> For the complete documentation index, see [llms.txt](https://docs.transferchain.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.transferchain.io/blockchain-read-node/websocket-client/javascript.md).

# Javascript

TransferChain Fastest Read Network WebSocket Client\
Read Node Address: <https://read-node-01.transferchain.io> \
Read Node WebSocket Address: wss\://read-node-01.transferchain.io/ws

### Networks

* medusa - v2

### Installation

```bash
$ npm i @tchain/tcabci-read-js-client
```

### Example

**Subscribe, Listen and Unsubscribe Example**

```javascript
import TCaBCIClient from '@tchain/tcabci-read-js-client'

const client = new TCaBCIClient()
// OR
const client = new TCaBCIClient([
  'https://read-node-01.transferchain.io',
  'wss://read-node-01.transferchain.io/ws',
])
// OR
// With addresses and WebSocket library and network name, version
const client = new TCaBCIClient(
  [
    'https://read-node-01.transferchain.io',
    'wss://read-node-01.transferchain.io/ws',
  ],
  WebSocket,
  'transferchain',
  'v1',
)

client.Start()

client.Subscribe(['<your-public-address-one>', '<your-public-address-two>'])

client.SetListenCallback(() => {
  // If a transaction has been sent to your addresses, the callback you set here will be called.
})

client.SetErrorCallback(() => {
  // If network errors will be called.
})

client.SetCloseCallback(() => {
  // If server side close will be called.
})

client.Unsubscribe()
client.Stop()
```


---

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