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


dataview.getBigUint64(byteOffset [, littleEndian])


The offset, in bytes, from the start of the view to read the data from.
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.

Return value

A BigInt.

Errors thrown

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.


Using the getBigUint64 method

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


Specification Status Comment
DataView.prototype.getBigUint64 proposal

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
getBigUint64Chrome Full support 67Edge No support NoFirefox Full support 68IE No support NoOpera Full support 54Safari No support NoWebView Android Full support 67Chrome Android Full support 67Firefox Android Full support 68Opera Android Full support 48Safari iOS No support NoSamsung Internet Android No support Nonodejs Full support 10.4.0


Full support  
Full support
No support  
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See also