index.md

---

title: downloads.FilenameConflictAction
slug: Mozilla/Add-ons/WebExtensions/API/downloads/FilenameConflictAction
page-type: webextension-api-type
tags:
  - API
  - Add-ons
  - Extensions
  - FilenameConflictAction
  - Non-standard
  - Reference
  - Type
  - WebExtensions
  - downloads
browser-compat: webextensions.api.downloads.FilenameConflictAction

---

{{AddonSidebar()}}

The FilenameConflictAction type of the {{WebExtAPIRef("downloads")}} API specifies what to do if the name of a downloaded file conflicts with an existing file.

This type defines the values that can be used for the conflictAction property of the {{WebExtAPIRef("downloads.download")}} function's options parameter.

Type

Values of this type are strings. Possible values are:

• "uniquify"

  • : The browser will modify the filename to make it unique.

• "overwrite"

  • : The browser will overwrite the old file with the newly-downloaded file.

• "prompt"

  • : The browser will prompt the user, asking them to choose whether to uniquify or overwrite.

Browser compatibility

{{Compat}}

{{WebExtExamples}}

Note: This API is based on Chromium's chrome.downloads API.