TanStack Start on Cloudflare

Build a complete full-stack app from nothing. Claude generates every file — no template clone, no scaffold command.

Stack: TanStack Start v1 (SSR, file-based routing, server functions via Nitro) on Cloudflare Workers; React 19 + Tailwind v4 + shadcn/ui; D1 + Drizzle; better-auth (Google OAuth + email/password).

Project File Tree

PROJECT_NAME/
├── src/
│   ├── routes/
│   │   ├── __root.tsx              # Root layout (HTML shell, theme, CSS import)
│   │   ├── index.tsx               # Landing / auth redirect
│   │   ├── login.tsx               # Login page
│   │   ├── register.tsx            # Register page
│   │   ├── _authed.tsx             # Auth guard layout route
│   │   ├── _authed/
│   │   │   ├── dashboard.tsx       # Dashboard with stat cards
│   │   │   ├── items.tsx           # Items list table
│   │   │   ├── items.$id.tsx       # Edit item
│   │   │   └── items.new.tsx       # Create item
│   │   └── api/
│   │       └── auth/
│   │           └── $.ts            # better-auth API catch-all
│   ├── components/
│   │   ├── ui/                     # shadcn/ui components (auto-installed)
│   │   ├── app-sidebar.tsx         # Navigation sidebar
│   │   ├── theme-toggle.tsx        # Light/dark/system toggle
│   │   ├── user-nav.tsx            # User dropdown menu
│   │   └── stat-card.tsx           # Dashboard stat card
│   ├── db/
│   │   ├── schema.ts               # Drizzle schema (all tables)
│   │   └── index.ts                # Drizzle client factory
│   ├── lib/
│   │   ├── auth.server.ts          # better-auth server config
│   │   ├── auth.client.ts          # better-auth React hooks
│   │   └── utils.ts                # cn() helper for shadcn/ui
│   ├── server/
│   │   └── functions.ts            # Server functions (CRUD, auth checks)
│   ├── styles/
│   │   └── app.css                 # Tailwind v4 + shadcn/ui CSS variables
│   ├── router.tsx                  # TanStack Router configuration
│   ├── client.tsx                  # Client entry (hydrateRoot)
│   ├── ssr.tsx                     # SSR entry
│   └── routeTree.gen.ts            # Auto-generated route tree (do not edit)
├── drizzle/                        # Generated migrations
├── public/                         # Static assets (favicon, etc.)
├── vite.config.ts
├── wrangler.jsonc
├── drizzle.config.ts
├── tsconfig.json
├── package.json
├── .dev.vars                       # Local env vars (NOT committed)
└── .gitignore

Dependencies

Runtime:

{
  "react": "^19.0.0",
  "react-dom": "^19.0.0",
  "@tanstack/react-router": "^1.120.0",
  "@tanstack/react-start": "^1.120.0",
  "drizzle-orm": "^0.38.0",
  "better-auth": "^1.2.0",
  "zod": "^3.24.0",
  "class-variance-authority": "^0.7.0",
  "clsx": "^2.1.0",
  "tailwind-merge": "^3.0.0",
  "lucide-react": "^0.480.0"
}

Dev:

{
  "@cloudflare/vite-plugin": "^1.0.0",
  "@tailwindcss/vite": "^4.0.0",
  "@vitejs/plugin-react": "^4.4.0",
  "tailwindcss": "^4.0.0",
  "typescript": "^5.7.0",
  "drizzle-kit": "^0.30.0",
  "wrangler": "^4.0.0",
  "tw-animate-css": "^1.2.0"
}

Scripts:

{
  "dev": "vite",
  "build": "vite build",
  "preview": "vite preview",
  "deploy": "wrangler deploy",
  "db:generate": "drizzle-kit generate",
  "db:migrate:local": "wrangler d1 migrations apply PROJECT_NAME-db --local",
  "db:migrate:remote": "wrangler d1 migrations apply PROJECT_NAME-db --remote"
}

Workflow

Step 1: Gather Project Info

Step 2: Initialise Project

Create the project directory and all config files from scratch.

