Bun

mkdir unkey-with-bun
cd unkey-with-bun
bun init -y

bun install @unkey/ratelimit

UNKEY_ROOT_KEY="YOUR_KEY"

import { Ratelimit } from "@unkey/ratelimit";

/**
This can be a seperate util for easy configurable ratelimiting across
multiple routes.

namespace = The route identifier you would like to ratelimit
limit = The amount of requests
duration = amount of time to limit against for example "30s"

**/
const limiter = new Ratelimit({
  namespace: "bun-example",
  limit: 2,
  duration: "30s",
  rootKey: process.env.UNKEY_ROOT_KEY
})

const server = Bun.serve({
  async fetch(req) {
    const identifier = req.getUserId() // or ip or anything else you want

    const ratelimit = await limiter.limit(identifier)
    if (!ratelimit.success){
      return Response("try again later", { status: 429 })
    }
    return return new Response("Success", { status: 200 });
  },
  port: 8000,
});
console.log(`Listening on ${server.url}`);

bun run index.ts

curl http://localhost:8000