API Hover

API Hover: See API calls tied to UI interactions.

What it does

• Hover elements to see linked API calls
• Correlates clicks, submits, and Enter key interactions with fetch/XHR
• Session-only tracking (no persistence)

How it works

Main-world instrumentation captures fetch/XHR, a CSUI overlay renders hover tooltips, and a background tab store keeps correlation state across navigations.

Repo layout

• apps/extension: Plasmo MV3 extension
• apps/www: Landing page
• packages/core: Types and correlation helpers

Quick start

pnpm install
pnpm dev:extension
pnpm dev:www

Testing

pnpm --filter @api-hover/core test

Troubleshooting

GitHub CSP blocks the Plasmo HMR websocket. If you see CSP errors, use the production build instead of dev HMR.