How to Convert nested JSON into excel in nodejs

Question

I'm trying to convert the JSON in the following into an excel document using XLSX, but the nested array of dailyPointsArray is empty after conversion.

Tried code

 const XLSX = require("xlsx");
 const workSheet = XLSX.utils.json_to_sheet(attendanceData);
    const workBook = XLSX.utils.book_new();
    XLSX.utils.book_append_sheet(workBook, workSheet, "attendance");
    XLSX.write(workBook, { bookType: "xlsx", type: "buffer" });
    XLSX.write(workBook, { bookType: "xlsx", type: "binary" });
    XLSX.writeFile(workBook,"newExcel.xlsx");

attendanceData:[
  {
    workerId: '1230',
    workerFullName: 'A',
    workerDepartment: 'INFORMATION TECHNOLOGY',
    workerDesignation: 'ASSISTANT MANAGER',
    Location: 'locationA',
    dailyPointsArray: [
    {
      inTime: '-',
      Date: '23/03/2022',
      outTime: '-',
      Points: null,
      createdAs: 'ABSENT'
    },
    {
      inTime: '-',
      Date: '24/03/2022',
      outTime: '-',
      Points: null,
      createdAs: 'ABSENT'
    }
   ],
    total_duration: 0,
    total_shift_points: 0
  },
  {
    workerId: '1128',
    workerFullName: 'B',
    workerDepartment: 'INFORMATION TECHNOLOGY',
    workerDesignation: 'MANAGER',
    Location: 'LocationA',
    dailyPointsArray: [
    {
      inTime: '-',
      Date: '23/03/2022',
      outTime: '-',
      Points: null,
      createdAs: 'ABSENT'
    },
    {
      inTime: '-',
      Date: '24/03/2022',
      outTime: '-',
      Points: null,
      createdAs: 'ABSENT'
    }
   ],
    total_duration: 17,
    total_shift_points: 2
  },
]

Below is the excel file output 

As you can see the column of dailyPointsArray is empty. I want to my excel file should be like the below image 

Answer 1

Try this:

const filtered = attendanceData.map(obj => {

    // get totals to add them later to keep column order (or use `header` param for columns order)
    const {
        dailyPointsArray,
        total_duration,
        total_shift_points,
        ...rest
    } = obj;

    // flatten..
    dailyPointsArray.map(el => {
        rest[el['Date']] = el.createdAs;
    });

    return {...rest,
        total_duration,
        total_shift_points
    };
});

const XLSX = require("xlsx");
const workSheet = XLSX.utils.json_to_sheet(filtered);
const workBook = XLSX.utils.book_new();
XLSX.utils.book_append_sheet(workBook, workSheet, "attendance");
XLSX.write(workBook, { bookType: "xlsx", type: "buffer" });
XLSX.write(workBook, { bookType: "xlsx", type: "binary" });
XLSX.writeFile(workBook,"newExcel.xlsx");