Validate array of objects in express validator

let arr = [
  {
    user_id:1,
    hours:8
  },
  {
    user_id:2,
    hours:7
  }
]

You can put check like this, note that arr would be the key in the request body. :

check("arr.*.user_id")  
  .not()  
  .isEmpty()

check("arr.*.hours")  
  .not()  
  .isEmpty()