React JS is a JavaScript library used in web development to build interactive elements on websites.

React JS is a JavaScript library used in web development to build interactive elements on websites. It offers effective solutions to some of front-end programming’s most persistent issues, and allows developers to build dynamic and interactive web apps with ease. 

React JS is a useful tool of web development, which is popular in the IT world, and it’s also our favorite as many benefits it can bring to website projects. Now let’s find out its features and advantages:

It facilitates the overall process of writing components: JSX is an optional syntax extension to JavaScript that makes writing your own components much easier. JSX can prove its usefulness in building high-volume apps or custom components, excluding typos in large tree structures, and making it easier to convert from HTML mockups to React-Element trees. Besides that, it provides React developers with informative warning and error messages and also helps to prevent code injections.

It boosts productivity and facilitates further maintenance: one of the best features of React JS is reuse system components, which is well-known among designers, who typically re-employ the same digital objects. You can start with the finest components (checkbox, button, etc.), then move to wrapper components comprised of these tiny elements and move forward until the main, root component. All components have their internal logic, what makes it easier to manipulate and define them. Such approach ensures consistent app look and facilitates codebase maintenance and growth.

It guarantees stable code: to make sure that even small changes that take place in the child structures won't affect their parents, React JS uses only downward data flow. Changing an object, developers just modify its state, make changes, and, after that, only particular components will be updated. This structure of data binding ensures code stability and continuous app performance.

It is SEO friendly: another React JS benefit is its ability to deal with a common search engine failure to read JavaScript-heavy apps. As a solution, React can run on the server, rendering and returning the virtual DOM to the browser as a regular webpage.

It comes with a helpful developer toolset: learning new technologies and using them in the next project can be fun, but only if they can be actually applied in the development environment. It means that a framework or library should come with a proper tooling for efficient performance. Among React JS advantages are its coverage with debugging and design tools.
React Developer Tools is a browser extension available for both Chrome and Firefox. It enables developers to observe reactive component hierarchies, discover child and parent components, and inspect their current state and props.

There is React Native for mobile app development: in both web and mobile application development React follows the same design patterns, and transition process. By using plain JavaScript and React you'll be able to build rich UI for native apps, supported by both iOS and Android platforms.