Local Qwen 3.5 Adds an Express API and SQLite to Make an App Full-Stack

Melvin Vivas · X post · 2026-03-08 · Open on X

Topics: AI Dev Tools & Productivity, Portfolio Projects · Level: intermediate

Summary

The creator asked a locally running Qwen 3.5 to add an Express API server that saves data to SQLite. The model did it and turned the app into a full-stack app.

Key points

• Local Qwen 3.5 handled a multi-step backend task: adding an Express API server and SQLite storage.
• The frontend-only app became full-stack.
• This is a useful benchmark task for testing local coding models.

Resources mentioned

• Qwen 3.5 · tool · qwen.ai · free
  Alibaba Qwen open model family with small on-device variants and toggleable reasoning.
  Also in: Workshop AI: Building Apps with Cloud and Local Agents (GLM 5, Qwen 3.5) (Melvin Vivas on X · notes), Qwen3.5 0.8B Does Real-Time Local Video Captioning (Melvin Vivas on X · notes), Qwen3.5 0.8B Real-Time Video Captioning on Mac Studio (Melvin Vivas on X · notes), Qwen 3.5 Is the Local Model That Holds Up in Claude Code (Melvin Vivas on X · notes) and 7 more
• Express · tool · expressjs.com · free
  A minimal Node.js web framework for building APIs.
• SQLite · tool · sqlite.org · free
  A lightweight embedded SQL database stored in a file.
  Also in: Why Plan Mode Still Matters in AI Coding Agents (Codex, Claude, Cursor) (Melvin Vivas on X · notes), Running Qwen3.8-27B EXL3 Locally on an RTX 3090 with 220K+ Context (Melvin Vivas on X · notes), One-Shotting a Slack Clone with Fable 5 (Melvin Vivas on X · notes), Google Antigravity 2.0: Multi-Agent Desktop App Walkthrough (Subagents, Scheduled Tasks) (Melvin Vivas on X · notes)

Try this

• Ask a local coding model to turn a frontend app into a full-stack app with Express and SQLite