How to compile code to run as Node app

[DragonOsman]

I want to compile the C++ code here to WebAssembly and use it in a Node app on the backend, rather than on the frontend since it's a webserver application. I'm reading this right now to try to make sure it's portable enough for WebAssembly (currently reading emscripten-runtime-environment.html ).

My question is: how do I use the WASM module I build in a Node application? Also, what file extension should I specify when giving a value to the -o flag? I'm already working on my compilation flag so I can just copy-paste it when compiling my code to WebAssembly, and right now I have this:

em++ -std=c++17 -Wall -pedantic -D variant_CONFIG_SELECT_VARIANT=variant_VARIANT_NONSTD -s WASM=1 -s DISABLE_EXCEPTION_CATCHING=0 -march=native -I C:/Jinja2Cpp/install_x64/include -I C:/json/single_include -I C:/boost_1_68_0/ currency_converter.cpp -L C:/Jinja2Cpp/install_x64/lib/static -ljinja2cpp -L C:/boost_1_68_0/lib64-msvc-14.1 -lboost_system -lpthread -o currency_converter.wasm --preload-file ../x64/Release/index.html --preload-file ../x64/Release/styles/styles.css ../x64/Release/scripts/scripts.js

Is this alright? Also, can someone point me to a free web host that would except a WebAssembly+Node app as the backend app?