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

# Quickstart

> We have prepared commonly used SDK tools for developers.

Explore BlockRush JavaScript/TypeScript JSON-RPC SDK, a high-performance library designed for Node.js and browser environments to interact with BlockRush infrastructure on Solana.

## Download

* [blockrush-nodejs-sdk-0.0.2.tgz](https://zero402-public.s3.ap-southeast-1.amazonaws.com/static/sdk/blockrush-nodejs-sdk-0.0.2.tgz)

## Environment

Node.js 20+, modern browsers (supporting fetch/AbortController)

## Security Recommendations

Do not hardcode production API Keys in the browser. Use backend-issued short-term tokens or proxy forwarding for client-side applications.

## Quick Start

```javascript theme={null}
import { BlockrushSDK, Region } from "@blockrush/sdk";

// Initialize SDK with your API key and preferred region
const sdk = new BlockrushSDK({
  region: Region.JP,
  api_key: "YOUR_API_KEY", // Use environment variables in production
});

// Example: Send a single transaction
const res = await sdk.send_transaction(
  "Base64 string of fully signed transaction"
);
console.log(res);

// Example: Submit batch transactions
const res2 = await sdk.submit_batch([
  "Base64 string of fully signed transaction 1",
  "Base64 string of fully signed transaction 2",
]);
console.log(res2);

// Clean up resources when done
sdk.destroy();
```