Deno/js code to pick 3 random winners from a channel using the Slack API

giveaway.js

// connect to the Slack API
let slack = "https://changelog.slack.com/api"
let token = Deno.env.get("SLACK_TOKEN")
let channel = "C1YNE3WUX"

let url = new URL(`${slack}/conversations.members`)

url.searchParams.set("token", token)
url.searchParams.set("channel", channel)

// get a list of members from the jsparty channel
let response = await fetch(url)
let json = await response.json()
let members = json.members

while (json.response_metadata.next_cursor) {
  url.searchParams.set("cursor", json.response_metadata.next_cursor)
  response = await fetch(url)
  json = await response.json()
  members = members.concat(json.members)
}

console.log(members.length)

// select 3 random people from that list
let luckies = members.sort((a, b) => 0.5 - Math.random()).slice(0, 3)

// resolve user names from ids

url = new URL(`${slack}/users.info`)
url.searchParams.set("token", token)

for (let i = 0; i < luckies.length; i++) {
  url.searchParams.set("user", luckies[i])
  response = await fetch(url)
  json = await response.json()
  console.log(json.user.name)
}

Run with deno run --allow-env --allow-net giveaway.js