index.js

const express=require('express');
const app=express();
const PORT=3200;

const AWS = require('aws-sdk');

// Our default route
app.get('/',(req,res)=>{

    AWS.config.update({
        accessKeyId: "",
        secretAccessKey: ""
      });

      let s3 = new AWS.S3();

      async function getImage(){
        const data =  s3.getObject(
          {
              Bucket: '',
              Key: ""
            }
          
        ).promise();
        return data;
      }

      
      getImage()
      .then((img)=>{
          let image="<img src='data:image/jpeg;base64," + encode(img.Body) + "'" + "/>";
          let startHTML="<html><body></body>";
          let endHTML="</body></html>";
          let html=startHTML + image + endHTML;
        res.send(html)
      }).catch((e)=>{
        res.send(e)
      })

      function encode(data){
          let buf = Buffer.from(data);
          let base64 = buf.toString('base64');
          return base64
      }

})
app.listen(PORT,()=>{
    console.log(`Web Server running on port ${PORT}`);
});