fetchAll.js

const fetch = require("node-fetch")

const fetchAll = async function(urls, max=3) {
    const results = Array(urls.length)
    const workers = Array(max)
    const index = {value:0}

    for (let i=0; i<max; ++i) {
        workers.push(fetchAll.worker(urls, results, index))
    }

    await Promise.all(workers)

    return results
}

fetchAll.worker = async function(urls, results, index) {
    while (index.value < urls.length) {
        const url = urls[index.value]
        results[index.value++] = await fetch(url)
            .then(r => r.json())
            .catch(_ => null) // no need to keep error in this example
    }
}

const needUrls = 60
const urls = Array.from(Array(needUrls), (_,i) =>
    `https://jsonplaceholder.typicode.com/todos/${i+1}`)

fetchAll(urls).then(console.log)