svg_to_png.js

app.post('/svg_to_png', async function (req, res) {

  let params = req.body
  let image_url = 'https://s3.amazonaws.com/' + params.s3_bucket + '/' + params.s3_key

  // STEP 1: Convert SVG to PNG:
  var outputBuffer = svg2png.sync(params.svg_data, {});

  // STEP 2: Upload to S3:
  let s3_params = {
      Bucket:params.s3_bucket,
      Key:params.s3_key,
      Body:outputBuffer,
      ContentType:'image/png',
      ContentDisposition:'inline',
      ACL: 'public-read'
  }
  try {
    result = await s3.putObject(params).promise();
    res.send(image_url)
  } catch(err) {
    // return error response
  }

})