wasm2wat

Disassemble WebAssembly binary to text

TLDR

Convert to WAT

$ wasm2wat [input.wasm]

Output to file

$ wasm2wat [input.wasm] -o [output.wat]

Fold expressions

$ wasm2wat --fold-exprs [input.wasm]

Generate names

$ wasm2wat --generate-names [input.wasm]

SYNOPSIS

wasm2wat [-o output] [--fold-exprs] [options] input

wasm2wat is a disassembler from the WABT (WebAssembly Binary Toolkit) that converts WebAssembly binary (.wasm) files into the human-readable WebAssembly Text Format (WAT). The WAT output uses S-expression syntax that represents the module structure, functions, types, imports, and exports in a readable form.The tool is essential for debugging and inspecting compiled WebAssembly modules, allowing developers to examine the actual instructions generated by compilers. Options like --fold-exprs produce more compact output by nesting expressions, and --generate-names assigns readable names to unnamed functions and variables.Output can be written to a file or printed to stdout for piping to other tools. The reverse operation (text to binary) is performed by the companion tool wat2wasm.

PARAMETERS

-o FILE

Output file.

--fold-exprs

Fold expressions.

--generate-names

Generate names.

--inline-exports

Inline exports.

--help

Show help.

INSTALL

sudo apt install wabt

sudo dnf install wabt

sudo pacman -S wabt

brew install wabt

nix profile install nixpkgs#wabt

CAVEATS

One-way mostly. Part of WABT. Large output for big modules.

HISTORY

wasm2wat is part of WABT (WebAssembly Binary Toolkit), converting binary WASM to readable WAT text format.