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title short-title slug page-type status browser-compat
Window: showSaveFilePicker() method
showSaveFilePicker()
Web/API/Window/showSaveFilePicker
web-api-instance-method
experimental
api.Window.showSaveFilePicker

{{APIRef("File System API")}}{{SecureContext_Header}}{{SeeCompatTable}}

The showSaveFilePicker() method of the {{domxref("Window")}} interface shows a file picker that allows a user to save a file. Either by selecting an existing file, or entering a name for a new file.

Syntax

showSaveFilePicker()

Parameters

  • options {{Optional_Inline}}

    • : An object containing options, which are as follows:

      • excludeAcceptAllOption {{Optional_Inline}}

        • : A boolean value that defaults to false. By default, the picker should include an option to not apply any file type filters (instigated with the type option below). Setting this option to true means that option is not available.

      • id {{Optional_Inline}}

        • : By specifying an ID, the browser can remember different directories for different IDs. If the same ID is used for another picker, the picker opens in the same directory.

      • startIn {{Optional_Inline}}

        • : A FileSystemHandle or a well known directory ("desktop", "documents", "downloads", "music", "pictures", or "videos") to open the dialog in.

      • suggestedName {{Optional_Inline}}

        • : A {{jsxref('String')}}. The suggested file name.

      • types {{Optional_Inline}}

        • : An {{jsxref('Array')}} of allowed file types to save. Each item is an object with the following options:

          • description {{Optional_Inline}}
            • : An optional description of the category of files types allowed. Default to be an empty string.
          • accept
            • : An {{jsxref('Object')}} with the keys set to the MIME type and the values an {{jsxref('Array')}} of file extensions (see below for an example).

Return value

A {{jsxref("Promise")}} whose fulfillment handler receives a {{domxref('FileSystemFileHandle')}} object.

Exceptions

  • AbortError {{domxref("DOMException")}}
    • : Thrown if the user dismisses the file picker without selecting or inputting a file, or if the user agent deems any selected files too sensitive or dangerous.
  • SecurityError {{domxref("DOMException")}}
    • : Thrown if the call was blocked by the same-origin policy or it was not called via a user interaction such as a button press.
  • {{jsxref("TypeError")}}
    • : Thrown if accept types can't be processed, which may happen if:
      • Any key string of the accept options of any item in types options can't parse a valid MIME type.
      • Any value string(s) of the accept options of any item in types options is invalid, for example, if it does not start with . and if end with ., or if it contains any invalid code points and its length is more than 16.
      • The types options is empty and the excludeAcceptAllOption options is true.

Security

Transient user activation is required. The user has to interact with the page or a UI element in order for this feature to work.

Examples

The following function shows a file picker, with text files highlighted for selection.

async function getNewFileHandle() {
  const opts = {
    types: [
      {
        description: "Text file",
        accept: { "text/plain": [".txt"] },
      },
    ],
  };
  return await window.showSaveFilePicker(opts);
}

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also