node.js equivalent of python's if __name__ == '__main__' [duplicate]

Answer 1

if (!module.parent) {
  // this is the main module
} else {
  // we were require()d from somewhere else
}

EDIT: If you use this code in a browser, you will get a "Reference error" since "module" is not defined. To prevent this, use:

if (typeof module !== 'undefined' && !module.parent) {
  // this is the main module
} else {
  // we were require()d from somewhere else or from a browser
}