---
agentTools:
  projectIndex: https://docs.rainway.com/llms.txt
---

# Web SDK - RainwayConnection.externalId

[Home](https://docs.rainway.com/reference/about) > [@rainway/web](web-sdk) > [RainwayConnection](./web-sdk-rainwayconnection) > [externalId](./web-sdk-rainwayconnection-externalid)

## RainwayConnection.externalId property

The optional user-specified string identifying the local peer.

<b>Signature:</b>

```typescript
get externalId(): string | undefined;
```