You can use FileReader to read the Blob as an ArrayBuffer. Here’s a short example: var arrayBuffer; var fileReader = new FileReader(); fileReader.onload = function(event) { arrayBuffer = event.target.result; }; fileReader.readAsArrayBuffer(blob); Here’s a longer example: // ArrayBuffer -> Blob var uint8Array = new Uint8Array([1, 2, 3]); var arrayBuffer = uint8Array.buffer; var blob = new Blob([arrayBuffer]); … Read more
Try this: function _base64ToArrayBuffer(base64) { var binary_string = window.atob(base64); var len = binary_string.length; var bytes = new Uint8Array(len); for (var i = 0; i < len; i++) { bytes[i] = binary_string.charCodeAt(i); } return bytes.buffer; }
Instances of Buffer are also instances of Uint8Array in node.js 4.x and higher. Thus, the most efficient solution is to access the buf.buffer property directly, as per https://stackoverflow.com/a/31394257/1375574. The Buffer constructor also takes an ArrayBufferView argument if you need to go the other direction. Note that this will not create a copy, which means that … Read more
function _arrayBufferToBase64( buffer ) { var binary = ”; var bytes = new Uint8Array( buffer ); var len = bytes.byteLength; for (var i = 0; i < len; i++) { binary += String.fromCharCode( bytes[ i ] ); } return window.btoa( binary ); } but, non-native implementations are faster e.g. https://gist.github.com/958841 see http://jsperf.com/encoding-xhr-image-data/6 Updated benchmarks: https://jsben.ch/wnaZC
Update 2016 – five years on there are now new methods in the specs (see support below) to convert between strings and typed arrays using proper encoding. TextEncoder The TextEncoder represents: The TextEncoder interface represents an encoder for a specific method, that is a specific character encoding, like utf-8, iso-8859-2, koi8, cp1261, gbk, … An … Read more