Rate limit your SvelteKit app with Upstash Redis

This blog post offers a detailed guide on implementing rate limiting in a SvelteKit application using Upstash Redis to enhance security for publicly exposed endpoints, particularly those involving resource-intensive operations or external APIs with usage-based billing. The tutorial begins by setting up a SvelteKit project with a form that converts input text to snake case, illustrating the potential for more complex operations. It highlights the necessity of rate limiting to prevent excessive requests, which could incur costs or strain resources, and introduces Upstash's rate limiting SDK that uses a Redis database to track user requests. By integrating rate limiting, the post demonstrates how to restrict users to a defined number of requests within a set time frame using the sliding window strategy and the user's IP address as an identifier. Additionally, the guide explains how to extend this method to cover entire applications or specific routes, suggesting further exploration into Upstash’s documentation for advanced configurations.