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React is a JavaScript library for building user interfaces.
It organizes interfaces into reusable components that can manage their own behavior and combine into larger applications.
Instead of manually updating individual pieces of the browser DOM every time information changes, developers describe what the interface should look like for a given state.
React then handles the rendering process.
A product might contain components such as:
Those components can be combined and reused across different screens.
This component-based model is one of the main reasons React works well for applications that grow considerably over time.
React is primarily used to build interactive web interfaces, although the broader React ecosystem also extends into server-rendered applications and mobile development.
React works well for SaaS products that contain:
Component reuse can help teams maintain consistency as the product expands.
Dashboards often contain interactive charts, filters, tables, tabs, and changing data.
React's state and component model makes it useful for interfaces where information updates without requiring an entirely new page load.
React can support interactive shopping experiences involving:
For storefronts where SEO and server rendering matter, React is frequently paired with a framework such as Next.js.
Marketplaces have complex interfaces connecting buyers, sellers, inventory, messaging, payments, profiles, and search.
React can help separate those experiences into reusable features and components.
Operations teams, finance teams, support organizations, and other departments increasingly rely on browser-based internal software.
React can power:
Interactive consumer products such as social platforms, productivity tools, media applications, and financial apps may use React for highly dynamic interfaces.
React can support interfaces that update as information changes.
Examples include:
The underlying real-time connection might use WebSockets, Server-Sent Events, polling, or another technology while React manages the interface state.
React can also participate in server-rendered architectures.
Frameworks such as Next.js combine React with routing, server rendering, data fetching, caching, and backend capabilities.
This expands React beyond traditional browser-only single-page applications.
React Native uses the React programming model to build native mobile applications for iOS and Android.
React and React Native share important concepts, although they target different platforms.
React development combines JavaScript fundamentals with framework-specific patterns and broader front-end engineering skills.
Components are the foundation of React.
Strong developers understand how to divide an application into pieces that are:
Components that are too large become difficult to maintain.
Components that are broken into excessively small pieces can make the application harder to understand.
Good architecture finds a practical balance.
JSX allows developers to describe interface structures using syntax that combines JavaScript with markup-like elements.
React developers should understand how expressions, conditions, loops, attributes, and components work within JSX.
Props allow components to receive information from their parents.
They help make components reusable by allowing the same component to display different content or behavior depending on the data passed into it.
State represents information that changes while someone interacts with an application.
Examples include:
Developers need to decide where state should live and which parts of the application need access to it.
Hooks give function components access to React capabilities such as state, context, references, and lifecycle-related behavior.
Important Hooks include:
useStateuseEffectuseContextuseReduceruseRefuseMemouseCallbackKnowing the names isn't enough.
Strong React skills include understanding when a Hook is appropriate and when introducing one creates unnecessary complexity.
Custom Hooks allow developers to extract reusable behavior from components.
For example, an application could create custom Hooks for:
Well-designed custom Hooks can reduce duplication without hiding important application logic.
Effects allow components to synchronize with systems outside React.
Examples include:
Misusing effects is a common source of unnecessary renders and difficult-to-debug behavior.
Strong developers understand when logic belongs in an effect and when it can be handled more directly.
Context allows information to be shared through a component tree without passing it manually through every intermediate component.
Common examples include:
Context is useful, but using it for every piece of shared state can create unnecessary re-rendering and coupling.
Larger applications may need additional state-management patterns.
Common options include:
The right choice depends on the complexity and type of state.
Strong React development includes knowing when React's built-in capabilities are sufficient.
Information retrieved from APIs behaves differently from local UI state.
Libraries such as TanStack Query can help manage:
Separating server state from local interface state can simplify application architecture.
Applications frequently wait for:
Good React applications communicate those transitions clearly through loading states, skeletons, optimistic updates, disabled actions, or other feedback.
Suspense allows parts of a React interface to display fallback content while required resources become available.
It can participate in code splitting, streaming, and framework-driven data-loading architectures.
Developers need to understand how Suspense boundaries affect the user experience instead of simply placing one around an entire application.
Modern React workflows can support Actions and optimistic updates.
Optimistic UI lets the interface temporarily reflect an expected successful result before the underlying asynchronous operation finishes.
For example, clicking “Like” can update the interface immediately while the server request completes.
If the operation fails, the interface can respond accordingly.
Server Components allow compatible React frameworks to render selected components on the server.
They can help teams move some data access and rendering work closer to backend resources while reducing the amount of JavaScript that needs to reach the browser.
Developers working with modern React architectures should understand the distinction between server and client components.
Forms can become one of the most complicated parts of an interface.
Developers need to handle:
Libraries such as React Hook Form can simplify larger forms, while smaller forms may not require additional abstractions.
React itself focuses on user interfaces.
Client-side applications frequently add routing through React Router, while frameworks such as Next.js provide their own routing systems.
Routing skills include:
Most React applications communicate with backend services.
Developers should understand:
GraphQL may also be relevant depending on the application.
TypeScript is widely used alongside React to add static type checking.
It can improve reliability around:
TypeScript becomes particularly valuable as React applications and teams grow.
React applications can become slow when they render too much work or send excessive JavaScript to the browser.
Important performance concepts include:
Optimization should be driven by actual bottlenecks rather than adding useMemo or useCallback everywhere.
