create promise array and use axios to wait for all to return

main.js

{/*
  LIVE EXAMPLE:
  https://repl.it/@BarHoring/multiple-http#index.js
*/}

const axios = require('axios');
const fs = require('fs');
const dependencies = [
    "@babel/polyfill",
    "@blueprintjs/select",
    "@emotion/core",
    "@fortawesome/fontawesome-svg-core",
    "@fortawesome/free-brands-svg-icons",
    "@fortawesome/free-regular-svg-icons",]

const baseUri = "https://www.npmjs.com/package/"

const getNpmURI = (dep) => {
    return baseUri + dep
}

{/* will be filled with desired data */}
const result = Array(dependencies.length).fill({})

const linksArray = dependencies.map(dep => getNpmURI(dep))
{/* EXAMPLE:
    linksArray = 
    [
        'https://www.npmjs.com/package/@babel/polyfill',
        'https://www.npmjs.com/package/@blueprintjs/select',
        'https://www.npmjs.com/package/@emotion/core',
        'https://www.npmjs.com/package/@fortawesome/fontawesome-svg-core',
        'https://www.npmjs.com/package/@fortawesome/free-brands-svg-icons',
        'https://www.npmjs.com/package/@fortawesome/free-regular-svg-icons'
    ]
*/}
const promisesArray = linksArray.map(link => axios.get(link))

const getLicense = (htmlString) => {
    const preAnchor = `<h3 class="c84e15be f5 mt2 pt2 mb0 black-50">License</h3>`;
    const anchorStart = `<p class="f2874b88 fw6 mb3 mt2 truncate black-80 f4">`;
    const anchorEnd = `</p>`
    const indexPreAnchor = htmlString.indexOf(preAnchor);
    const indexStart = htmlString.indexOf(anchorStart, indexPreAnchor);
    const indexEnd = htmlString.indexOf(anchorEnd, indexStart);

    // EXAMPLE: substring ~ '<p class="f2874b88 fw6 mb3 mt2 truncate black-80 f4">MIT' 
    const markup = htmlString.substring(indexStart, indexEnd)
    const license = markup.substring(markup.indexOf(">") + 1)
    return license;
}

{/* wait for all to finish */}
axios.all(promisesArray).then(axios.spread((...responses) => {
    for(let i = 0; i < responses.length; i++) {
        const { status, statusText, headers, config, request, data } = responses[i];
        const license = getLicense(data);
        const name = dependencies[i]
        const link = linksArray[i]
        result[i] = {name, license, link }
        // ERROR
        if(status != 200) {
            console.log("error!");
            console.log(JSON.stringify(responses[0]))
        }
    }

})).catch(errors => {
    // react on errors.
    console.log(errors)
  })
  .finally(() => {
      // save as a file
      const data = JSON.stringify(result, null, 4)
      console
       fs.writeFileSync('./deps.txt', data);
    });