If you're using Algolia for search from a backend server, rate limiting works differently compared to frontend implementations. Here's what you need to know.
Why standard API key restrictions may not work
In backend implementations, all traffic to Algolia typically originates from a single IP address, the IP of your server. Because of this:
Applying rate limiting via Algolia’s API Key Restrictions could unintentionally impact legitimate user traffic during high-load situations (e.g., bot attacks or traffic spikes).
Algolia cannot distinguish between different end users behind your server's single IP.
Recommended approach: rate limit at the server level
Since Algolia can't handle per-user rate limiting in this setup, any rate limiting or abuse filtering needs to be implemented on your server.
Common approaches include:
Integrating with a web application firewall (WAF)
Tools like Cloudflare, AWS WAF, or Fastly can detect and throttle abusive traffic based on IP, patterns, or behavior.Custom rate limiting logic
Implement per-user limits in your backend using middleware or application logic (e.g., track API calls per IP or session).Bot management tools
Leverage third-party solutions to identify and block bot traffic before it reaches your Algolia integration.
Summary
Algolia API key restrictions are not effective for backend traffic going through a single IP.
Rate limiting should be applied on your server or edge infrastructure.
Use tools like Cloudflare or implement custom logic to manage usage per user or session.