Node.js - Base64エンコード画像を画像ファイルとして保存

Node.js で簡単にできた。

save base64 encoded image

https://gist.github.com/madhums/e749dca107e26d72b64d

 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);