A Brief Overview of the File System API
The File System API lets web apps read, write, and manage files and folders—with user permission—using file and directory “handles,” plus a high-performance private storage option called OPFS.
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The File System API lets web apps read, write, and manage files and folders—with user permission—using file and directory “handles,” plus a high-performance private storage option called OPFS.
The File API enables web applications to access files and their contents when the user makes them available—typically via an control or drag and drop. Selected files are exposed as a FileList, which contains File objects that provide metadata like name, size, type, and last modified date. You can read a file’s contents using FileReader (asynchronously) or FileReaderSync in web workers, and you can also work with binary data through Blob objects.
The Fetch API is the standard, modern interface for requesting resources on the web—everything from JSON data to images, files, and more. It’s available as a global function in both window and web worker contexts, which makes it broadly useful whether you’re building a UI-driven app or doing background work
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