JavaScript and Node.js guide

export BETTING_DATA_API_KEY=YOUR_API_KEY
node odds.mjs

// Node 18+ (built-in fetch). Never ship your key to a browser.
const API_KEY = process.env.BETTING_DATA_API_KEY;
const BASE = "https://api.bettingdataapi.com";

const url = new URL("/odds/", BASE);
url.search = new URLSearchParams({ sport_key: "basketball_nba", markets: "h2h" });

const resp = await fetch(url, {
  headers: { "x-api-key": API_KEY },
  signal: AbortSignal.timeout(10000),
});

if (!resp.ok) {
  const err = await resp.json().catch(() => ({}));
  throw new Error(`HTTP ${resp.status}: ${err.detail ?? "request failed"}`);
}

const body = await resp.json();
for (const event of body.data) {
  console.log(event.home_team, "vs", event.away_team, event.start_time);
  for (const book of event.books ?? []) {
    console.log("  ", book.book, book.market, book.outcomes.map(o => `${o.name} ${o.price}`).join(", "));
  }
}
console.log("remaining today:", resp.headers.get("x-ratelimit-remaining"));

async function getJson(url, apiKey) {
  const resp = await fetch(url, { headers: { "x-api-key": apiKey } });
  if (resp.status === 429) {
    const wait = Number(resp.headers.get("retry-after") ?? 60);
    const { detail } = await resp.json();
    throw new Error(`Rate limited for ${wait}s: ${detail}`);
  }
  if (!resp.ok) throw new Error(`HTTP ${resp.status}: ${(await resp.json()).detail}`);
  return resp.json();
}