sendgrid multipart/alternative image from base64 - sendgrid

Question

I can't get Sendgrid (using node.js) to send an email with a embedded base64 image in the html. I think I'm quite close...
var base64img='data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAQgAAAFXCAYAAABeLtDdAAAgAElEQVR4Xu19CXhURdb2ISsJgSQ';//shortened version
sendgrid.send({
to : 'address1#gmail.com',
from : 'address2#gmail.com',
subject : 'email with image from base64 data',
headers:{
'Content-Type':
'multipart/alternative; boundary="imagebase64"'+
'--imagebase64'+
'Content-Type: image/png; name="base64.png"'+
'Content-Disposition: inline; filename="base64.png"'+
'Content-Transfer-Encoding: base64'+
'Content-ID: <0123456789>'+
'Content-Location: base64.png'+
base64img+
'--imagebase64'
},
html : '<img src="cid:0123456789"/>'
});
Can someone help, as I'm failing to find an example close on sendgrid docs or google

Answer 1

FIXED!
var base64img='data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAQgAAAFXCAYAAABeLtDdAAAgAElEQVR4Xu19CXhURdb2ISsJgSQ';//shortened version
var data=base64img.replace(/^data:image\/\w+;base64,/,"");
var buffer=new Buffer(data,'base64');
fs.writeFile('/home/engine/public_html/img/base64img.png',buffer,function(err){
fs.readFile('public_html/img/base64img.png',function(err,data){
sendgrid.send({
to : 'address11#gmail.com',
from : 'address2#gmail.com',
subject : 'email with image from base64 data',
files : [{filename:'base64.png',content:data,cid:'1234567890'}],
html : '<img src="cid:1234567890"/>'
},
function(success,message){
if(!success){console.log(message);}
else{
console.log('sent');
fs.unlink('public_html/img/base64img.png');
}
});});});