Get json from Array of objects

array-to-json.js

Array.prototype.toJson = function(name, value = name) {
  return this.reduce((acc, cur) => {
      acc[cur[name]] = cur[value];
      return acc;
    }, {});
}

/** Test **/
const form = [
    { name: 'firstname', flex: 1, value: 'test1' },
    { name: 'lastname', flex: 1,  value: 'test2' },
    { name: 'email' ,  value: 'test3'},
    { name: 'message' },
  ];
  
console.log(form.toJson('name', 'value'));