team-big/main.js

var request = new XMLHttpRequest()
request.open(
    "GET",
    "https://cors-proxy.blaseball-reference.com/database/allTeams",
    true)
request.send();

request.onload = function() {
    var teams = JSON.parse(this.response)
    var totals = teams.map(team => team.lineup.length + team.rotation.length)
    // Get all player counts that there are from greatest to least
    var playercounts = totals.slice().sort(function (x, y) {
        return y - x
    }).filter(function (item, pos, array) {
        return !pos || item != array[pos - 1]
    })

    // Now make headers & lists for all the player counts
    playercounts.forEach(function(item) {
        document.body.insertAdjacentHTML("beforeend",
            "<h1>"
            + item 
            + " players</h1><ul id='tlist"
            + item
            + "'></ul>")
    })
    // Put the teams in the lists
    teams.forEach(function(item, pos) {
        document.getElementById("tlist" + totals[pos]).insertAdjacentHTML("beforeend", 
            "<li>" 
            + item.fullName
            + " ("
            + item.lineup.length
            + " hitters, "
            + item.rotation.length
            + " pitchers)</li>")
    })

    document.getElementById("progress").remove()
}