Building a Booking System with Next.js

Booking flows look simple on the surface: pick a date, pick a slot, pay, done. In practice, they touch authentication, inventory, payments, notifications, and admin dashboards.

I've shipped this pattern on Zio Hair (salon appointments + e-commerce) and Tiem Tour (tour search, filters, and custom requests).

Core user flow

1. Browse services or tours
2. Filter by date, time, stylist, or destination
3. Add to cart or book directly
4. Pay via OnePay or Megapay
5. Receive confirmation (email / admin notification)

The goal is zero confusion between steps. Every screen should answer: where am I, what did I pick, and what's next?

Frontend architecture

// Simplified booking state
const [step, setStep] = useState<"browse" | "details" | "payment">("browse")
const [selection, setSelection] = useState<BookingSelection | null>(null)

I typically use Zustand for multi-step booking state — lighter than Redux for form-heavy flows, but still easy to debug.

Admin side matters too

Clients need to manage appointments, update availability, and handle cancellations. WordPress admin + custom post types often handle this, while Next.js serves the customer-facing UI.

What I learned

• Validate early: disable invalid dates/times before the user reaches payment
• Show loading states on payment redirects — users panic on blank screens
• Log booking failures server-side; "payment failed" without context is useless
• Mobile-first: most booking traffic is on phones

A good booking system feels boring in the best way — predictable, fast, and trustworthy.