express js backend

backend.js

const express = require('express');
const app = express();
const port = 3000;

let kvs = [
  {
    ccode: 'JS101',
    cname: 'javascript fundamentals'
  },
  {
    ccode: 'RB101',
    cname: 'ruby fundamentals'
  },
  {
    ccode: 'PY101',
    cname: 'python fundamentals'
  }
];

app.use(express.static('public'));
app.use(express.json());

app.get('/courses', (req, res) => {
  res.send(kvs);
});

app.post('/courses', (req, res) => {
  let ob = req.body;
  console.log('[post_rcvd]', ob);
  kvs.push(ob);
  res.send({ status: 'OK' });
});

app.get('/rmcourse/:cid', (req, res) => {
  let courseid = Number(req.params.cid);
  console.log('[del] cid: ', courseid);
  let nkvs = [];
  for(let i = 0; i < kvs.length; i++) {
    if (i !== courseid) {
      nkvs.push(kvs[i]);
    }
  }
  kvs = nkvs;
  res.send({ status: 'OK' });
});

app.listen(port, () => console.log(`server listening on port: ${port}`));