What are components in React Native, and how are they used to build mobile applications?

Updated Feb 20, 2026

Short answer

In React Native, components are reusable building blocks that describe what appears on a mobile screen and how it behaves. Developers combine built-in components, custom components, props, and state to create complete iOS and Android applications using JavaScript or TypeScript.

Deep explanation

What are React Native components?

A component is an independent, reusable piece of UI. Instead of building an entire app as one large file, React Native applications are split into small components that each handle a specific responsibility.

Examples of built-in React Native components include:

View — a container used for layout, similar to a div on the web.
Text — displays text content.
Image — renders images.
TextInput — accepts user input.
Pressable — handles taps and touch interactions.
ScrollView and FlatList — display scrollable content.

A React Native app is essentially a tree of components that React renders into native mobile views.

How components are used

Components are combined in a hierarchy called the component tree. A parent component can contain multiple child components and pass data to them using props.

The main concepts are:

Concept	Purpose	Example
`Components`	Define reusable UI pieces	Login form, button, profile card
`Props`	Pass data from parent to child	User name, image URL
`State`	Store changing data inside a component	Input text, loading status
`Hooks`	Add logic to functional components	`useState`, `useEffect`

A simple component might look like this:

ProfileCard.tsx

TSX

1import { View, Text } from 'react-native';
2
3function ProfileCard({ name }) {
4  return (
5    <View>
6      <Text>{name}</Text>
7    </View>
8  );
9}
10
11export default ProfileCard;

Here, ProfileCard is a custom component. It receives name through props and displays it using native React Native components.

Component rendering flow

React Native components describe the desired UI. React then updates the native platform views when component data changes.

Rendering diagram…

Why components matter

Components improve application structure because each part can be developed, tested, and reused separately.

For example, an e-commerce app may have:

ProductCard for displaying products.
CartButton for adding items.
CheckoutForm for payment details.
Header for navigation.

Each component focuses on one job, making the application easier to maintain.

⚠️ A good React Native component usually has one clear responsibility and can be reused without depending heavily on the rest of the application.

Functional components and modern React Native

Modern React Native development primarily uses functional components with hooks instead of older class-based components.

A component can manage local state with useState:

Counter.tsx

TSX

1import { useState } from 'react';
2import { Button, Text } from 'react-native';
3
4function Counter() {
5  const [count, setCount] = useState(0);
6
7  return (
8    <>
9      <Text>{count}</Text>
10      <Button
11        title="Increase"
12        onPress={() => setCount(count + 1)}
13      />
14    </>
15  );
16}

When setCount changes the state, React Native re-renders the component with the updated value.

Components separate the UI description from the application logic, which is why React Native apps scale well from small screens to large products.

Real-world example

Imagine a food delivery app home screen. The screen could be built from smaller components:

RestaurantList displays available restaurants.
RestaurantCard shows one restaurant.
SearchBar handles searching.
OrderButton manages ordering actions.

RestaurantCard.tsx

TSX

1import { View, Text } from 'react-native';
2
3function RestaurantCard({ restaurant }) {
4  return (
5    <View>
6      <Text>{restaurant.name}</Text>
7      <Text>{restaurant.rating}</Text>
8    </View>
9  );
10}

The parent screen can reuse RestaurantCard for hundreds of restaurants by passing different restaurant data as props. This keeps the code organized and avoids duplicating UI logic.

Reusable components are the foundation of maintainable React Native applications.

Common mistakes

* **Huge components** - Creating one massive screen component makes changes difficult
split UI into smaller components with clear responsibilities.
* **Ignoring props design** - Passing too much unrelated data creates tight coupling
pass only the values a component actually needs.
* **Mutating state directly** - Changing state variables without React state methods prevents reliable re-rendering
use tools like `useState`.
* **Confusing components with screens** - A screen is often just a collection of components
reusable components should not depend on a single screen.
* **Overusing state** - Storing unnecessary data in state adds complexity
keep static values as regular variables or props.

Follow-up questions

What is the difference between props and state in React Native?
Why should React Native applications be broken into smaller components?
What happens when a component's state changes?
What is the difference between React Native components and native mobile components?