json - 如何使用 Node.js 将 JSON 数组转换为 CSV？

Question

我想转换具有值数组的 json。response.json

{
"rows": [
[
  "New Visitor",
  "(not set)",
  "(not set)",      
  "0"
],
[
  "New Visitor",
  "(not set)",
  "(not set)",
  "mobile"      
],
[
  "New Visitor",
  "(not set)",
  "(not set)",
  "mobile"    
],
  [
    "New Visitor",
    "(not set)",
    "(not set)",
   "mobile",      
  ]
 ]
}

现在我想将此数据转换为。name.csv

 "New Visitor","(not set)","(not set)","0"
 "New Visitor","(not set)","(not set)","mobile"        
 "New Visitor","(not set)","(not set)","mobile"    
 "New Visitor","(not set)","(not set)","mobile"

请给我使用 Node.js 的建议。

Answer 1

像这样自己做:

'use strict';

var fs = require('fs');

let myObj = {
  "rows": [
    [
      "New , Visitor",
      "(not set)",
      "(not set)",
      "0"
    ],
    [
      "New Visitor",
      "(not set)",
      "(not set)",
      "mobile"
    ],
    [
      "New Visitor",
      "(not set)",
      "(not set)",
      "mobile"
    ],
    [
      "New Visitor",
      "(not set)",
      "(not set)",
      "mobile",
    ]
  ]
}

// 1. One way - if you want the results to be in double quotes and you have comas inside

// choose another string to temporally replace commas if necessary
let stringToReplaceComas = '!!!!';

myObj.rows.map((singleRow) => {
  singleRow.map((value, index) => {
    singleRow[index] = value.replace(/,/g, stringToReplaceComas);
  })
})

let csv = `"${myObj.rows.join('"\n"').replace(/,/g, '","')}"`;
// // or like this
// let csv = `"${myObj.rows.join('"\n"').split(',').join('","')}"`;

csv = csv.replace(new RegExp(`${stringToReplaceComas}`, 'g'), ',');

// // 2. Another way - if you don't need the double quotes in the generated csv and you don't have comas in rows' values
// let csv = myObj.rows.join('\n')

fs.writeFile('name.csv', csv, 'utf8', function(err) {
  if (err) {
    console.log('Some error occured - file either not saved or corrupted file saved.');
  } else {
    console.log('It\'s saved!');
  }
});

使用库

例如。 https://github.com/mrodrig/json-2-csv , https://github.com/wdavidw/node-csv , https://github.com/wdavidw/node-csv-stringify

使用 json-2-csv (https://github.com/mrodrig/json-2-csv) 的示例

'use strict';

const converter = require('json-2-csv');

let myObj = {
  "rows": [
    {
      value1: "New Visitor",
      value2: "(not set)",
      value3: "(not set)",
      value4: "0"
    },
    {
      value1: "New Visitor",
      value2: "(not set)",
      value3: "(not set)",
      value4: "mobile"
    },
    {
      value1: "New Visitor",
      value2: "(not set)",
      value3: "(not set)",
      value4: "mobile"
    },
    {
      value1: "New Visitor",
      value2: "(not set)",
      value3: "(not set)",
      value4: "mobile",
    }
  ]
}

let json2csvCallback = function (err, csv) {
    if (err) throw err;
    fs.writeFile('name.csv', csv, 'utf8', function(err) {
      if (err) {
        console.log('Some error occured - file either not saved or corrupted file saved.');
      } else {
        console.log('It\'s saved!');
      }
    });
};

converter.json2csv(myObj.rows, json2csvCallback, {
  prependHeader: false      // removes the generated header of "value1,value2,value3,value4" (in case you don't want it)
});

使用 csv-stringify 的示例 (https://github.com/wdavidw/node-csv-stringify)

'use strict';

var stringify = require('csv-stringify');
var fs = require('fs');

let myObj = {
  "rows": [
    [
      "New Visitor",
      "(not set)",
      "(not set)",
      "0"
    ],
    [
      "New Visitor",
      "(not set)",
      "(not set)",
      "mobile"
    ],
    [
      "New Visitor",
      "(not set)",
      "(not set)",
      "mobile"
    ],
    [
      "New Visitor",
      "(not set)",
      "(not set)",
      "mobile",
    ]
  ]
}

stringify(myObj.rows, function(err, output) {
  fs.writeFile('name.csv', output, 'utf8', function(err) {
    if (err) {
      console.log('Some error occured - file either not saved or corrupted file saved.');
    } else {
      console.log('It\'s saved!');
    }
  });
});