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TanStack Start: Type-Safe Full-Stack React with Server Functions

File routes, loaders and createServerFn: how TanStack Start keeps types flowing from the database to the component.

MasterClass Buddy Editorial

Engineering editorial team · 8 min read ·

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What you will learn
  1. Built on TanStack Router, every route, param and search param is typed.
  2. createServerFn defines server-only code callable from anywhere.
  3. Loaders fetch data before render, with SSR and streaming.

A router-first framework

TanStack Start starts from TanStack Router, which is known for end-to-end type safety: links, params and search params are checked by TypeScript. Start adds server rendering, streaming and server functions on top, built with Vite.

The result feels close to a client-side app with server superpowers rather than a server framework with client islands.

In the rest of this story
  1. Server functions and loaders
  2. A typed posts route
  3. When to choose it
1 code example · 8 min read in full
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MasterClass Buddy Editorial

Engineering editorial team. Contributing deep-dive engineering architectures, cloud paradigms, and system design insights to Master Class Buddy.