WABT(1) General Commands Manual WABT(1)

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

wast2json [options] file

wast2json reads a file in the wasm spec test format, checks it for errors, and converts it to a JSON file and associated wasm binary files.

The options are as follows:

, --verbose
Use multiple times for more info
Print this help message
Turn on debugging the parser of wast files
Enable Experimental exception handling
Disable Import/export mutable globals
Enable Saturating float-to-int operators
Enable Sign-extension operators
Disable SIMD support
Enable Threading support
Enable Multi-value
Enable Tail-call support
, --output=FILE
output wasm binary file
, --relocatable
Create a relocatable wasm binary (suitable for linking with e.g. lld)
Write all LEB128 sizes as 5-bytes instead of their minimal size
Write debug names to the generated binary file
Don't check for invalid modules

Parse spec-test.wast, and write files to spec-test.json. Modules are written to spec-test.0.wasm, spec-test.1.wasm, etc.

$ wast2json spec-test.wast -o spec-test.json

wasm-interp(1), wasm-objdump(1), wasm-stats(1), wasm-strip(1), wasm-validate(1), wasm2c(1), wasm2wat(1), wat-desugar(1), wat2wasm(1), spectest-interp(1)

If you find a bug, please report it at
October 7, 2021 Debian