Open Source · backend

Use Yi Lightning with Express.js

Updated 2026-05-21 · By XALEN

How to use Yi Lightning (Open Source, 200B MoE) with Express.js. Install, authenticate, and make your first API call in minutes. Working code example included.

Model

Yi Lightning

200B MoE · 128K context · $0.04 input

Framework

Express.js

backend · npm install xalen-sdk express

1. Install

npm install xalen-sdk express

2. Code

const express = require('express');
const XALEN = require('xalen-sdk');

const app = express();
app.use(express.json());
const client = new XALEN({ apiKey: 'xln_test_YOUR_KEY' });

app.post('/chat', async (req, res) => {
  const response = await client.chat.completions.create({
    model: 'yi-lightning',
    messages: req.body.messages
  });
  res.json({ reply: response.choices[0].message.content });
});

app.listen(3000);

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Last updated: 2026-05-21