[Vuejs]-VueJS – PapaParse get data in console.log but can't output on Screen

The issue might be using the this inside the complete callback function. Try using arrow function instead

complete: (results) => {
   this.cases = results.data;
   console.log(this.cases);
}

Or assign this to another variable and use it inside the function

let self  = this;

complete: function(results) {
   self.cases = results.data;
   console.log(self.cases);
}