Converting WAST into JSON

The wast2json tool reads the WAST format and parses it, checks for errors, and then converts WAST into the JSON file. It generates a JSON and WASM file associated with the WAST file. Then, it links the WASM inside the JSON:

$ /path/to/build/directory/of/wabt/wast2json add.wat -o add.
  json
$ cat add.json
{"source_filename": "add.wat",
"commands": [
{"type": "module", "line": 1, "filename": "add.0.wasm"}]}

To check the various options supported by wast2json, run the following command:

$ /path/to/build/directory/of/wabt/wast2json --help
usage: wast2json [options] filename
 
  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.
 
examples:
  # parse spec-test.wast, and write files to spec-test.json. 
  Modules are
  # written...