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.
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