How to Convert nested JSON into excel in nodejs

0 votes

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 enter image description here

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

Dec 28, 2022 in Others by Kithuzzz
• 27,740 points
150 views

1 answer to this question.

0 votes

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");
answered Dec 28, 2022 by narikkadan
• 51,240 points

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