Piston X86-64 Assembler (PASM) is NASM syntax based symbolic machine code compiler for X86-64 architecture - fully working in browser and in Node.js based environments. Test live demo
Releases are available for download from GitHub.
Alternatively, you can install using Node Package Manager (npm):
npm install pasm
Usage:
pasm simple.asm
So far its been tested in FF12, Chrome 23 and Safari 6. Usage:
<script type="text/javascript" src="pasm.min.js"></script>
<script type="text/javascript">
// Define where to show errors
myError = function(err, line) {
console.log('Error:' + err + ' in line ' + line);
};
window.Opcode.error = myError;
pasm.parseError = myError;
// Parse assembler code
var hexString = pasm.parse('mov ax, 0x4c00');
console.log(hexString.data);
</script>