Fetch API, WebSockets, and Service Workers: How They Power Modern Web Apps

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Three core browser APIs — the Fetch API, WebSockets, and Service Workers — form the backbone of modern, interactive web applications. The Fetch API offers a promise-based approach to making HTTP network requests, replacing the older XMLHttpRequest with a cleaner, more flexible interface. WebSockets establish a persistent, two-way communication channel over a single TCP connection, making them ideal for real-time use cases such as chat apps, live data feeds, and multiplayer gaming. Service Workers run as background scripts separate from the web page, enabling offline caching, push notifications, and background data synchronization. Together, these APIs allow developers to build Progressive Web Apps that are faster, more reliable, and capable of functioning even with limited or no network connectivity.

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