DataView() constructor

The DataView() constructor creates DataView objects.

Try it


new DataView(buffer)
new DataView(buffer, byteOffset)
new DataView(buffer, byteOffset, byteLength)

Note: DataView() can only be constructed with new. Attempting to call it without new throws a TypeError.



An existing ArrayBuffer or SharedArrayBuffer to use as the storage backing the new DataView object.

byteOffset Optional

The offset, in bytes, to the first byte in the above buffer for the new view to reference. If unspecified, the buffer view starts with the first byte.

byteLength Optional

The number of elements in the byte array. If unspecified, the view's length will match the buffer's length.

Return value

A new DataView object representing the specified data buffer.



Thrown if the byteOffset or byteLength parameter values result in the view extending past the end of the buffer.

For example, if the buffer is 16 bytes long, the byteOffset is 8, and the byteLength is 10, this error is thrown because the resulting view tries to extend 2 bytes past the total length of the buffer.


Using DataView

const buffer = new ArrayBuffer(16);
const view = new DataView(buffer, 0);

view.setInt16(1, 42);
view.getInt16(1); // 42


ECMAScript Language Specification
# sec-dataview-constructor

Browser compatibility

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See also