example.js

const dayjs = require("dayjs");

const data = {
  result: {
    farmName: "Whitecreek Farm",
    farmInfo: [
      {
        id: 1,
        date: "22/02/2020",
        type: "icon--reciept",
        name: "ForFarmers Ltd",
        additive: "Bovaer®",
        kg: "5"
      },
      {
        id: 2,
        date: "08/02/2020",
        type: "icon--reciept",
        name: "ForFarmers Ltd",
        additive: "Bovaer®",
        kg: "2"
      },
      {
        id: 3,
        date: "17/01/2020",
        type: "icon--download",
        name: "ForFarmers Ltd",
        additive: "Bovaer®",
        kg: "10"
      },
      {
        id: 4,
        date: "08/01/2020",
        type: "icon--reciept",
        name: "Farming World TM",
        additive: "Bovaer",
        kg: "4"
      },
      {
        id: 5,
        date: "02/01/2020",
        type: "icon--reciept",
        name: "ForFarmers Ltd",
        additive: "Bovaer®",
        kg: "8"
      },
      {
        id: 6,
        date: "23/12/2019",
        type: "icon--reciept",
        name: "ForFarmers Ltd",
        additive: "Bovaer®",
        kg: "16"
      },
      {
        id: 7,
        date: "15/12/2019",
        type: "icon--download",
        name: "Farming World TM",
        additive: "Bovaer®",
        kg: "10"
      },
      {
        id: 8,
        date: "08/12/2019",
        type: "icon--download",
        name: "ForFarmers Ltd",
        additive: "Bovaer®",
        kg: "7"
      },
      {
        id: 9,
        date: "29/11/2019",
        type: "icon--reciept",
        name: "ForFarmers Ltd",
        additive: "Bovaer®",
        kg: "8"
      },
      {
        id: 10,
        date: "21/11/2019",
        type: "icon--reciept",
        name: "ForFarmers Ltd",
        additive: "Bovaer®",
        kg: "10"
      },
      {
        id: 11,
        date: "15/11/2019",
        type: "icon--download",
        name: "Farming World TM",
        additive: "Bovaer®",
        kg: "2"
      },
      {
        id: 231,
        date: "22/02/2020",
        type: "icon--reciept",
        name: "ForFarmers Ltd",
        additive: "Bovaer®",
        kg: "5"
      },
      {
        id: 232,
        date: "08/02/2020",
        type: "icon--reciept",
        name: "ForFarmers Ltd",
        additive: "Bovaer®",
        kg: "2"
      },
      {
        id: 233,
        date: "17/01/2020",
        type: "icon--download",
        name: "ForFarmers Ltd",
        additive: "Bovaer®",
        kg: "10"
      },
      {
        id: 234,
        date: "08/01/2020",
        type: "icon--reciept",
        name: "Farming World TM",
        additive: "Bovaer",
        kg: "4"
      },
      {
        id: 235,
        date: "02/01/2020",
        type: "icon--reciept",
        name: "ForFarmers Ltd",
        additive: "Bovaer®",
        kg: "8"
      },
      {
        id: 236,
        date: "23/12/2019",
        type: "icon--reciept",
        name: "ForFarmers Ltd",
        additive: "Bovaer®",
        kg: "16"
      },
      {
        id: 9064781,
        date: "22/02/2020",
        type: "icon--reciept",
        name: "ForFarmers Ltd",
        additive: "Bovaer®",
        kg: "5"
      },
      {
        id: 9064782,
        date: "08/02/2020",
        type: "icon--reciept",
        name: "ForFarmers Ltd",
        additive: "Bovaer®",
        kg: "2"
      },
      {
        id: 9064783,
        date: "17/01/2020",
        type: "icon--download",
        name: "ForFarmers Ltd",
        additive: "Bovaer®",
        kg: "10"
      },
      {
        id: 9064784,
        date: "08/01/2020",
        type: "icon--reciept",
        name: "Farming World TM",
        additive: "Bovaer",
        kg: "4"
      },
      {
        id: 9064785,
        date: "02/01/2020",
        type: "icon--reciept",
        name: "ForFarmers Ltd",
        additive: "Bovaer®",
        kg: "8"
      },
      {
        id: 9064786,
        date: "23/12/2019",
        type: "icon--reciept",
        name: "ForFarmers Ltd",
        additive: "Bovaer®",
        kg: "16"
      }
    ]
  }
};

const withDateObj = data.result.farmInfo.map(i => {
  const [day, month, year] = i.date.split("/");
  return { ...i, date: dayjs(`${year}-${month}-${day}`) };
});

const grouped = withDateObj.reduce((acc, next) => {
  const key = next.date.format("YYYY-MM");
  acc[key] = acc[key] || [];
  acc[key].push(next);

  return acc;
}, {});

// console.log(JSON.stringify(grouped, null, 4));

const months = Object.keys(grouped);

const result = months.map(month => {
  console.log("start month:", month);
  const items = grouped[month];
  items.map(item => {
    console.log(item);
  });
  return items;
});

// console.log(JSON.stringify(result, null, 4));