Show HN: Elysia JIT "Compiler", why it's one of the fastest JavaScript framework
saltyaom Sunday, February 08, 2026
Wrote a thing about what makes Elysia stand out in a performance benchmark game
Basically, there's a JIT "compiler" embedded into a framework
This approach has been used by ajv and TypeBox before for input validation, making it faster than other competitors
Elysia basically does the same, but scales that into a full backend framework
This gave Elysia an unfair advantage in the performance game, making Elysia the fastest framework on Bun runtime, but also faster than most on Node, Deno, and Cloudflare Worker as well, when using the same underlying HTTP adapter
There is an escape hatch if necessary, but for the past 3 years, there have been no critical reports about the JIT "compiler"
What do you think?
Summary
Elysia.js is a just-in-time (JIT) compiler that can significantly improve the performance of JavaScript applications. It accomplishes this by analyzing the code at runtime and generating optimized machine code, leading to faster execution times.
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Summary
elysiajs.com