Web APIs extend JavaScript with powerful browser capabilities. Here's a guide to the most useful ones.
Fetch API#
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Web Storage API#
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Clipboard API#
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Geolocation API#
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Notification API#
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Intersection Observer API#
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ResizeObserver API#
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MutationObserver API#
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Broadcast Channel API#
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Web Workers#
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Performance API#
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Best Practices#
Error Handling:
✓ Always check API availability
✓ Handle permission denials
✓ Provide fallbacks
✓ Use try-catch with async APIs
Performance:
✓ Use observers over polling
✓ Disconnect observers when done
✓ Debounce frequent callbacks
✓ Use workers for heavy tasks
Security:
✓ Validate user input
✓ Handle CORS properly
✓ Be careful with clipboard
✓ Request minimal permissions
Compatibility:
✓ Check browser support
✓ Use feature detection
✓ Provide polyfills
✓ Test across browsers
Conclusion#
Web APIs provide powerful browser capabilities. Use Fetch for network requests, Storage for persistence, Observers for efficient DOM watching, and Workers for heavy computation. Always check availability, handle errors gracefully, and clean up resources when done.