vite.config.ts — Plugin order matters. Cloudflare MUST be first:

import { defineConfig } from "vite";
import { cloudflare } from "@cloudflare/vite-plugin";
import { tanstackStart } from "@tanstack/react-start/plugin/vite";
import tailwindcss from "@tailwindcss/vite";
import viteReact from "@vitejs/plugin-react";

export default defineConfig({
  plugins: [
    cloudflare({ viteEnvironment: { name: "ssr" } }),
    tailwindcss(),
    tanstackStart(),
    viteReact(),
  ],
});

wrangler.jsonc:

{
  "$schema": "node_modules/wrangler/config-schema.json",
  "name": "PROJECT_NAME",
  "compatibility_date": "2025-04-01",
  "compatibility_flags": ["nodejs_compat"],
  "main": "@tanstack/react-start/server-entry",
  "account_id": "ACCOUNT_ID",
  "d1_databases": [
    {
      "binding": "DB",
      "database_name": "PROJECT_NAME-db",
      "database_id": "DATABASE_ID",
      "migrations_dir": "drizzle"
    }
  ]
}

Key points: main MUST be "@tanstack/react-start/server-entry" (Nitro server entry). Use nodejs_compat (NOT node_compat). Add account_id to avoid interactive prompts.

tsconfig.json:

{
  "compilerOptions": {
    "target": "ES2022",
    "module": "ESNext",
    "moduleResolution": "bundler",
    "jsx": "react-jsx",
    "strict": true,
    "skipLibCheck": true,
    "esModuleInterop": true,
    "resolveJsonModule": true,
    "isolatedModules": true,
    "noEmit": true,
    "paths": { "@/*": ["./src/*"] },
    "types": ["@cloudflare/workers-types/2023-07-01"]
  },
  "include": ["src/**/*", "vite.config.ts"]
}

.dev.vars — generate BETTER_AUTH_SECRET with openssl rand -hex 32:

BETTER_AUTH_SECRET=<generated-hex-32>
BETTER_AUTH_URL=http://localhost:3000
TRUSTED_ORIGINS=http://localhost:3000
# GOOGLE_CLIENT_ID=
# GOOGLE_CLIENT_SECRET=

.gitignore — node_modules, .wrangler, dist, .output, .dev.vars, .vinxi, .DS_Store

Then install and create the D1 database:

cd PROJECT_NAME && pnpm install
npx wrangler d1 create PROJECT_NAME-db
# Copy the database_id into wrangler.jsonc d1_databases binding

Step 3: Database Schema

src/db/schema.ts — All tables. better-auth requires: users, sessions, accounts, verifications. Add application tables (e.g. items) for CRUD demo.

D1-specific rules:

• Use integer for timestamps (Unix epoch), NOT Date objects
• Use text for primary keys (nanoid/cuid2), NOT autoincrement
• Keep bound parameters under 100 per query (batch large inserts)
• Foreign keys are always ON in D1

src/db/index.ts — Drizzle client factory:

import { drizzle } from "drizzle-orm/d1";
import { env } from "cloudflare:workers";
import * as schema from "./schema";

export function getDb() {
  return drizzle(env.DB, { schema });
}

CRITICAL: Use import { env } from "cloudflare:workers" — NOT process.env. Create the Drizzle client inside each server function (per-request), not at module level.

drizzle.config.ts:

import { defineConfig } from "drizzle-kit";

export default defineConfig({
  schema: "./src/db/schema.ts",
  out: "./drizzle",
  dialect: "sqlite",
});

Generate and apply the initial migration:

pnpm db:generate
pnpm db:migrate:local

Step 4: Configure Auth

src/lib/auth.server.ts — Server-side better-auth:

import { betterAuth } from "better-auth";
import { drizzleAdapter } from "better-auth/adapters/drizzle";
import { drizzle } from "drizzle-orm/d1";
import { env } from "cloudflare:workers";
import * as schema from "../db/schema";

export function getAuth() {
  const db = drizzle(env.DB, { schema });
  return betterAuth({
    database: drizzleAdapter(db, { provider: "sqlite" }),
    secret: env.BETTER_AUTH_SECRET,
    baseURL: env.BETTER_AUTH_URL,
    trustedOrigins: env.TRUSTED_ORIGINS?.split(",") ?? [],
    emailAndPassword: { enabled: true },
    socialProviders: {
      // Add Google OAuth if credentials provided
    },
  });
}

CRITICAL: getAuth() must be called per-request (inside handler/loader), NOT at module level.

**`src/lib/auth.clie