DataView.prototype.getBigUint64()

The getBigUint64() method gets an unsigned 64-bit integer (unsigned long long) at the specified byte offset from the start of the DataView.

Syntax

getBigUint64(byteOffset)
getBigUint64(byteOffset, littleEndian)

byteOffset: The offset, in bytes, from the start of the view to read the data from.
littleEndian: Optional Indicates whether the 64-bit int is stored in little- or big-endian format. If false or undefined, a big-endian value is read.

RangeError: Thrown if the byteOffset is set such that it would read beyond the end of the view.

There is no alignment constraint; multi-byte values may be fetched from any offset.

var buffer = new ArrayBuffer(8);
var dataview = new DataView(buffer);
dataview.getBigUint64(0); // 0n

Specification
ECMAScript Language Specification # sec-dataview.prototype.getbiguint64

BCD tables only load in the browser