| WABT(1) | General Commands Manual | WABT(1) |

NAME

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

SYNOPSIS

| wast2json | [options] file |

wast2json Read a file in the wasm spec test format, check it for errors, and convert it to a JSON file and associated wasm binary files.

The options are as follows:

--helpPrint this help message--versionPrint version information-v, --verboseUse multiple times for more info--debug-parserTurn on debugging the parser of wast files--enable-exceptionsEnable Experimental exception handling--disable-mutable-globalsDisable Import/export mutable globals--disable-saturating-float-to-intDisable Saturating float-to-int operators--disable-sign-extensionDisable Sign-extension operators--disable-simdDisable SIMD support--enable-threadsEnable Threading support--enable-function-referencesEnable Typed function references--disable-multi-valueDisable Multi-value--enable-tail-callEnable Tail-call support--disable-bulk-memoryDisable Bulk-memory operations--disable-reference-typesDisable Reference types (externref)--enable-annotationsEnable Custom annotation syntax--enable-code-metadataEnable Code metadata--enable-gcEnable Garbage collection--enable-memory64Enable 64-bit memory--enable-multi-memoryEnable Multi-memory--enable-extended-constEnable Extended constant expressions--enable-allEnable all features-o, --output=FILEoutput JSON file-r, --relocatableCreate a relocatable wasm binary (suitable for linking with e.g. lld)--no-canonicalize-leb128sWrite all LEB128 sizes as 5-bytes instead of their minimal size--debug-namesWrite debug names to the generated binary file--no-checkDon'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

| September 23, 2025 | Debian |