Reference

Architecture

The file map, the four API routes, and the files you should not rewrite.

Launch Kit is one Next.js 15 app. Server Components by default. "use client" only where clicks or browser APIs need it. No server actions.

Routes

Path	Role
`/`	Marketing homepage
`/signin`	Google + magic link
`/dashboard`	Private product shell
`/blog`, `/blog/[slug]`	MDX blog
`/docs`, `/docs/[slug]`	These docs
`/tos`, `/privacy-policy`	Legal
`/showcase`	Section catalog, `noindex`

API

Method	Path	Role
`GET`	`/api/auth/callback`	Exchange the auth code, redirect to `callbackUrl`
`POST`	`/api/stripe/create-checkout`	Open Stripe Checkout. Guests allowed
`POST`	`/api/stripe/create-portal`	Billing portal. Auth required
`POST`	`/api/webhook/stripe`	Grant or revoke access, send welcome email

Top of the tree

text

app/                 pages, layouts, API routes, globals.css
components/
  blog/              article layout and MDX extras
  docs/              docs chrome
  legal/             Terms / Privacy wrapper
  layout/            Header, Footer, client chrome
  sections/          landing page blocks
  ui/                checkout, sign-in, account, theme
content/blog/        your-slug.mdx
content/docs/        this documentation
libs/                supabase, stripe, resend, seo, blog, docs
config.ts            product settings
middleware.ts        session refresh only

Leave these alone

libs/supabase/* and middleware.ts
libs/stripe.ts and the three Stripe routes
app/api/auth/callback/route.ts
libs/resend.ts — call it, do not replace it
libs/blog.ts / libs/seo.tsx unless you are changing SEO behaviour
next.config.js, postcss.config.js

Know about, do not treat as product features

Newsletter submit is a stub
resend.fromNoReply is unused
STRIPE_PUBLIC_KEY is unused
has_access is written by the webhook and not read until you gate a route
nodemailer is in package.json and unused

These docs

/docs is Launch Kit’s documentation. Before you launch your own domain, delete app/docs and content/docs (and the Docs links in the header and footer) so customers do not see this site.