The FilenameConflictAction type of the 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 function's options parameter.


Values of this type are strings. Possible values are:

The browser will modify the filename to make it unique.
The browser will overwrite the old file with the newly-downloaded file.
The browser will prompt the user, asking them to choose whether to uniquify or overwrite.

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxOperaFirefox for Android
Basic supportChrome Full support YesEdge No support NoFirefox Full support 47Opera Full support YesFirefox Android Full support 48
promptChrome Full support YesEdge No support NoFirefox No support NoOpera Full support YesFirefox Android No support No


Full support  
Full support
No support  
No support


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

Microsoft Edge compatibility data is supplied by Microsoft Corporation and is included here under the Creative Commons Attribution 3.0 United States License.

Document Tags and Contributors

Contributors to this page: wbamberg, chrisdavidmills
Last updated by: wbamberg,