> ## Documentation Index
> Fetch the complete documentation index at: https://docs.polynode.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# TypeScript Configuration

> Configure PolyNode TypeScript endpoints, timeouts, reconnects, replay buffers, and integrity behavior.

The default public endpoints are already configured. Override them only when PolyNode gives you a different endpoint.

```typescript theme={null}
import { PolyNode } from 'polynode-sdk';

const apiKey = process.env.POLYNODE_API_KEY;
if (!apiKey) throw new Error('Set POLYNODE_API_KEY');

const pn = new PolyNode({
  apiKey,
  baseUrl: 'https://api.polynode.dev',
  v3BaseUrl: 'https://api.polynode.dev',
  wsUrl: 'wss://ws.polynode.dev/ws',
  obUrl: 'wss://ob.polynode.dev/ws',
  rpcUrl: 'https://rpc.polynode.dev',
  timeout: 10_000,
});
```

Configure a stream before its first connection:

```typescript theme={null}
const events = pn.configureWs({
  compress: true,
  autoReconnect: true,
  maxReconnectAttempts: Infinity,
  reconnectBaseDelay: 1_000,
  reconnectMaxDelay: 30_000,
  subscribeTimeoutMs: 30_000,
  subscriptionQueueCapacity: 4_096,
  dedupeCapacity: 4_096,
  replayOverlapMs: 1,
});

const orderbook = pn.configureOrderbook({
  compress: true,
  autoReconnect: true,
  integrity: true,
  allowStaleReads: false,
});

const perps = pn.configurePerps({
  autoReconnect: true,
  operationTimeoutMs: 30_000,
  queueCapacity: 4_096,
});
```

Event and perps queues are bounded. Choose capacities for your processing rate, observe overflow callbacks, and move slow work away from message handlers. A larger buffer delays loss but is not a substitute for sustained consumer throughput.

API keys belong in server-side environment variables or a secret manager, never a browser bundle.