Rate Limiting Next.js API Routes using Upstash Redis

The article provides a detailed guide on implementing rate limiting for Next.js API routes using the Upstash Rate Limit SDK. It begins with setting up a Redis database through Upstash and configuring a Next.js application to deploy on Vercel. The code section demonstrates how to integrate the Upstash libraries to create a rate limiter that restricts API requests to five per five seconds, using identifiers like a constant string, user ID, or IP address for individual limits. The guide also suggests running the application to observe the rate limiting in action and offers possible enhancements such as employing different algorithms like Sliding Window and Token Bucket for smoother rate limiting experiences, utilizing multiple Redis instances for applications in different regions, and securely storing Redis credentials.