A Chrome extension that automatically generates exception-handling expressions for Power Automate cloud flows. Click the extension icon while editing a flow, and the generated expression is copied to your clipboard — ready to paste into a Compose or Variable action inside your exception scope.

For more information visit powerdevbox.com/exception

• One-click expression generation — Reads the flow definition via the Dataverse API, identifies all containers (Scope, If, Switch, ForEach, Until), and builds an XPath-based expression that extracts the first meaningful error message.
• Advanced Mode — Toggle with Ctrl + M to include individual API connector action outputs in the expression for deeper diagnostics.
• Flow run link shortcut — Press Ctrl + E to copy a dynamic flow-run URL expression to your clipboard.
• Token management — Automatically captures the Dataverse bearer token from browser requests, persists it across service-worker restarts, and monitors expiry with a badge indicator.

1. Download or clone this repository.
2. Open chrome://extensions in Chrome (or any Chromium-based browser).
3. Enable Developer mode.
4. Click Load unpacked and select the repository folder.
5. Navigate to a Power Automate cloud flow in edit mode.

1. Open a cloud flow in the Power Automate designer and save (the extension reads the last-saved definition).
2. Click the Power DevBox Exceptions extension icon.
3. The exception expression is generated and copied to your clipboard.
4. Paste the expression into a Compose or Variable action inside your exception-handling scope.

1. Token capture — A webRequest.onBeforeSendHeaders listener intercepts requests to *.dynamics.com, extracts the Authorization header, parses the JWT expiry, and stores the token.
2. Flow parsing — When the icon is clicked, the extension fetches the flow's clientdata from the Dataverse API, parses the workflow definition, and recursively walks all actions to find containers (Scope, If, Switch, ForEach, Until).
3. Expression building — Containers are assembled into a concat(…) expression wrapped in json(…) → xml(…) → xpath(…) to extract the first actionable error message, filtering out generic "action failed" and "template skipped" noise.
4. Clipboard — The final expression is sent to the content script which writes it to the clipboard and displays a confirmation popup.

manifest.json            # Chrome Extension manifest (v3)
background.js            # Service worker — token management, API calls, expression logic
background.min.js        # Minified background script
content.js               # Content script — clipboard, popups, keyboard shortcuts
content.min.js           # Minified content script

David Wyatt — LinkedIn · Power DevBox

See repository for license details.