OhMyVm

OhMyVm is a simple JavaScript virtual machine for node.js powered by Boa JavaScript engine. It is meant to be used for executing untrusted code in a sandboxed environment with little to no access to the host system.

Installation

npm install @ohmyvm/vm

Usage

const { OhMyVm } = require('@ohmyvm/vm');

const vm = new OhMyVm();

const code = Buffer.from(`
function main() {
    return "Hello, World!";
}

main();
`);

const result = vm.eval(code);

// "Hello, World!"
console.log(result);

API

new OhMyVm()

Creates a new instance of the virtual machine.

vm.eval(code: Buffer): string

Evaluates the given code in the virtual machine and returns the result as a string. If the code throws an error, this method will throw an error as well.

get loopIterationLimit: number

The current maximum number of iterations allowed in a loop.

setLoopIterationLimit(limit: number): void

Sets the maximum number of iterations allowed in a loop. Setting this to a fixed number can help prevent infinite loops.

disableLoopIterationLimit(): void

Disables loop iteration limit.

get recursionLimit: number

The current maximum depth of recursion allowed in a function.

setRecursionLimit(limit: number): void

Sets the maximum depth of recursion allowed in a function. Setting this to a fixed number can help prevent stack overflows.

get stackSizeLimit: number

The current maximum stack size allowed for the virtual machine.

setStackSizeLimit(limit: number): void

Sets the maximum stack size allowed for the virtual machine. Setting this to a fixed number can help prevent stack overflows.

setStrictMode(strict: boolean): void

Enables or disables strict mode for the virtual machine.