benagastov/nim-wasm-compiler

Nim WASM Compiler is a browser-based tool that lets you write code in a programming language called Nim and run it directly in your web browser, with no server involved and nothing to install. Nim is a compiled language, meaning it normally needs a build chain of tools on your computer before it can produce a runnable program. This project replaces that entire local process with browser-side execution. When you click "Build and Run," the browser runs a four-step chain. First, the Nim compiler (itself compiled to WebAssembly, a low-level format that modern browsers can execute natively) translates your Nim code into C source files. Second, a version of the Clang C compiler, also running in the browser, compiles those C files into object files. Third, the LLD linker, again running in the browser, links those object files into a single WebAssembly module. Fourth, the browser runs that module and shows you the output. A separate "Run Only" button skips compilation and re-executes the previously built result instantly. The demo folder is a fully self-contained static website. You can open the main HTML file directly in a modern browser such as Chrome, Firefox, Edge, or Safari, or serve it with a simple local web server using a one-line Python command. The repository also includes a GitHub Pages workflow so you can deploy the demo to a public URL with a single push. For developers who want a fuller local setup, there is an optional Flask (Python) development server in the source folder, but it is not required for the core demo to work. The project's own glue code and patches are released under the MIT license. The bundled WebAssembly versions of Clang, LLD, and the in-memory filesystem come from a separate open-source project and keep their original licenses. The Nim compiler files are also MIT-licensed.