如何在nodejs中将嵌套的JSON转换为excel答案

【问题标题】：How to Convert nested JSON into excel in nodejs如何在nodejs中将嵌套的JSON转换为excel
【发布时间】：2022-08-11 20:10:00
【问题描述】：

我正在尝试将以下 JSON 转换为 excel，我正在使用XLSX对于它，它正在将我的 JSON 转换为 excel，但是，dailyPointsArray 的嵌套数组在转换为 excel 后是空白的。

试过的代码

 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
  },
]

下面是excel文件输出

如您所见，dailyPointsArray 的列是空的。我想我的 excel 文件应该像下图

标签： javascript node.js excel express xlsx

【解决方案1】：

尝试展平数组：过滤嵌套数组，按您想要的顺序获取您想要的键

尝试这个：

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");

【讨论】：

【解决方案2】：

您还可以使用 typeof 运算符

const mappedArr = attendanceData.map(item => {
   
    if (item.dailyPointsArray == null) {
        item.dailyPointsArray = "";
    } else if (typeof item.dailyPointsArray == "object") {
        item.dailyPointsArray = JSON.stringify(item.dailyPointsArray);
    }
    return {
    ...item,
    item.dailyPointsArray
    }
}

【讨论】：