How to add SSL on my NODE EXPRESS UBUNTU SERVER [closed] - node.js

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Hi Please help to add ssl in node express app:
already add CERTBOT and create key.pem, cert.pem chain.pem.
this is my server.js file..
`require('express-async-errors')
require('dotenv').config()
const cors = require('cors')
const bodyParser = require('body-parser')
const morgan = require('morgan')
const mongoose = require('mongoose')
const producerRouter = require('./routes/producer')
const locationRouter = require('./routes/location')
const dataRouter = require('./routes/dataEntry')
const authRouter = require('./routes/auth')
const express = require('express')
const PORT = process.env.PORT || 3001
const api = process.env.API_URL
const app = express()
// Socket.io
const server = require('http').createServer(app)
const socketHandler = require('./controllers/socketHandler');
const io = socketHandler.socketHandler(server);
app.use(cors())
app.options('\*', cors())
app.use(express.json({limit: "20mb", extended: true}))
app.use(express.urlencoded({limit: "10mb", extended: true, parameterLimit: 50000}))
// middleware
app.use(bodyParser.json())
app.use(morgan('tiny'))
console.log(api)
console.log(`${api}/items`)
// authTokens
const publicUsersToken = require('./middleware/publicUsersAuthToken')
const producersToken = require('./middleware/producerAuthToken')
// Routes
// app.use(`${api}/producers`, producerRouter)
app.use(`/locations`, locationRouter)
app.use(`/cropTypes`, cropTypeRouter)
app.use(`/users`, userRouter)
app.use(`/items`, itemRouter)
app.use(`/marketItems`, marketItemRouter)
// app.use(`${api}/orders`, orderRouter)
app.use(`/dataEntries`, dataRouter)
app.use(`/districts`, districtRouter)
// CONNECTION_STRING
// MY_DB
mongoose.connect(process.env.CONNECTION_STRING, {
useNewUrlParser: true,
useUnifiedTopology: true,
dbName: 'agritech'
}
).then(() =\> {
console.log('Database Connection is ready')
}).catch((err) =\> {
console.log(err)
})
server.listen(PORT, () =\> {
console.log(`Server listening on http://localhost:${PORT}`)
})
convertOrdersSchedule();`
I want to install ssl on Express Backend APIs on ubuntu : MY_IP:3001 (https://123.12.1.1:3001)
Above I have given working server.js file, Please tell me what should I add in it so that the ssl will work.