p-limit.js

import pLimit from "p-limit"
import PromiseBar from "promise.bar"

PromiseBar.enable()

// set concurrency
const limit = pLimit(5)

// create array which we will use to throttle requests
const requests = []
cities.map(async (city) => {
   try {
      city.streets.map((street) => {
        // push all aync action to array as functions
        requests.push(limit(() => street.postHttp()))
      })
   } catch (error) {
      log.error(error)
   }
})
// run the array with limit
await PromiseBar.all(requests)