# Unable to deploy Edge Function

If you're having trouble deploying an Edge Function, follow these steps to diagnose and resolve the issue.

## Diagnose the issue

1. **Check function syntax:** Run `deno check` on your function files locally
2. **Review dependencies:** Verify all imports are accessible and compatible with Deno
3. **Examine bundle size:** Large functions may fail to deploy

```bash
# Check for syntax errors
deno check ./supabase/functions/your-function/index.ts

# Deploy with verbose output
supabase functions deploy your-function --debug
```

## Common causes

- **Syntax errors:** TypeScript or JavaScript syntax issues in your function code
- **Invalid imports:** Importing modules that don't exist or aren't compatible with Deno
- **Large bundle size:** Functions have a maximum size of 20MB when bundled locally through the CLI, or 5MB when bundled server-side, for example through the Management API or Dashboard. See [Bundle size issues](./edge-function-bundle-size-issues) for more details
- **Network issues:** Problems reaching the Supabase API during deployment

## Before opening a support ticket

Make sure you're using the latest version of the Supabase CLI:

```bash
supabase --version
```

If it's out of date, upgrade using whichever package manager installed the CLI, for example `brew upgrade supabase`, `npm update supabase --save-dev`, or `scoop update supabase`.

If these steps don't resolve the issue, open a support ticket via the Supabase Dashboard and include all output from the diagnostic commands.

## Additional resources

- [Edge Functions guide](/docs/guides/functions)
- [Bundle size issues](./edge-function-bundle-size-issues)
- [Edge Function limits](/docs/guides/functions/limits)