title: Is there any rules engine implemented on NodeJS / in Javascript?
body: <p>I need a lightweight rules engine. We have around 50 rules right now, but the rules keep changing frequently.</p>
  
  <p>We could use Drools, but I figure that would be overkill. Are there any lighter, F/OSS implementations? </p>
  
  <p>I am aware of the other similar question, but that is 2 years old and does not have a good answer. (and I do not have enough rep to comment on that question)</p>