What is Rate Limiting?

1 min read Updated 2026-02-05

A technique to control the number of requests a user can make to an API or service within a time period. Essential for preventing brute force attacks and API abuse.

Understanding Rate Limiting

Rate limiting protects against abuse by restricting how often users can perform actions. Implementation strategies include fixed window, sliding window, token bucket, and leaky bucket algorithms. Limits should be set per endpoint based on expected legitimate usage.

Examples

  • Limiting login attempts to 5 per minute
  • API rate limits of 100 requests per minute
  • Throttling password reset requests
  • Limiting file uploads per hour

How to Prevent

  • Implement rate limiting on all authentication endpoints
  • Use progressive delays for repeated failures
  • Rate limit by IP, user, and API key
  • Return 429 Too Many Requests with Retry-After header
  • Consider using a distributed rate limiter for scaled systems

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