save base64 encoded image

base64-image-upload.js

/* 
 * Taken from http://stackoverflow.com/questions/5867534/how-to-save-canvas-data-to-file/5971674#5971674
 */

var fs = require('fs');
// string generated by canvas.toDataURL()
var img = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0"
    + "NAAAAKElEQVQ4jWNgYGD4Twzu6FhFFGYYNXDUwGFpIAk2E4dHDRw1cDgaCAASFOffhEIO"
    + "3gAAAABJRU5ErkJggg==";
// strip off the data: url prefix to get just the base64-encoded bytes
var data = img.replace(/^data:image\/\w+;base64,/, "");
var buf = new Buffer(data, 'base64');
fs.writeFile('image.png', buf);

thanks

very good!

how to save this image in excel? Thanks Padam

I got a Buffer deprecated warning in NodeJS. I replaced with Buffer.from and it work. Also fixed a callback function warning:

// string generated by canvas.toDataURL()
    var img = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0"
        + "NAAAAKElEQVQ4jWNgYGD4Twzu6FhFFGYYNXDUwGFpIAk2E4dHDRw1cDgaCAASFOffhEIO"
        + "3gAAAABJRU5ErkJggg==";
    // strip off the data: url prefix to get just the base64-encoded bytes
    var data = img.replace(/^data:image\/\w+;base64,/, "");
    var buf = new Buffer.from(data, 'base64');
    fs.writeFile('image.png', buf, err => {
        if (err) throw err;
        console.log('Saved!');
    });

is it secure?

this is great

why do I always have error "Buffer is not defined"??