# Using NodeJS

#### Project Setup

```bash
mkdir lazai-inference
cd lazai-inference
npm init -y
```

#### Install Alith

```bash
npm i alith@latest
```

#### Create TypeScript Configuration

Create a file named `tsconfig.json` with the following content:

```json
{
  "compilerOptions": {
    "target": "ES2022",
    "module": "ESNext",
    "moduleResolution": "bundler",
    "allowSyntheticDefaultImports": true,
    "esModuleInterop": true,
    "allowJs": true,
    "strict": true,
    "skipLibCheck": true,
    "forceConsistentCasingInFileNames": true,
    "resolveJsonModule": true,
    "isolatedModules": true,
    "noEmit": true
  },
  "ts-node": {
    "esm": true
  },
  "include": ["*.ts"],
  "exclude": ["node_modules"]
}
```

#### Set Environment Variables

For OpenAI/ChatGPT API:

```bash
export PRIVATE_KEY=<your wallet private key>
export OPENAI_API_KEY=<your openai api key>
```

For other OpenAI-compatible APIs (DeepSeek, Gemini, etc.):

```bash
export PRIVATE_KEY=<your wallet private key>
export LLM_API_KEY=<your api key>
export LLM_BASE_URL=<your api base url>
```

#### Step 1: Request Inference via LazAI Client

Create a file named `app.ts` with the following content:

```typescript
import { ChainConfig, Client } from "alith/lazai";
import { Agent } from "alith";
 
// Set up the private key for authentication
process.env.PRIVATE_KEY = "<your wallet private key>";
 
const node = "0xc3e98E8A9aACFc9ff7578C2F3BA48CA4477Ecf49"; // Replace with your own inference node address
const client = new Client(ChainConfig.testnet());
 
await client.getUser(client.getWallet().address);
 
console.log(
  "The inference account of user is",
  await client.getInferenceAccount(client.getWallet().address, node)
);
 
const fileId = 10;
const nodeInfo = await client.getInferenceNode(node);
const url = nodeInfo.url;
const agent = new Agent({
  // OpenAI-compatible inference server URL
  baseUrl: `${url}/v1`,
  model: "gpt-3.5-turbo",
  // Extra headers for settlement and DAT file anchoring
  extraHeaders: await client.getRequestHeaders(node, BigInt(fileId)),
});
console.log(await agent.prompt("What is Alith?"));
```

#### Step 2: Run the Application

```bash
npx tsx app.ts
```