Next.js

import { NextResponse } from 'next/server';
import { Ratelimit } from "@unkey/ratelimit";

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

export const POST = (async (req) => {
  const identifier = getUserId(); // or ip or anything else you want
  const ratelimit = await limiter.limit(identifier)
  if (!ratelimit.success){
   return new NextResponse("Please try again later", {status: 429});
  }

  return new NextResponse('Hello!');
});