Open Source · backend

Use DeepSeek V3 with Express.js

Updated 2026-05-21 · By XALEN

How to use DeepSeek V3 (Open Source, 671B (37B active)) with Express.js. Install, authenticate, and make your first API call in minutes. Working code example included.

Model

DeepSeek V3

671B (37B active) · 128K context · $0.05 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-v3',
    messages: req.body.messages
  });
  res.json({ reply: response.choices[0].message.content });
});

app.listen(3000);

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Last updated: 2026-05-21