app.js

const express = require('express')
const bodyParser = require('body-parser')

const app = express()
const port = 8080

app.use(bodyParser.json())

app.get('/health', (req, res) => {
    res.header({ "System-Health": true })
    res.sendStatus(204)
})

app.get("/", (req, res, next) => {
    res.json("You're Connected to our API!")
    res.sendStatus(204)
   })

const fibonacci = n => {
    if (n <= 1) {
        return n
    }
    return fibonacci(n - 1) + fibonacci(n - 2)
}

app.post('/fibonacci', (req, res) => {
    const fibIndex = req.body.index
    res.status(202).json({ index: fibIndex, result: "calculating..." })

    console.log("Fibonacci number:", fibonacci(fibIndex))
})

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