Deploy nano-supabase as a serverless API on Val.town with persistent storage.

• Full PostgreSQL database running in WebAssembly
• Supabase-compatible query API
• Persistent storage using Val.town blob storage (data survives cold starts)
• CORS enabled for browser access

1. Go to val.town and create a new val
2. Copy the contents of index.ts into the editor
3. Important: Set the val type to HTTP using the dropdown near the val name
4. Your API is instantly live at https://YOUR_USERNAME-YOUR_VAL_NAME.web.val.run

# Install vt CLI
npm install -g @valtown/vt

# Login
vt login

# Create the val from this folder
cd examples/valtown
vt create my-chat-api . --no-editor-files --upload-if-exists --public

# IMPORTANT: After creating, go to the val's web page and set type to "HTTP"
# The CLI doesn't have an option to set the val type
vt browse

Use the included test script:

# Run the full test suite
./test.sh https://YOUR_USERNAME-YOUR_VAL_NAME.web.val.run

Or test manually:

# Get API info
curl https://YOUR_USERNAME-YOUR_VAL_NAME.web.val.run/

# Create a conversation
curl -X POST https://YOUR_USERNAME-YOUR_VAL_NAME.web.val.run/conversations \
  -H "Content-Type: application/json" \
  -d '{"title": "Test Chat"}'

# Add a message (replace YOUR_CONV_ID)
curl -X POST https://YOUR_USERNAME-YOUR_VAL_NAME.web.val.run/messages \
  -H "Content-Type: application/json" \
  -d '{"conversation_id": "YOUR_CONV_ID", "role": "user", "content": "Hello!"}'

# Get messages
curl "https://YOUR_USERNAME-YOUR_VAL_NAME.web.val.run/messages?conversation_id=YOUR_CONV_ID"

# Check stats
curl https://YOUR_USERNAME-YOUR_VAL_NAME.web.val.run/stats

This example includes built-in persistence using Val.town's blob storage. Data is automatically:

• Saved to blob storage after each write (POST) operation
• Restored from blob storage on cold start

The blob key is nano-supabase-chat-db. You can view/manage it in your Val.town dashboard.

The example uses a chat schema, but you can modify index.ts to:

• Add your own tables and schemas
• Implement different API endpoints
• Add authentication
• Connect to AI APIs for chat completions

"Not found" response: The val type isn't set to HTTP. Go to the val's page and change the type dropdown to "HTTP".

"Invalid version provided" error: This usually means there's a caching issue. Try:

1. Delete the val and create a new one with a different name
2. Clear Val.town's module cache by changing the import URL (add ?v=2)

Import errors: Make sure you're using the exact versions specified:

• PGlite: npm:@electric-sql/pglite@0.2.17
• nano-supabase: https://raw.githubusercontent.com/filipecabaco/nano-supabase/main/dist/index.js