JavaScript Typed Arrays
New to JavaScript Type Array?
Typed Array Types
Revised July 2025
| Name | Range | Type |
|---|---|---|
| Int8Array | -128 / 127 | 1 byte signed integer |
| Uint8Array | 0 / 255 | 1 byte unsigned integer |
| Uint8ClampedArray | 0 / 255 | 1 byte unsigned integer |
| Int16Array | -32768 / 32767 | 2 bytes signed short |
| Uint16Array | 0 / 65535 | 2 bytes unsigned short |
| Int32Array | -231 / 231 - 1 | 4 bytes signed long |
| Uint32Array | 0 / 232 - 1 | 4 bytes unsigned long |
| BigInt64Array | -263 / 263 - 1 | 8 bytes signed big integer |
| BigUint64Array | 0 / 264 - 1 | 8 bytes unsigned big integer |
| Float16Array | -65504 / 65504 | 2 bytes floating point |
| Float32Array | -3.4e38 / 3.4e38 | 4 bytes floating point |
| Float64Array | -1.8e308 / 1.8e308 | 8 bytes floating point |
Note
Typed arrays are not arrays.
isArray() on a typed array returns false.
See Also:
Typed Array Benefits
Typed arrays provide a way to handle binary data as efficiently as arrays work in C.
Typed arrays are raw memory, so JavaScript can pass them directly to any function without converting the data to another representation.
Typed arrays are seriously faster than normal arrays for passing data to functions that can use raw binary data (Computer Games, WebGL, Canvas, File APIs, Media APIs).
Browser APIs Supporting Typed Arrays
Fetch API Example
fetch(url)
.then(request => request.arrayBuffer())
.then(arrayBuffer =>...);
Canvas Example
const canvas = document.getElementById('my_canvas');
const context = canvas.getContext('2d');
const imageData = context.getImageData(0, 0, canvas.width, canvas.height);
const uint8ClampedArray = imageData.data;
Browser Support
Typed Array is an ECMAScript6 (ES6 2015) feature.
JavaScript 2015 is supported in all browsers since June 2017:
| Chrome 51 | Edge 15 | Firefox 54 | Safari 10 | Opera 38 |
| May 2016 | Apr 2017 | Jun 2017 | Sep 2016 | Jun 2016 |
