Architecture
System diagram, data model, and invariants you must not break. Read →
Tina Diet Docs
AI nutrition coach for Thailand, built on LINE LIFF + Express + Cloudflare.
What is this?
Developer documentation for Tina Diet at tinadiet.com. Covers how the
system is built, how to set up local development, how to deploy, and how to
operate it in production.
End-user help lives inside the LIFF app at app.tinadiet.com/support — this
site is for engineering.
Find your way around
Local setup
Clone, install, run backend + LIFF locally with cloudflared tunnel. Read →
Backend
Express + better-sqlite3 + LINE SDK + OpenAI + Omise. Lazy stmts pattern. Read →
LIFF
Vite + React + Tailwind + multi-page routing in LINE’s webview. Read →
Payments
Omise PromptPay + TrueMoney manual-renew model, HMAC signature verify. Read →
Operations
DB queries, manual grants, troubleshooting, monitoring. Read →
Project at a glance
- Brand: Tina Diet — Thai-first nutrition coach with a friendly female persona (ค่ะ register)
- Surface: LINE chat bot (Messaging API) + LIFF SPA (LINE-embedded React app)
- Backend: Node 22 / Express / TypeScript ESM / better-sqlite3 on a Railway volume
- AI: OpenAI gpt-4o (vision) + gpt-4o-mini (text) for food parsing, coaching, consultation
- Payments: Omise PromptPay + TrueMoney, 150 THB / 30 days, manual renewal
- Hosting: Railway (backend) · Cloudflare Workers (LIFF) · Cloudflare Pages (these docs)