Middleware allows you to customize the behavior of server functions created with createServerFn with things like shared validation, context, and much more. Middleware can even depend on other middleware to create a chain of operations that are executed hierarchically and in order.

More in the official docs: tanstack.com/start/latest/docs/framework/react/mid…

TanStack Router Tutorial:    • TanStack Router Tutorial  
TanStack Start Tutorial:    • TanStack Start Tutorial  

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TIMESTAMPS

00:00 Introduction
00:19 Server Middleware
01:24 Client Middleware
02:25 Passing data between multiple middlewares
03:51 Full Demo
05:05 Returning an error from a server middleware
05:45 Global Middleware
06:18 TanStack Start + Query data loading

#tanstack #react #nextjs