Guides
How to Build a Next.js Admin Dashboard
An admin dashboard has different requirements from a marketing site — it's behind auth, doesn't need to rank in search, and is judged on data density and speed of use rather than visual polish. This covers structuring one in Next.js with a persistent layout, protected routes, and a data table pattern.
Prerequisites
- arrow_rightA working Next.js App Router project
- arrow_rightAn authentication system already set up (see the Supabase auth guide)
- arrow_rightA data source (database or API) to display
Step 1: Structure the Dashboard Layout
app/dashboard/layout.tsx
export default function DashboardLayout({ children }: { children: React.ReactNode }) {
return (
<div className="flex">
<Sidebar />
<main className="flex-1 p-6">{children}</main>
</div>
);
}A dedicated layout for the /dashboard route group means the sidebar persists across navigation instead of re-rendering on every page change.
Step 2: Protect the Route Group
Check the session in middleware for any path under /dashboard, redirecting unauthenticated users to login before the layout or page even starts rendering.
Step 3: Build a Data Table
Fetch data server-side in the page component (a server component can query the database directly), and pass it to a client component only for the interactive parts — sorting, filtering, pagination controls.
Common Errors
- arrow_rightSidebar re-rendering or flashing on navigation — confirm it lives in the layout, not duplicated inside each page
- arrow_rightLarge tables slow to render — add pagination or virtualization rather than rendering thousands of rows at once
- arrow_rightRole checks only in the UI — permissions must also be enforced at the API/data layer, not just hidden in the interface
Performance Considerations
- arrow_rightFetch only the data a given view needs — avoid loading entire tables client-side just to filter in the browser
- arrow_rightPaginate or virtualize long lists
- arrow_rightKeep heavy client-side libraries (charting, rich tables) out of the initial bundle where possible using dynamic imports
Frequently Asked Questions
Should the dashboard be server-rendered or client-rendered?add
A hybrid — data fetching and the initial render can happen server-side for speed, while sorting, filtering, and other interactions run client-side once the data's loaded.
How do I add role-based permissions?add
Check the user's role both in middleware (to gate entire sections) and at the data-fetching level (to filter what's actually returned), never relying solely on hiding UI elements.
What's the best way to handle large data tables?add
Server-side pagination — fetch only the current page of results rather than loading the full dataset into the browser and paginating client-side.