Rate Limiter

A simple rate limiter for Express.js

Token Bucket algorithm.

Each client gets a token bucket that refills over time. If no tokens are available, the request is rejected with 429 Too Many Requests.

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Token Bucket -> How It Works

• Each client has a bucket with fixed capacity.
• Tokens refill at a given refillRate.
• Each request consumes 1 token.
• If empty → request is blocked.

Example in server.js:

const tokensPerMinute = 10;
const refillRate = tokensPerMinute / 60;

const tokenBucketLimiter = new TokenBucketLimiter(tokensPerMinute, refillRate);
app.use(createRateLimiter(tokenBucketLimiter));