What is Single Page Application? — UK Software Development Guide
Direct Answer
A Single Page Application (SPA) is a web application that loads a single HTML page and dynamically updates content using JavaScript as users interact with it — without reloading the full page. React, Angular, and Vue are the most popular SPA frameworks. This contrasts with Multi-Page Applications (MPA) where each page is a separate HTML document served from the server.
Spa in the UK
SPAs have specific UK GDPR implications. SPAs process significant amounts of user data client-side in JavaScript — which is less visible than server-side processing and can inadvertently expose personal data through browser developer tools. UK GDPR privacy by design (Article 25) applies to SPAs: sensitive operations should be performed server-side rather than in client-side JavaScript. Accessibility: SPAs require careful implementation for screen reader compatibility — dynamic content updates must trigger ARIA live region announcements. Next.js (which can render React server-side) is often preferable to a pure SPA for UK compliance and SEO requirements.
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