WABT: The WebAssembly Binary Toolkit

You can install The WebAssembly Binary Toolkit with:

wapm install wabt

wabt includes commands like:

• wat2wasm
• wasm2wat
• wast2json
• wasm-validate
• wasm-strip

Commands

wat2wasm

Translate from WebAssembly text format to the WebAssembly binary format.

# parse and typecheck test.wat
$ wapm run wat2wasm test.wat

# parse test.wat and write to binary file test.wasm
$ wapm run wat2wasm test.wat -o test.wasm

# parse spec-test.wast, and write verbose output to stdout (including the
# meaning of every byte)
$ wapm run wat2wasm spec-test.wast -v

wasm2wat

The inverse of wat2wasm, translate from the binary format back to the text format (also known as a .wat).

# parse and typecheck test.wat
$ wapm run wat2wasm test.wat

# parse test.wat and write to binary file test.wasm
$ wapm run wat2wasm test.wat -o test.wasm

# parse spec-test.wast, and write verbose output to stdout (including the
# meaning of every byte)
$ wapm run wat2wasm spec-test.wast -v

wasm-validate

Validate a file in the WebAssembly binary format

# Validates the WebAssembly file
$ wapm run wasm-validate test.wasm

wasm-strip

Remove sections of a WebAssembly binary file

# Validates the WebAssembly file
$ wapm run wasm-strip test.wasm

wast2json

wast2json converts a file in the wasm spec test format to a JSON file and associated wasm binary files

# parse spec-test.wast, and write files to spec-test.json. Modules are written
# to spec-test.0.wasm, spec-test.1.wasm, etc.
$ wapm run wast2json spec-test.wast -o spec-test.json

Building from Source

1. Run ./scripts/build_wasi.sh