Learn WAT with Real Code Examples
Updated Nov 25, 2025
Performance Notes
WAT produces minimal Wasm binaries
No hidden runtime or GC overhead
Performance matches compiled Wasm from Zig/Rust/Go
Manual stack manipulation enables optimization
Small modules ideal for micro-packages
Security Notes
Wasm isolation protects host environment
Memory access must be bounds-checked
Avoid unsafe offsets in load/store
Verify imported functions from JS
Use CSP + HTTPS when deploying
Monitoring Analytics
Chrome DevTools Wasm debugging
Stack traces via host
Track memory usage via JS
Profile performance with built-in Wasm profiler
Binary size monitoring with wasm-objdump
Code Quality
Keep functions small
Use locals for clarity
Avoid deep stack nesting
Comment memory offsets
Pair WAT with wasm2wat diffing