistant. Instead of manually structuring folders and manifest definitions, you can generate clean starter templates for React, vanilla JavaScript, or basic panel layouts natively through the UI. Step-by-Step Workflow: From Setup to Debugging Visual Studio Code is highly recommended due to
Click next to your plugin name. Instantly, your plugin panel will pop open inside Photoshop. Immediately click Watch . Now, your workspace is dynamic. You can split your monitor screens: VS Code on the left, Photoshop on the right, and UDT running in the background. Step 4: The Deep Debug
The is the official integrated development environment from Adobe for creating, loading, managing, and debugging plugins and scripts that run on the Unified Extensibility Platform (UXP) . It is the successor to the older CEP (Common Extensibility Platform) tooling, designed to address the performance, security, and modern developer experience gaps of previous generations. The tool is available for Windows and macOS and can be installed directly from the Creative Cloud Desktop application.
Your UXP plugin requires a correctly structured manifest.json file. For development purposes, you must ensure that your host configuration allows for debugging. A baseline manifest structure looks like this:
In UDT, look at the list. Your running app should display a green status dot. If it does not, click the refresh icon or restart the application. Activating the "Hot" Developer Workflow This capability eliminates the tedious step of repeatedly
To "generate a report" using UXP, developers typically write scripts that interact with the host application's data and the local file system: Adobe UXP: Things you need to know! #3 UXP Developer Tool
The "hot" aspect of the UXP Developer Tool—often referred to as or automatic reloading —removes this friction. When you enable "Watch" in the UDT, the tool monitors your source folder for changes 1.2.2. Benefits of Hot Reloading in UDT
Which are you targeting (Photoshop, InDesign, Premiere Pro)? Are you using plain JavaScript or a framework like React ?
Unlike the old days of CEP (Common Extensibility Platform), UXP was lean. It was built on modern web standards. He could use React, Vue, or even vanilla JS. The real lifestyle perk, however, was where he could write the code. He wrote a complex state management script while riding the cable car up to Montjuïc. The UXP simulator on his tablet let him test UI interactions without even opening Adobe XD.