SPARQL Studio

SPARQL Studio is a local-first web app for querying Virtuoso over SPARQL.
It uses a minimal browser extension bridge so developers can query localhost without changing Virtuoso server settings.

Workspace

• apps/web: React + Vite app
• apps/bridge-extension: Manifest V3 bridge extension
• packages/contracts: Shared message and SPARQL result contracts

Run the app

1. Install dependencies:

   npm install

2. Start web app:

   npm run dev --workspace web

3. Load extension in Chrome:

   • open chrome://extensions
   • enable Developer mode
   • click Load unpacked
   • select apps/bridge-extension

4. In SPARQL Studio settings, paste the extension ID and set your endpoint (default http://localhost:8890/sparql).

Current features

• SPARQL editor powered by sparql-editor
• Saved queries (IndexedDB)
• Query history (IndexedDB)
• Global prefix library and prefix injection
• Results table with URI click-through and alt-click drill-down query
• CSV export
• Bridge health check and query execution timeout support

Tests and checks

npm run test --workspace web
npm run lint --workspace web
npm run build --workspace web