A small toolkit for converting wasm binaries into json and back.
npm install wasm-json-toolkit
const fs = require('fs')
const wasm2json = require('wasm-json-toolkit').wasm2json
const wasm = fs.readFileSync('./test.wasm')
const json = wasm2json(wasm)
console.log(JSON.stringify(json, null, 2))
Install -g
global for cli usage.
wasm2json [FILE]
given a file containing a wasm module produces a json representation
json2wasm [FILE]
given a file containing a json representation produces a wasm module
converts a wasm binary into a json representation
Parameters
Buffer
- The Webassembly Binaryfilter
-Set
containing the name of sections to parse. If no filter is given all sections will be parsed
Returns Object
converts a json representation to a wasm binary
Parameters
Object
Returns Buffer
converts text to json. The only text accepted is a simple list of opcode name and immediates
Parameters
String
Examples
const codeStr = `
i64.const 1
i64.const 2
i64.add
`
const json = text2json(codeStr)
Returns Object
wast
(module
(func $addTwo (param i32 i32) (result i32)
(i32.add
(get_local 0)
(get_local 1)))
(export "addTwo" (func $addTwo)))
wasm
0x010661646454776f00000a09010700200020016a0b
json
[
{
"name": "preramble",
"magic": [0,97,115,109],
"version": [13,0,0,0]
},
{
"name": "type",
"entries": [
{
"form": "func",
"params": ["i32","i32"],
"return_type": "i32"
}
]
},
{
"name": "function",
"entries": [0]
},
{
"name": "export",
"entries": [
{
"field_str": "addTwo",
"kind": "Function",
"index": 0
}
]
},
{
"name": "code",
"entries": [
{
"locals": [],
"code": [
{
"name": "get_local",
"immediaties": "0"
},
{
"name": "get_local",
"immediaties": "1"
},
{
"return_type": "i32",
"name": "add"
},
{
"name": "end"
}
]
}
]
}
]