[Solved] How to map an object as per key and value using JavaScript?

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You could take an array for the wanted groups and related keys and take an iterative and recursive approach.

var data = [{ _id: "5c407834953d7f420d56f866", allocated_to: "FIELD", zone: "NORTH", state: "DELHI", location: "NEW DELHI", customer_name: "REET INFOTECH", bank_name_of_customer: "YES BANK", cl_contract_id: "LAI-00016881", lk_loan_account_id: "LK0000015094", front_end_manager_name: "SONAL", area_collection_manager: "ASHIS JENA", installment_date: "", collection_manager: "" }, { _id: "5c407834953d7f420d56f867", allocated_to: "FIELD", zone: "NORTH", state: "DELHI", location: "Sree Nagar", customer_name: "REET", bank_name_of_customer: "Corporate BANK", cl_contract_id: "LAI-00016881", lk_loan_account_id: "LK0000015094", front_end_manager_name: "SONAL", area_collection_manager: "ASHIS JENA", installment_date: "", collection_manager: "" }, { _id: "5c407834953d7f420d56f868", allocated_to: "FIELD", zone: "EAST", state: "Odisha", location: "Bhubaneswar", customer_name: "REET", bank_name_of_customer: "PNB BANK", cl_contract_id: "LAI-00016881", lk_loan_account_id: "LK0000015094", front_end_manager_name: "SONAL", area_collection_manager: "ASHIS JENA", installment_date: "", collection_manager: "" }, { _id: "5c407834953d7f420d56f890", allocated_to: "FIELD", zone: "EAST", state: "Assam", location: "Gawhati", customer_name: "REET", bank_name_of_customer: "SBI BANK", cl_contract_id: "LAI-00016881", lk_loan_account_id: "LK0000015094", front_end_manager_name: "SONAL", area_collection_manager: "ASHIS JENA", installment_date: "", collection_manager: "" }],
    groups = [
        ['zone_list', 'zone'],
        ['state_list', 'state'],
        ['location_list', 'location'],
        ['task_list', '_id', 'front_end_manager_name', 'area_collection_manager', 'collection_manager'],
        ['loan_accounts_assigned', 'lk_loan_account_id', 'allocated_to', 'cl_contract_id', 'customer_name', 'bank_name_of_customer']
    ],
    result = data.reduce((r, o) => {
        groups.reduce((t, [group, ...keys]) => {
            var temp = (t[group] = t[group] || []).find(p => o[keys[0]] === p[keys[0]]);
            if (!temp) {
                temp = Object.assign({}, ...keys.map(k => ({ [k]: o[k] })));
                t[group].push(temp);
            }
            return temp;
        }, r);
        return r;
    }, {});
console.log(result);
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solved How to map an object as per key and value using JavaScript?