TypedArray.BYTES_PER_ELEMENT
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.
The TypedArray.BYTES_PER_ELEMENT static data property represents the size in bytes of each element in a typed array.
Try it
console.log(Float64Array.BYTES_PER_ELEMENT);
// Expected output: 8
console.log(Int8Array.BYTES_PER_ELEMENT);
// Expected output: 1
Value
A number whose value depends on the type of TypedArray.
Property attributes of TypedArray.BYTES_PER_ELEMENT | |
|---|---|
| Writable | no |
| Enumerable | no |
| Configurable | no |
Description
TypedArray objects differ from each other in the number of bytes per element and in the way the bytes are interpreted. The BYTES_PER_ELEMENT constant contains the number of bytes each element in the given TypedArray has.
The BYTES_PER_ELEMENT property is both an instance property and a static property. It's available on both TypedArray subclass constructors and on instances of those constructors.
As an instance property, BYTES_PER_ELEMENT is defined on the constructor's prototype.
console.log(Object.hasOwn(Int8Array.prototype, "BYTES_PER_ELEMENT")); // true
Examples
Using BYTES_PER_ELEMENT
As a static property:
Int8Array.BYTES_PER_ELEMENT; // 1
Uint8Array.BYTES_PER_ELEMENT; // 1
Uint8ClampedArray.BYTES_PER_ELEMENT; // 1
Int16Array.BYTES_PER_ELEMENT; // 2
Uint16Array.BYTES_PER_ELEMENT; // 2
Float16Array.BYTES_PER_ELEMENT; // 2
Int32Array.BYTES_PER_ELEMENT; // 4
Uint32Array.BYTES_PER_ELEMENT; // 4
Float32Array.BYTES_PER_ELEMENT; // 4
Float64Array.BYTES_PER_ELEMENT; // 8
BigInt64Array.BYTES_PER_ELEMENT; // 8
BigUint64Array.BYTES_PER_ELEMENT; // 8
As an instance property:
new Int8Array([]).BYTES_PER_ELEMENT; // 1
new Uint8Array([]).BYTES_PER_ELEMENT; // 1
new Uint8ClampedArray([]).BYTES_PER_ELEMENT; // 1
new Int16Array([]).BYTES_PER_ELEMENT; // 2
new Uint16Array([]).BYTES_PER_ELEMENT; // 2
new Float16Array([]).BYTES_PER_ELEMENT; // 2
new Int32Array([]).BYTES_PER_ELEMENT; // 4
new Uint32Array([]).BYTES_PER_ELEMENT; // 4
new Float32Array([]).BYTES_PER_ELEMENT; // 4
new Float64Array([]).BYTES_PER_ELEMENT; // 8
new BigInt64Array([]).BYTES_PER_ELEMENT; // 8
new BigUint64Array([]).BYTES_PER_ELEMENT; // 8
Specifications
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-typedarray.bytes_per_element |
Browser compatibility
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