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The resizable accessor property of ArrayBuffer instances represents whether the ArrayBuffer can be resized or not.

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The resizable property is an accessor property whose set accessor function is undefined, meaning that you can only read this property. The value is established when the array is constructed. If the maxByteLength option was set in the constructor, resizable will return true; if not, it will return false.


Using resizable

In this example, we create a 8-byte buffer that is resizable to a max length of 16 bytes, then check its resizable property, resizing it if resizable returns true:

const buffer = new ArrayBuffer(8, { maxByteLength: 16 });

if (buffer.resizable) {
  console.log("Buffer is resizable!");


Resizable ArrayBuffer and growable SharedArrayBuffer
# sec-get-arraybuffer.prototype.resizable

Browser compatibility

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See also