How to read and output jpg image with Node?

To read and output jpg image with Node, we read it with readFile.

For instance, we write

const http = require("http");
const fs = require("fs");

fs.readFile("image.jpg", (err, data) => {
  if (err) {
    throw err;
  }
  http
    .createServer((req, res) => {
      res.writeHead(200, { "Content-Type": "image/jpeg" });
      res.end(data);
    })
    .listen(8080);
});

to call readFile to read the image.jpg file.

And then we call createServer with a callback that calls res.end with the read data to return that as the response.

We call writeHead to write the Content-Type header with the MIME type as its value.