Anam + Cartesia

npm install express @anam-ai/js-sdk

{
  "type": "module"
}

import express from "express";

const app = express();
app.use(express.json());

const requiredEnvVars = ["ANAM_API_KEY"];

for (const name of requiredEnvVars) {
  if (!process.env[name]) {
    throw new Error(`${name} is required`);
  }
}

// Swap these for another avatar, Cartesia voice, or LLM from Anam Lab.
const avatarId = "071b0286-4cce-4808-bee2-e642f1062de3"; // Liv
const voiceId = "c48c4dd9-5050-11f1-9076-5e955d484d11"; // Siobhan - Warm Welcomer
const llmId = "a7cf662c-2ace-4de1-a21e-ef0fbf144bb7"; // GPT OSS 120B

app.post("/api/anam-session", async (req, res) => {
  const sessionTokenResponse = await fetch("https://api.anam.ai/v1/auth/session-token", {
    method: "POST",
    headers: {
      Authorization: `Bearer ${process.env.ANAM_API_KEY}`,
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
      personaConfig: {
        name: "Cartesia voice avatar",
        avatarId,
        voiceId,
        llmId,
        systemPrompt: "You are a concise voice assistant. Keep responses brief.",
        voiceGenerationOptions: {
          speed: 1,
          volume: 1,
          emotion: "content",
        },
      },
    }),
  });

  if (!sessionTokenResponse.ok) {
    const errorBody = await sessionTokenResponse.text();
    return res.status(502).json({
      error: "Failed to create Anam session token",
      detail: errorBody,
    });
  }

  const session = await sessionTokenResponse.json();
  return res.json(session); // { sessionToken }
});

app.listen(3000);

curl "https://api.anam.ai/v1/voices?perPage=100&search=voice-name" \
  -H "Authorization: Bearer $ANAM_API_KEY"

<video id="anam-video" autoplay playsinline></video>
<button id="start-avatar" type="button">Start avatar</button>

import { createClient } from "@anam-ai/js-sdk";

let anamClient: ReturnType<typeof createClient> | undefined;

async function startAvatar() {
  const response = await fetch("/api/anam-session", { method: "POST" });

  if (!response.ok) {
    throw new Error("Failed to create Anam session");
  }

  const { sessionToken } = await response.json();
  anamClient = createClient(sessionToken);

  await anamClient.streamToVideoElement("anam-video");
}

document.querySelector<HTMLButtonElement>("#start-avatar")?.addEventListener("click", () => {
  startAvatar().catch((error) => {
    console.error(error);
  });
});