The Art of Writing Maintainable React Code

Maintainable React is less about clever abstractions and more about predictable boundaries. A component that reads top to bottom, does one thing, and hands state up or down in an obvious way will outlive any pattern of the month.

Start with the data. Most component messes are really state messes: the same value derived in three places, or a piece of server data cached in local state and slowly drifting out of sync. Keep server state in a query cache, keep UI state local, and resist mixing them.

Colocate everything a component needs — its styles, its tests, its small helpers — and extract only when a second caller actually appears. Premature extraction hides intent behind indirection and makes refactoring more expensive, not less.

Finally, write the component you would want to debug at 2am: explicit props, no hidden context dependencies, and names that say what things are rather than how they're implemented.