Ratelimit using upstash with nextjs

ratelimit.ts

import { Ratelimit } from '@upstash/ratelimit';
import { Redis } from '@upstash/redis';
import type { NextRequest, NextFetchEvent } from 'next/server';
import { NextResponse } from 'next/server';

type MiddlewareFactory = (middleware: NextMiddleware) => NextMiddleware;

export const withRateLimit: MiddlewareFactory =
next => async (request: NextRequest, _next: NextFetchEvent) => {
    const url = process.env.UPSTASH_REDIS_REST_URL!;
    const token = process.env.UPSTASH_REDIS_REST_TOKEN!;
    const ip = request.ip ?? '127.0.0.1';
    const redis = new Redis({
        url,
        token,
    });

    const ratelimit = new Ratelimit({
        redis,
        limiter: Ratelimit.slidingWindow(10, `10 s`), # 10 requests every 10 seconds
    });
    const { success, limit, reset, remaining } = await ratelimit.limit(ip);

    if (!success) {
        return NextResponse.json({ message: 'Rate limit exceeded' }, { status: 429 });
    }

    return next(request, _next);
};