Tutorial: How to Build a Rate-Limited Flask API Using Upstash Redis and Python

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A developer tutorial published on DEV Community walks through adding rate limiting to a Python Flask API using Upstash, a managed Redis service with a free tier. Rate limiting prevents servers from being overwhelmed by runaway scripts, scrapers, or buggy clients sending hundreds of requests per second. The guide demonstrates how a single Python decorator can track per-client request counts in Redis and return a 429 Too Many Requests response when a configured limit is exceeded. The setup requires only basic Python and Flask knowledge, a free Upstash account, and the redis-py library, with no local Redis installation needed. Configuration is managed through environment variables, with default settings capping clients at 10 requests per 60-second window.

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