Learn WASMTIME with Real Code Examples

Install Wasmtime CLI (via curl, brew, apt, etc.)

Install Rust or other host language SDKs

Compile code to Wasm (Rust, C, Zig, Swift, Go, etc.)

Use `wasmtime run module.wasm` to execute

Integrate with host program via Wasmtime API

Install Wasmtime

Install Rust/Zig/Go toolchains

Set Wasm target (wasm32-wasi)

Configure WASI module

Run CLI or embedding tests

.cargo/config.toml for Wasm builds

Module manifest (WIT/component model)

wasmtime.toml for runtime config

build scripts for AOT

Host app configuration

wasmtime run module.wasm

wasmtime compile module.wasm -o module.cwasm

wasmtime serve module.wasm

wasmtime inspect module.wasm

wasmtime component new

UTF-8 text support

WASI handles locale-neutral APIs

Language-specific i18n handled inside Wasm module

Portable string encoding

No OS locale dependencies

CLI accessibility depends on host

WASI stdout integrates with screen readers

Design focused on backend compute

Sandboxing ensures safe execution for all users

Component model ensures consistent APIs

Not applicable (no GUI)

Text-based TUI output via WASI

Host can provide custom UI bindings

Used mostly for backend/compute

Web UI only via embedding environment

Wasm modules isolated in their own memory

Host passes state via imports or memory

WASI sandbox limits access

Component model handles structured state

Deterministic state for reproducible runs

Linear memory for Wasm

WASI file/IO APIs

Shared-nothing isolation

Host functions for structured data

Component model canonical ABI