junicodes

From: https://stackoverflow.com/questions/23150333/html5-javascript-dataurl-to-blob-blob-to-dataurl

//**dataURL to blob**
function dataURLtoBlob(dataurl) {
    var arr = dataurl.split(','), mime = arr[0].match(/:(.*?);/)[1],
        bstr = atob(arr[1]), n = bstr.length, u8arr = new Uint8Array(n);
    while(n--){
        u8arr[n] = bstr.charCodeAt(n);
    }
    return new Blob([u8arr], {type:mime});

junicodes

<?php

namespace App\Http\Controllers;

use Validator;
use App\User;
use Firebase\JWT\JWT;
use Illuminate\Http\Request;
use Firebase\JWT\ExpiredException;
use Illuminate\Support\Facades\Hash;