Draw Overlay Rectangle Using Node-Canvas.js

app.get('/demo', (req, res) => {
  
  const { createCanvas, loadImage } = require('canvas')
 
  var sizeOf = require('image-size');
 
  var dimensions = sizeOf('sample.jpg');

  const width = dimensions.width;
  const height = dimensions.height;
  const canvas = createCanvas(width, height)
  const ctx = canvas.getContext('2d')
  
   loadImage('landmark.jpg').then((image) => {
    //draw same original image 
    ctx.drawImage(image, 0, 0)  
    // Red rectangle
    ctx.beginPath();
    ctx.lineWidth = "4";
    ctx.strokeStyle = "red";
    //change the data as required
    ctx.rect(125,251,419,317)
    
    //manual line draw , //change the data as required
    //ctx.moveTo(226,126);
    //ctx.lineTo(561,125);
    //ctx.lineTo(561,521);
    //ctx.lineTo(226,521);
    //ctx.lineTo(226,126);
    ctx.stroke();
    res.status(200).send(canvas.toDataURL('jpg,0.4'));
    });
});