Speech · language

Use AssemblyAI Universal 2 with JavaScript

Updated 2026-05-21 · By XALEN

How to use AssemblyAI Universal 2 (Speech, ~2B) with JavaScript. Install, authenticate, and make your first API call in minutes. Working code example included.

Model

AssemblyAI Universal 2

~2B · Long-form context · $0.006/min input

Framework

JavaScript

language · npm install xalen-sdk

1. Install

npm install xalen-sdk

2. Code

import XALEN from 'xalen-sdk';

const client = new XALEN({ apiKey: 'xln_test_YOUR_KEY' });

const response = await client.chat.completions.create({
  model: 'assembly-ai-universal-2',
  messages: [{ role: 'user', content: 'Hello from JavaScript!' }]
});
console.log(response.choices[0].message.content);

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Last updated: 2026-05-21