Download JSON file from webpage

download.js

function date(){
    var date = new Date();
    return date.toISOString().substr(0,10); 	
}


function download(content, filename, contentType) {
    if(!contentType) contentType = 'application/octet-stream';
        var a = document.createElement('a');
        var blob = new Blob([content], {'type':contentType});
        a.href = window.URL.createObjectURL(blob);
        a.download = filename;
        a.click();
}

my_data = {
  key:         "value",
  another_key: [1,2,3,4,5,6,7,8,9,0]
}

download(JSON.stringify(my_data), "json_data_" + date() + ".json", "application/json")