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Five underused browser APIs that can improve web app performance and privacy

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Modern browsers now include built-in Web APIs that can replace backend services and third-party libraries for many common tasks. The FileReader API allows apps to read local files directly on the user's device, eliminating the need for uploads and improving privacy. URL.createObjectURL() enables in-browser file generation for PDFs, CSVs, and images, reducing server load and speeding up downloads. Web Workers offload heavy computations to background threads, keeping the UI responsive, while the Clipboard API offers a cleaner, modern alternative to the deprecated execCommand() method. The Intersection Observer API efficiently detects when elements enter the viewport, making it a better option than scroll event listeners for lazy loading and animations.

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