About
This website contains my study notes about Elysia.js, a TypeScript web framework that has significantly improved my development workflow compared to other JavaScript frameworks.
Why Elysia.js?
Elysia.js excels in several areas:
- Developer-friendly request/response handling with minimal code
- Type-safe APIs without verbose boilerplate
- Efficient routing with great performance
- Automatic request validation through schema definitions
- Automatic OpenAPI schema generation
While Elysia.js can feel magical (in both good and bad ways), it's important to understand its behavior:
The good
- Simplified request validation through schema definitions
- Automatic API documentation generation
- End-to-end type safety
- “Wow, you can do this?? That’s magical!”
The challenges
- Understanding the underlying mechanics
- Finding best practices for common patterns (e.g., authentication)
- Dealing with advanced concepts like
derive,resolve,mapResponse,store, and lifecycle hooks - Debugging issues due to the framework's code generation approach
- “What’s going on here?? What kind of magic is this?”
About this project
This Elysia by Example project aims to demystify Elysia.js's “magical” aspects. It is not trying to be a comprehensive guide. Rather, it’s a collection of examples that document surprising or unexpected behaviors I’ve encountered while working with Elysia.js in production applications.
Think of it as a curated list of “gotchas” and learning moments that helps demystify the framework’s behavior. When Elysia.js doesn’t behave the way I expect it to, I create minimal examples to understand and document these edge cases.
The contents of this website are generated from *.example.ts files in the dtinth/elysia-by-example repo.