React applications still need to follow web accessibility principles.
Important areas include:
A visually correct component can still be difficult or impossible for some users to operate.
Applications need predictable behavior when something fails.
React developers should think about:
React applications can be tested at several levels.
Developers may use:
Testing should emphasize behavior that matters to the user rather than implementation details.
React sits within a broad front-end ecosystem.
JavaScript is the underlying language behind React.
Strong JavaScript fundamentals are essential for understanding React rather than memorizing framework patterns.
TypeScript adds static typing and is commonly used in production React applications.
Next.js is a React framework that adds capabilities such as:
React and Next.js should remain separate skill topics because Next.js adds substantial framework-level behavior beyond React itself.
Vite is commonly used to create and build client-side React applications.
It provides a fast development environment and modern build tooling.
React Router provides client-side routing for applications that aren't using a framework with its own routing layer.
TanStack Query helps manage asynchronous server data.
It can handle caching, refetching, mutations, loading, and stale data.
Redux Toolkit provides structured global state management for applications that need centralized state.
Zustand provides a lighter state-management approach that many React teams use for shared client-side state.
Tailwind CSS can be used to style React components through utility classes.
CSS Modules allow component styles to remain locally scoped and can work well in applications that prefer traditional CSS patterns.
Storybook allows teams to develop and document UI components independently.
It's particularly useful for:
React Testing Library helps test components from the user's perspective.
It encourages teams to verify observable behavior rather than internal implementation details.
Vitest and Jest can support unit and integration testing across React codebases.
Playwright and Cypress can test complete application workflows in a browser.
React applications may use GraphQL when the backend exposes a GraphQL API.
Libraries such as Apollo can help manage queries, mutations, and caching.
Node.js frequently appears alongside React when teams use JavaScript or TypeScript across both front-end and backend development.
A modern React workflow might look like this:
React is one piece of the front-end stack, but its component architecture often becomes the layer connecting design, data, application behavior, and user interaction.
React appears across several software-development roles.
A React Developer specializes in building and maintaining interfaces where React is the primary front-end technology.
A Front-End Developer may work with React, Vue, Angular, or another framework while also owning broader browser technologies such as HTML, CSS, and JavaScript.
A Next.js Developer specializes in applications built using the React-based Next.js framework.
Their work may include server rendering, Server Components, routing, caching, and full-stack functionality.
A Full-Stack Developer may use React on the front end while also building APIs, databases, and backend services.
A JavaScript Developer may work across React alongside other JavaScript libraries, frameworks, and application environments.
A TypeScript Developer may use TypeScript extensively within React applications while working across other parts of a TypeScript stack.
A React Native Developer applies React concepts to native mobile development for iOS and Android.
UI Engineers often combine React development with deeper expertise in design systems, accessibility, CSS, animation, and component architecture.
React and Next.js are closely related, but they aren't interchangeable.
React is the UI library.
It provides:
Next.js is an application framework built around React.
It adds capabilities such as:
If you're building a client-side application with a separate backend, React with Vite or another setup may be enough.
If you need a more integrated application framework, particularly with server rendering, Next.js may be a better fit.
React targets user interfaces, primarily in web environments.
React Native applies the React programming model to native mobile applications.
Developers working with both will recognize:
However, the rendering environments and platform APIs are different.
Web React uses elements such as div, button, and browser APIs.
React Native uses native mobile components and iOS or Android platform capabilities.
React doesn't replace JavaScript.
It runs on top of JavaScript.
A developer can know JavaScript without knowing React.
A strong React professional, however, should already understand JavaScript concepts such as:
Weak JavaScript fundamentals often become visible as React applications become more complex.
React is a JavaScript library for building component-based user interfaces.
It helps developers create interactive web applications from reusable pieces of UI.
Important React skills include component architecture, JSX, props, state, Hooks, custom Hooks, asynchronous data, state management, routing, API integration, TypeScript, performance, accessibility, and testing.
No.
React is a JavaScript library.
Developers typically write React applications using JavaScript or TypeScript.
React describes itself as a library for user interfaces.
Frameworks such as Next.js build on top of React and provide additional application-level capabilities such as routing and server rendering.
No.
React works with JavaScript.
However, TypeScript is commonly used in larger production codebases because it helps teams define interfaces and catch certain classes of errors earlier.
Yes.
Next.js is built around React and adds capabilities for routing, server rendering, Server Components, data fetching, and full-stack application development.
React supports server-rendering capabilities, typically used through frameworks that provide the surrounding architecture.
It depends on the application.
React's built-in state and Context may be enough for many products.
Redux Toolkit, Zustand, Jotai, and other libraries can help when shared client state becomes more complex.
Server state is often better handled separately through tools such as TanStack Query.
React Developers, Front-End Developers, Next.js Developers, Full-Stack Developers, JavaScript Developers, TypeScript Developers, React Native Developers, and UI Engineers may all use React.
Understanding React helps you identify whether your application needs stronger component architecture, state management, TypeScript, performance, accessibility, testing, or integration with the broader front-end ecosystem.
If you need someone dedicated to building and maintaining React applications, South can help you hire React Developers in Latin America.
Schedule a free call and find remote development talent in Latin America with South.
