javascript - Rendering a Base64 PNG with Express

Question

My Node.js server has something that looks like the following:

app.get("/api/id/:w", function(req, res) {
    var data = getIcon(req.params.w);
});

Here, data is a string containing a Base64 representation of a PNG image. Is there any way I can send this to a client accessing the route encoded and displayed as an image (e.g. so the URL can be used in an img tag)?

Answer 1

Yes you can encode your base64 string and return it to the client as an image:

server.get("/api/id/:w", function(req, res) {
    var data = getIcon(req.params.w);
    var img = Buffer.from(data, 'base64');

   res.writeHead(200, {
     'Content-Type': 'image/png',
     'Content-Length': img.length
   });
   res.end(img); 
});