JavaScript Binary Data Manipulating ArrayBuffers with DataViews
Example
DataViews provide methods to read and write individual values from an ArrayBuffer, instead of viewing the entire thing as an array of a single type. Here we set two bytes individually then interpret them together as a 16-bit unsigned integer, first big-endian then little-endian.
var buffer = new ArrayBuffer(2);
var view = new DataView(buffer);
view.setUint8(0, 0xFF);
view.setUint8(1, 0x01);
console.log(view.getUint16(0, false)); // 65281
console.log(view.getUint16(0, true)); // 511
