Uint32Array
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
TheUint32Array typed array represents an array of 32-bit unsigned integers in the platform byte order. If control over byte order is needed, useDataView instead. The contents are initialized to0 unless initialization data is explicitly provided. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation).
Uint32Array is a subclass of the hiddenTypedArray class.
Constructor
Uint32Array()Creates a new
Uint32Arrayobject.
Static properties
Also inherits static properties from its parentTypedArray.
Uint32Array.BYTES_PER_ELEMENTReturns a number value of the element size.
4in the case ofUint32Array.
Static methods
Inherits static methods from its parentTypedArray.
Instance properties
Also inherits instance properties from its parentTypedArray.
These properties are defined onUint32Array.prototype and shared by allUint32Array instances.
Uint32Array.prototype.BYTES_PER_ELEMENTReturns a number value of the element size.
4in the case of aUint32Array.Uint32Array.prototype.constructorThe constructor function that created the instance object. For
Uint32Arrayinstances, the initial value is theUint32Arrayconstructor.
Instance methods
Inherits instance methods from its parentTypedArray.
Examples
Different ways to create a Uint32Array
// From a lengthconst uint32 = new Uint32Array(2);uint32[0] = 42;console.log(uint32[0]); // 42console.log(uint32.length); // 2console.log(uint32.BYTES_PER_ELEMENT); // 4// From an arrayconst x = new Uint32Array([21, 31]);console.log(x[1]); // 31// From another TypedArrayconst y = new Uint32Array(x);console.log(y[0]); // 21// From an ArrayBufferconst buffer = new ArrayBuffer(32);const z = new Uint32Array(buffer, 4, 4);console.log(z.byteOffset); // 4// From an iterableconst iterable = (function* () { yield* [1, 2, 3];})();const uint32FromIterable = new Uint32Array(iterable);console.log(uint32FromIterable);// Uint32Array [1, 2, 3]Specifications
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-typedarray-objects |