Prompt XML Studio

A private, local-first editor for turning unstructured prompts into clean XML documents. It is the modern replacement for the original two-file Claude Prompt XML Helper.

Live app: xmlprompt.carterlasalle.com

What changed in 2.0

• Rebuilt the interface as a responsive three-panel workspace.
• Added live XML generation and validation instead of a manual generate step.
• Added prompt templates for general prompting, summarization, extraction, code review, and research synthesis.
• Added drag-and-drop and keyboard-accessible section ordering.
• Added CDATA and escaped-text output modes, indentation controls, optional XML declarations, and fragment output.
• Added local persistence, dark mode, keyboard shortcuts, clipboard fallback, and safer downloads.
• Removed alerts, inline scripts, external assets, analytics, and all network requests.
• Added a tested generation engine, static integrity checks, and GitHub Actions CI.
• Added a real MIT license and installable web-app metadata.

Privacy model

The app runs entirely in the browser. Prompt content is stored only in localStorage on the current device. There are no API calls, analytics requests, accounts, cookies, or server-side prompt storage.

Run locally

This project uses Yarn and requires Node.js 22 or newer.

corepack enable
yarn dev

Open http://127.0.0.1:4173.

To expose the development server to other devices on your network:

yarn dev --host=0.0.0.0 --port=4173

Validate the project

yarn check

That command runs dependency-free static integrity checks and the Node test suite.

Project structure

.
├── index.html                 # Accessible application shell
├── styles.css                # Responsive light/dark design system
├── src/
│   ├── app.js                # Browser state and interactions
│   └── prompt-xml.js         # Pure XML generation and validation engine
├── tests/
│   └── prompt-xml.test.mjs   # Node test suite
├── scripts/
│   ├── check.mjs             # Static integrity and privacy checks
│   └── dev.mjs               # Dependency-free local server
└── .github/workflows/ci.yml  # Yarn-based CI

XML behavior

Prompt XML Studio validates root and section tag names before producing output. Content can be emitted in either of two modes:

• CDATA: best when prompt content contains code, angle brackets, or XML-like examples. Embedded ]]> sequences are split safely.
• Escaped text: converts &, <, and > to XML entities.

A root tag is optional. Clearing it produces an XML fragment containing the configured prompt sections.

Keyboard shortcuts

• Cmd/Ctrl + Enter: copy the current XML.
• Cmd/Ctrl + Shift + K: add a new section.

Deployment

The app is static and requires no build command. Serve the repository root from any static host. The existing custom domain can continue serving index.html directly.

License

MIT © Carter LaSalle