Lightweight promise based REST API requests

request.js

class Request {
 constructor(protocol, host, requestHandler, responseHandler) {
  this.protocol = protocol
  this.host = host
  this.requestHandler = requestHandler
  this.responseHandler = responseHandler
 }

 _request(path, method, requestData, headers) {
  return new Promise((resolve, reject) => {
    let req = this.protocol.request(
      {
        method,
        host: this.host,
        path,
        headers
      },
      res => {
	let { statusCode } = res
	if (statusCode >= 400) reject({ response: {}, statusCode })
        let responseData = ""
        res.on("data", chunk => {
          responseData += chunk
        })
        res.on("end", () => {
          resolve({ response: responseData.length > 0 ? this.responseHandler(responseData) : {}, statusCode })
        })
      }
    )
    if (requestData) req.write(this.requestHandler(requestData))
    req.on("error", err => {
      reject(err)
    })
    req.end()
  })
 }

 get(path, headers = {}) {
  return this._request(path, "GET", null, headers)
 }

 post(path, data = {}, headers = {}) {
  return this._request(path, "POST", data, headers)
 }

 put(path, data = {}, headers = {}) {
  return this._request(path, "PUT", data, headers)
 }

 delete(path, headers = {}) {
  return this._request(path, "DELETE", null, headers)
 }
}

module.exports = (host = "localhost", protocol = require("http"), requestHandler = (data) => JSON.stringify(data), responseHandler = (data) => JSON.parse(data)) => new Request(protocol, host, requestHandler, responseHandler)

testRequest.js

const jsonplaceholder = require("./request")("jsonplaceholder.typicode.com", require("https"))

// Async-Await
!(async () => {
 try {
  let { response } = await jsonplaceholder.get("/todos/1")
  console.log(response)
 } catch(e) {
  console.log("Error", e)
 }
})()

!(async () => {
 try {
  let { response } = await jsonplaceholder.post("/posts", { title: "", body: "bar", userId: 1 }, { "Content-type": "application/json" })
  console.log(response)
 } catch(e) {
  console.log("Error", e)
 }
})()

// Promise chaining
jsonplaceholder.get("/todos/1")
 .then(({ response }) => console.log(response))
 .catch(e => console.log("Error", e))

jsonplaceholder.post("/posts", { title: "", body: "bar", userId: 1 }, { "Content-type": "application/json" })
 .then(({ response }) => console.log(response))
 .catch(e => console.log("Error", e))