Middleware

Logging, auth chains, error handling, and rate limiting.

Logging Middleware

Built-in logging middleware on the base action client that tracks execution time and logs inputs/outputs.

Check the server console for timing logs.

Result:

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Auth Chain

Two chained .use() middleware calls building context: first adds userId, second adds sessionId.

Result:

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Error Handling Middleware

Middleware that catches DatabaseError and transforms it into a user-friendly ActionError.

Result:

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Rate Limiting Middleware

In-memory rate limiter that allows max 5 calls per 10 seconds. Click rapidly to trigger the limit.

Click more than 5 times in 10 seconds to see the rate limit error.

Result:

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