State management

What is state management?

State is the data that describes what an application looks like and does at a given moment: whether a menu is open, what a user typed into a form, the items in a cart or the profile of the logged-in user. State management is the set of patterns and tools used to store that data, update it in a predictable way and share it between components.

In a small page, state is trivial. In a web app with dozens of screens, poor state management causes stale data, bugs that are hard to reproduce and slow interfaces.

Types of state

• Local state: belongs to a single component, such as an input value or a toggle.
• Shared state: used by several components, such as a filter that affects a list and a counter.
• Global state: needed across the whole app, such as the authenticated user or the theme.
• Server state: data fetched from an API, which can become outdated and needs caching and refetching.
• URL state: values kept in the address, such as a page number or search query, so views can be shared and bookmarked.

How it works

Most approaches follow the same loop: the interface triggers an action, the state is updated, and the interface re-renders from the new state. In a simple form, it looks like this:

const [count, setCount] = useState(0);

<button onClick={() => setCount(count + 1)}>
  Clicked {count} times
</button>

When many components need the same data, state is lifted to a common parent or moved into a dedicated store.

Common approaches compared

Best practices

• Keep state as local as possible and lift it only when needed.
• Avoid duplicating the same data in several places: keep one source of truth.
• Treat server data separately from UI state.
• Derive values instead of storing them, such as a total computed from cart items.
• Make updates immutable so changes are easy to track and debug.

State management at BeBranded

The right state strategy depends on the product, not on a trend. When we build a web app, we pick the lightest approach that keeps the interface fast and the data consistent, and we document it so your team can maintain it.