index.js

const express = require('express')
const app = express()
const request = require('request')
const ipl = require('ip-locator')

// default route
app.get('/',(req, res, next) => {
  var myip = req.headers['x-forwarded-for'] || req.connection.remoteAddress
  ipl.getDomainOrIPDetails(myip,'json', function (err, data) {
    var countryCode = data.countryCode

    request('https://api.covid19api.com/total/country/'+countryCode, function (error, response, body) {
      try {
        if (!error && response.statusCode == 200) {
          var data = JSON.parse(body.toString())
          res.json(data[data.length-1])
        }else{
          res.json(error)
        }
      } catch (error) {
        res.json(error)
      }
    })
  })
})

// country code route
app.get('/country/:code',(req, res, next) => {
  var countryCode = req.params.code
  request('https://api.covid19api.com/total/country/'+countryCode, function (error, response, body) {
    try {
      if (!error && response.statusCode == 200) {
        var data = JSON.parse(body.toString())
        res.json(data[data.length-1])
      }else{
        res.json({"status": false, "code": response.statusCode, "message": "Not found"})
      }
    } catch (error) {
      res.json(error)
    }
  })
})

//summary
app.get('/summary', (req, res, next) => {
  try {
    request('https://api.covid19api.com/summary', function (error, response, body) {
      if (!error && response.statusCode == 200) {
        var data = JSON.parse(body.toString())
        res.json(data)
      }else{
        res.json({"status": false, "code": response.statusCode, "message": "Not found"})
      }
    })
  } catch (error) {
    res.json(error)
  }
})

// country list route
app.get('/countries',(req, res, next) => {
  request('https://api.covid19api.com/countries', function (error, response, body) {
    try {
      if (!error && response.statusCode == 200) {
        var data = JSON.parse(body.toString())
        res.json(data)
      }else{
        res.json({"status": false, "code": response.statusCode, "message": "Not found"})
      }
    } catch (error) {
      res.json(error)
    }
  })
})

// day by day
app.get('/days/:code',(req, res, next) => {
  var countryCode = req.params.code
  var isCumulative = req.query.cumulative
  request('https://api.covid19api.com/total/dayone/country/'+countryCode, function (error, response, body) {
    try {
      if (!error && response.statusCode == 200) {
        var data = JSON.parse(body.toString())
  
        // processing data
        if(!isCumulative || isCumulative=="false"){
          let confirmedCount = data[0].Confirmed
          let deathCount = data[0].Deaths
          let recoveredCount = data[0].Recovered
          for(let i=1; i<data.length; i++){
            data[i].Confirmed -= confirmedCount
            confirmedCount += data[i].Confirmed
            data[i].Deaths -= deathCount
            deathCount += data[i].Deaths
            data[i].Recovered -= recoveredCount
            recoveredCount += data[i].Recovered
          }
        }
  
        res.json(data)
      }else{
        res.json({"status": false, "code": response.statusCode, "message": "Not found"})
      }
    } catch (error) {
      res.json(error)
    }
  })
})

// handling invalid routes
app.get('*', (req, res)=>{
  res.json({"status": 404, "message":"Route not found"})
})

// error handling middleware
app.use((e, req, res, next) => {
  res.status(422).send({
      status: false,
      message: e.message

  });
})

app.listen(process.env.PORT || 3000, ()=>{
  console.log("listening for requests")
})