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

# Make api request sonic3 bytes javascript steps

<>
  <Step title="API を呼び出す">
    ```js lines theme={null}
    import { CartesiaClient } from "@cartesia/cartesia-js";
    import fs from "node:fs";
    import { spawn } from "node:child_process";
    import process from "node:process";

    if (!process.env.CARTESIA_API_KEY) {
      throw new Error("CARTESIA_API_KEY is not set");
    }

    // Set up the client.
    const client = new CartesiaClient({
      apiKey: process.env.CARTESIA_API_KEY,
    });

    // Make the API call.
    const response = await client.tts.bytes({
      modelId: "sonic-3.5",
      // You can find more voices at https://play.cartesia.ai/voices
      voice: {
        mode: "id",
        id: "694f9389-aac1-45b6-b726-9d9369183238",
      },
      // You can find the supported `output_format`s at https://docs.cartesia.ai/api-reference/tts/bytes
      outputFormat: {
        container: "wav",
        encoding: "pcm_s16le",
        sampleRate: 44100,
      },
      transcript: "Welcome to Cartesia Sonic!",
    });

    // Write `response` to a file. (We convert the response to a Uint8Array first.)
    fs.writeFileSync("sonic-3.wav", await new Response(response).bytes());

    // Play the file.
    spawn("ffplay", ["-autoexit", "-nodisp", "sonic-3.wav"]);
    ```
  </Step>

  <Step title="スクリプトを実行する">
    ```sh lines theme={null}
    env CARTESIA_API_KEY=YOUR_API_KEY node hello.js
    ```

    Cartesia API クライアントは、Bun や Deno などの他のランタイムにも対応しています。
  </Step>
</>