Porffor rebuilds the JS engine as a compiler: an order of magnitude lighter in memory and binary size.

Porffor is an order of magnitude more memory efficient than other runtimes. On a server with 1GB of memory, Porffor fits over 1 thousand applications under load. 40x Node containers and 25x self-hosted workerd.

JavaScript engines are made for browsers, designed for JS (from a web page) unknown at build-time. Even though server-side JS is known at build-time existing JS runtimes cannot benefit due to their browser engines. Porffor truly compiles JS ahead-of-time like C or Rust, zero interpreting.

Rebuilding the JS engine requires reimplementing the entire language from scratch. Porffor tests against Test262, the official ECMAScript conformance suite. Porffor is alpha and still has a lot to do, but it is improving every commit.

Porffor ships your program as a single file that users just run, as that is how it works. With small apps up to 50x smaller than bundling a runtime like Bun and Deno, such as this React SSR demo:

Porffor compiles through C, so any target with a C compiler can now run JavaScript natively: embedded devices, exotic architectures. It also supports WebAssembly, allowing incredible improvement over existing solutions which embed an interpreter.