# IResourceWithConnectionString.onConnectionStringAvailable

- Module: [Aspire.Hosting](/reference/api/typescript/aspire.hosting.md)
- Defined on: [IResourceWithConnectionString](/reference/api/typescript/aspire.hosting/iresourcewithconnectionstring.md)
- Version: `13.4.0`
- Kind: `method`

Subscribes to the ConnectionStringAvailable event.

## Definition

```typescript
interface IResourceWithConnectionString {
  // ... omitted for brevity
  onConnectionStringAvailable(callback: (arg: ConnectionStringAvailableEvent) => Promise<void>): IResourceWithConnectionString;
}
```

## Signature

```typescript
onConnectionStringAvailable(callback: (arg: ConnectionStringAvailableEvent) => Promise<void>): IResourceWithConnectionString
```

## Parameters

- `callback` (`(arg: ConnectionStringAvailableEvent) => Promise<void>`)

## Returns

[IResourceWithConnectionString](/reference/api/typescript/aspire.hosting/iresourcewithconnectionstring.md) `builder`

## Defined on

- [IResourceWithConnectionString](/reference/api/typescript/aspire.hosting/iresourcewithconnectionstring.md) -- `interface`