Files & File System Tools
Browser-native inspectors and interactive testing tools for Files & File System. 100% client-side execution â zero external libraries.
File Reader
Asynchronously read contents of local files as Data URLs, Text, or ArrayBuffer.
File Information
Inspect File object metadata including name, size, type, and lastModified timestamp.
File Picker API
Open native system open-file picker dialog using showOpenFilePicker.
Directory Picker API
Request directory access and iterate local folder structures using showDirectoryPicker.
Save File API
Prompt native system save-file picker using showSaveFilePicker.
File System Access
Direct read and write access to local files with FileSystemHandle permissions.
File System Writable
Stream content directly to local files using FileSystemWritableFileStream.
Origin Private File System
High-performance private sandboxed storage space optimized for databases and workers.
Storage Manager
Estimate disk space quota usage and request persistent storage quota.
IndexedDB
Low-level transactional database for storing large amounts of structured client-side data.
Cache Storage
Store network Request/Response pairs for offline usage and PWA asset caching.