1. npm install --save  babel-cli babel-preset-env babel-preset-stage-0

2. create .babelrc 
   {
    "presets": [
        "env","stage-0"
    ]
   }


3. npm install body-parser nodemon 

4. change inistal script in package.json file from test to: 
   "start": "nodemon ./index.js --exec babel-node -e js"

5. what is middleware? 
   ans: middleware are simply functions that have access to the request and response object
        it can make changes to the request response object, can end them, can call another function
        in the stack using next, etcetera

6. test API in POSTMAN
   POST => body => x-www-form-urlencoded    

7. *****************************
  After build of front Edn===
  1. copy build folder to backend folder 
  2. add [ app.use(express.static(path.join(__dirname, '/build'))) ] and 
  [ app.get('*', (req, res) =>{
    res.sendFile(path.join(__dirname + '/build/index.html'));
   })
  ]