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There could be various reasons causing the connection to be undefined when attempting to connect to a Redis client from Nuxt 3 middleware. Some possible reasons are:

1. Incorrect configuration: Make sure that you have provided the correct configuration options (such as host, port, password) for connecting to Redis. Also, ensure that the Redis server is running and accessible.

2. Timing issue: It could be possible that the Redis connection has not been established yet, and you are trying to access it before the connection is ready. Try using a callback or async/await function to ensure that the connection is established before accessing the client.

3. Scope issue: If you are declaring the Redis client variable within a function or block, make sure that the scope of the variable is appropriate for accessing it in the middleware. It is recommended to declare the Redis client variable globally or in a shared module.

4. Package dependency issue: Ensure that you have installed the required Redis client package and its dependencies in your project. You can use npm list command to check if the Redis package is installed and its dependencies are up-to-date.