example-nodejs-compress

const imagemin = require('imagemin');
const imageminJpegtran = require('imagemin-jpegtran');
const fs = require('fs');
/*
 * Attempts to upload an image provided by a user to the server.
 *
 * Makes use of imagemin for image compression to reduce impact on server
 * drive space.
 */
app.post('/uploadImage', function(req, res) {
  if (!session.isAuthenticated) { return res.sendStatus(401); }
  /*
   * Write the raw image to disk.
   */
     fs.writeFileSync(`/images/raw/${req.body.name}.png`, req.body.image);
  /*
   * Compresses a raw image, resulting in an optimized image with lower disk
   * space required.
   */
  const compressImage = async function() {
    const res = await imagemin([`/images/raw/${req.body.name}.png`],
    `/images/compressed/${req.body.name}.jpg`);
    return res;
  };
  /*
   * Compress the image provided by the requester, continue script
   * expecution when compression is complete.
   */
  const res = await compressImage();
  /*
   * Return a link to the compressed image to the client.
   */
  return res.status(200)
    .json({url: `https://media.mega-bank.com/images/${req.body.name}.jpg` });
});