File System Access API

All web apps now support the new File System Access API available in most modern browsers.

You can open and save files using the native "file picker" dialogs on the platform you are using.

You can quickly save an opened file back the file system without annoying UI. You can undo changes by swiftly reloading the file.

More on the API

The File System Access API (formerly known as Native File System API and prior to that it was called Writeable Files API) enables developers to build powerful web apps that interact with files on the user's local device, like IDEs, photo and video editors, text editors, and more. After a user grants a web app access, this API allows them to read or save changes directly to files and folders on the user's device. Beyond reading and writing files, the File System Access API provides the ability to open a directory and enumerate its contents. [web.dev]

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