If you want to experience N64 WASM today, here are the key projects (note: none host ROMs for legal reasons; you must supply your own legally obtained dumps):
Running code in a sandboxed browser environment provides a layer of safety that traditional executable emulators cannot always guarantee. The Technical Challenge of N64 Emulation n64 wasm
To understand N64 WASM, one must first understand the environment of the original hardware and the nature of most emulators. The Nintendo 64, released in 1996, utilized a unique architecture centered around the MIPS R4300i CPU. To emulate this hardware, developers have historically written emulators—such as Mupen64Plus or ParaLLEl—in low-level languages like C or C++. These languages offer the direct memory management and performance required to simulate the N64’s complex Reality Coprocessor. If you want to experience N64 WASM today,
: You can find hosted versions of the emulator on platforms like Neil Barkhina's site Load a ROM To emulate this hardware
The Evolution of Web Emulation: From JavaScript to WebAssembly