turso/examples/javascript/database-wasm-vite/README.md

database-wasm-vite

This is a minimal example showing how to use @tursodatabase/database-wasm in the browser with Vite.

---

Usage

npm install
npm run dev
# or build assets and serve them with simple node.js server
npm run build
npm run serve

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Important: COOP / COEP Headers

Because @tursodatabase/database-wasm relies on SharedArrayBuffer, you need Cross-Origin headers in development and production:

Vite dev server config (vite.config.js)

import { defineConfig } from 'vite'

export default defineConfig({
  server: {
    headers: {
      'Cross-Origin-Opener-Policy': 'same-origin',
      'Cross-Origin-Embedder-Policy': 'require-corp',
    }
  }
})

Static production server (server.mjs)

When serving the dist/ build, also make sure your server sets these headers:

res.setHeader("Cross-Origin-Opener-Policy", "same-origin");
res.setHeader("Cross-Origin-Embedder-Policy", "require-corp");

Vercel deployment

If you deploy to Vercel, add a vercel.json file to ensure COOP / COEP headers are set:

{
  "headers": [
    {
      "source": "/(.*)",
      "headers": [
        { "key": "Cross-Origin-Opener-Policy", "value": "same-origin" },
        { "key": "Cross-Origin-Embedder-Policy", "value": "require-corp" }
      ]
    }
  ]
}