Non-standard: This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

The readAsArrayBuffer() method of the IDBFileHandle interface reads the content of the associated file into an ArrayBuffer. In many ways, it performs like the FileReader.readAsArrayBuffer() method.

The reading operation starts at the position given by the location property.

Note: The three interfaces IDBMutableFile, IDBFileHandle, and IDBFileRequest are deprecated and only implemented for backward compatibility in Firefox. Do not use them anymore: consider using the File and Directory Entries API instead.





A number representing the number of bytes to read in the file.

Return value

An IDBFileRequest object to handle the success or failure of the operation. In case of success, the request's result is an ArrayBuffer representing the data that have been read.


This feature is not part of any current specification. It is no longer on track to become a standard.

Browser compatibility

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See also