# "Engines" in package.json

Setting "engines" in package.json allows to enforce rules for running your application. 


package.json

![raycast-untitled.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1637831753697/ZuRBCrTWa.png)

trying to run `yarn install` or `npm install` will result in an error, if you have different versions of required packages.