Open Source · backend

Use DeepSeek V2.5 with Express.js

Updated 2026-05-21 · By XALEN

How to use DeepSeek V2.5 (Open Source, 236B (21B active)) with Express.js. Install, authenticate, and make your first API call in minutes. Working code example included.

Model
DeepSeek V2.5
236B (21B active) · 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: 'deepseek-v2-5',
    messages: req.body.messages
  });
  res.json({ reply: response.choices[0].message.content });
});

app.listen(3000);

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Last updated: 2026-05-21