In short
A scalable Next.js project organizes routes by feature rather than by technical type, colocates route-specific components with their route while keeping genuinely shared components in a separate top-level folder, and establishes one consistent data-fetching convention rather than mixing patterns ad hoc across routes.
Why the default structure stops scaling
The default Next.js starter structure works fine for a small project, but as routes and features multiply, a flat structure with no organizing principle becomes hard to navigate — finding all the code related to one feature means searching across scattered folders rather than looking in one place.
Organize by feature, not by type
Rather than top-level folders named components, hooks, utils containing everything for the whole app, group code by the feature or domain it belongs to — a checkout folder containing its own components, hooks, and utilities, alongside a dashboard folder doing the same. This makes it obvious where to find or add code related to a specific feature, and makes it easier to see a feature's full scope in one place.
Colocating route-specific components
Using Next.js's app router, place components used only by one specific route inside that route's own folder, rather than in a shared top-level components directory. A component only ever used by the checkout page belongs near the checkout page, not mixed into a global folder where its limited scope isn't obvious.
Reserving shared folders for genuine reuse
A top-level components/shared (or similar) folder should contain only components genuinely used across multiple features — a button, a modal, a card. If something in this folder is actually only used in one place, that's a sign it was over-abstracted prematurely and should move back to being colocated with its actual single usage.
Establishing one data-fetching convention
Next.js supports fetching data in Server Components, in Route Handlers, and in various client-side patterns — pick a small number of consistent patterns for your project (e.g., Server Components for initial page data, a specific client library for interactive re-fetching) and apply them consistently, rather than letting each route improvise its own approach, which becomes hard to reason about as the codebase grows.
Route groups for organization without affecting URLs
Next.js's route group syntax (folders wrapped in parentheses) lets you organize routes logically — grouping all authenticated routes together, for instance — without those grouping folders appearing in the actual URL path. This is a clean way to impose organizational structure on routes that doesn't leak into the public-facing URL structure.
Shared types and utilities
Keep genuinely cross-cutting TypeScript types and utility functions in a clearly-named top-level location, separate from feature-specific code — but apply the same discipline as shared components: something only used by one feature belongs with that feature, not in the shared location by default.
A practical litmus test
When deciding where a new piece of code belongs, ask: is this used by more than one feature right now, not hypothetically in the future? If yes, it belongs in a shared location; if no, it belongs colocated with the one feature that uses it, and can be extracted to a shared location later if a genuine second use case actually appears.
Related on Troiana: How to Ship a Static Site With Zero Build Step · Why Your Site Doesn't Need a Framework.
Common questions
Should components always go in a global components folder?
No — colocate components used by only one route or feature with that route, and reserve a global shared folder only for components genuinely used across multiple features.
How should a large Next.js project handle data fetching consistently?
Pick a small number of consistent patterns (e.g., Server Components for initial data, one client library for interactive fetching) and apply them uniformly, rather than letting each route improvise its own approach.
What are Next.js route groups useful for?
Organizing routes logically (like grouping all authenticated pages) without that grouping affecting the actual URL structure, since route group folder names in parentheses are excluded from the path.
