What is React.js? — UK Software Development Guide
Direct Answer
React (also known as React.js or ReactJS) is an open-source JavaScript library developed by Meta (formerly Facebook) for building user interfaces. React uses a component-based architecture — UI is built from reusable, self-contained pieces — and a virtual DOM (Document Object Model) that efficiently updates the browser UI when data changes.
React in the UK
React is the dominant frontend framework in the UK software market — used by the majority of UK software agencies and technology companies for web application development. React developers command a salary premium of 10–20% above average developers. The UK React developer talent pool is deep in London and growing significantly in Manchester, Edinburgh, and Bristol. React pairs well with Next.js for SSR/SEO requirements and TypeScript for type safety.
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