Metarhia script loader, node.js vm wrapper

Create script from string

Script contains object expression. You can use it for configs, network packets, serialization format, etc.

const metavm = require('metavm');

const src = `({ field: 'value' });`;
const ms = metavm.createScript('Example', src);
console.log(ms);

Output:

MetaScript {
  name: 'Example',
  script: Script {},
  context: {},
  exports: { field: 'value' }
}

Script contains function expression. You can use it for api endpoints, domain logic stored in files or database, etc.

const metavm = require('metavm');

const src = `(a, b) => a + b;`;
const ms = metavm.createScript('Example', src);
console.log(ms);

Output:

MetaScript {
  name: 'Example',
  script: Script {},
  context: {},
  exports: [Function]
}

CommonJS format

const metavm = require('metavm');

const src = `module.exports = { field: 'value' };`;
const ms = metavm.createScript('Example', src, {
  type: metavm.MODULE_TYPE.COMMONJS,
});
console.log(ms.exports); // { field: 'value' }

Read script from file

Metarhia format

const metavm = require('metavm');

const ms = await metavm.readScript('./examples/metarhia/simple.js');
console.log(ms.exports);
// { field: 'value', add: [Function: add], sub: [Function: sub] }

CommonJS format

const metavm = require('metavm');

const ms = await metavm.readScript('./examples/cjs/simple.js', {
  type: metavm.MODULE_TYPE.COMMONJS,
});
console.log(ms.exports);
// { field: 'value', add: [Function: add], sub: [Function: sub] }

License & Contributors

Copyright (c) 2020-2025 Metarhia contributors. Metavm is MIT licensed.
Metavm is a part of Metarhia technology stack.