Do I need API gateway rate limiting or can the app handle it?

You usually want both, but for different reasons.

Short answer

• Yes, the app can handle rate limiting if you only need simple, internal protection and you control all clients.
• Use API gateway rate limiting if you need:
  • protection before traffic reaches your app
  • consistent enforcement across multiple services
  • protection against bursts, abuse, or accidental traffic spikes
  • easy throttling for public APIs

Why gateway rate limiting is often better

An API gateway can stop bad traffic:

• before it consumes app compute, DB connections, or downstream resources
• more cheaply than having your app process the request first
• consistently, even if you have multiple app instances

It’s especially useful for:

• public-facing APIs
• multi-tenant systems
• APIs with third-party consumers
• protecting expensive endpoints

When app-level rate limiting is enough

Your app may be sufficient if:

• the API is internal or low traffic
• you only have one service
• you need custom per-user logic that the gateway can’t easily do
• you’re already using another front layer that throttles traffic
• you want rate limiting tightly coupled to business rules

Best practice

A common pattern is:

1. Gateway rate limiting for broad protection and abuse control
2. App-level checks for fine-grained/business-specific limits

Example:

• Gateway: 100 requests/minute per IP or API key
• App: 10 expensive report generations/day per user

Rule of thumb

• Public API? Use gateway rate limiting.
• Internal app only? App-side may be fine.
• Need defense in depth? Do both.

If you want, I can help you decide based on your setup (cloud provider, traffic volume, and whether the API is public or internal).