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Files & File System Web API Demonstrations

Browser-native interactive demonstrations for Files & File System. 100% client-side execution — zero external JS libraries required.

11 Demonstrations

Asynchronously read contents of local files as Data URLs, Text, or ArrayBuffer.

Inspect File object metadata including name, size, type, and lastModified timestamp.

Open native system open-file picker dialog using showOpenFilePicker.

Request directory access and iterate local folder structures using showDirectoryPicker.

Prompt native system save-file picker using showSaveFilePicker.

Direct read and write access to local files with FileSystemHandle permissions.

Stream content directly to local files using FileSystemWritableFileStream.

High-performance private sandboxed storage space optimized for databases and workers.

Estimate disk space quota usage and request persistent storage quota.

Low-level transactional database for storing large amounts of structured client-side data.

Store network Request/Response pairs for offline usage and PWA asset caching.