【发布时间】：2019-10-27 07:00:42
【问题描述】：
我想将 JSON 响应转换为 CSV 格式。我能够弄清楚如何以将键的父级附加在一起以生成正确的标头的方式正确生成标头。我遇到的问题是构建与每一行对应的数据。例如，假设我有这些名为id、tags 和friends_id 的列。以id = 1, tags = [car, plane] friends_id = [0,1,2] 为例。它应该看起来像 csv 表格格式。
+-------+-------+------------+
| id | tags | friends_id |
+-------+-------+------------+
| 1 | car | 0 |
+-------+-------+------------+
| empty | plane | 1 |
+-------+-------+------------+
| empty | empty | 2 |
+-------+-------+------------+
| 2 | ... | ... |
+-------+-------+------------+
这是我正在处理的一些测试数据。
{
"_id": "5cfe7d3c6deeeef08ce0444b",
"name": "Debra Milligain",
"phone": "+1 (906) 432-2182",
"address": "676 Merit Court, Steinhatchee, Oregon, 5491",
"tags": [
"consequat",
"reprehenderit",
"amet"
],
"Work": {
"skills": [{
"id": 0,
"name": "Programming"
},
{
"id": 1,
"name": "Business"
}
]
},
"friends": [{
"id": 0,
"name": "Stafford Hernandez"
},
{
"id": 1,
"name": "Colleen Christensen"
},
{
"id": 2,
"name": "Barker Keith"
}
],
"greeting": [],
"favoriteFruit": "banana"
}
以下代码（这是我之前遇到的问题的解决方案，发现 here 是我用来将标头递归生成到映射或哈希表中并附加其相应值的代码。
var arrayOfHeaders = {};
var headerDirectory = "";
var rootLevel = true;
var temp = ""
var firstWalkthrough = true;
function traverseJSON(obj){
for (var o in obj) {
if (typeof obj[o] == "object") {
//console.log("Before traversal ", o)
//console.log("Traversing the object: ", obj[o])
if(!isNaN(o)){
//console.log("Current position is a number ", o)
}else{
console.log("Adding to directory... " , o)
headerDirectory += (headerDirectory == "") ? o : "_" + o;
}
rootLevel = false;
if (firstWalkthrough){
firstWalkthrough = false;
//if (o == 0)
rootLevel = true;
}
traverseJSON(obj[o]);
rootLevel = true;
temp = headerDirectory;
headerDirectory = "";
} else {
if (rootLevel) {
if(isNaN(o)){
headerDirectory = "";
//console.log("Has value and is root ", o, "and temp ", temp)
arrayOfHeaders[o] += ",\"" + obj[o] + "\"";
}else{
arrayOfHeaders[headerDirectory+"_"+o] += ",\"" + obj[o] + "\"";
}
}
else {
//console.log("Has value and is not root ", o)
//console.log("Current Header Directory " + headerDirectory)
//console.log("Saved temp : ", temp)
if(isNaN(o)){
if(headerDirectory == "") headerDirectory = temp;
//arrayOfHeaders.push(headerDirectory + "_" + o)
arrayOfHeaders[headerDirectory + "_" + o] += ",\"" + obj[o] + "\"";
}
}
}
}
// console.log("Array of Headers : ", arrayOfHeaders)
}
这是来自 arrayofHeaders 的实际响应：
{ _id: 'undefined,"5cfe7d3c6deeeef08ce0444b"',
name: 'undefined,"Debra Milligain"',
phone: 'undefined,"+1 (906) 432-2182"',
address: 'undefined,"676 Merit Court, Steinhatchee, Oregon, 5491"',
tags_0: 'undefined,"consequat"',
tags_1: 'undefined,"reprehenderit"',
tags_2: 'undefined,"amet"',
'Work_skills_id-skill': 'undefined,"0","Business"',
'Work_skills_name-skill': 'undefined,"Programming"',
'friends_id-friends': 'undefined,"0","1","2"',
'friends_name-friends':
'undefined,"Stafford Hernandez","Colleen Christensen","Barker Keith"',
favoriteFruit: 'undefined,"banana"' }
我想以一种易于循环和生成这样的 csv 的方式来构造数据。问题是我不确定如何从上面跳到下面。
+--------------------------+-----------------+-------------------+---------------------------------------------+---------------+------------------------+--------------------------+---------------------+-----------------------+---------------+
| _id | name | phone | address | tags | Work__skills__id-skill | Work__skills__name-skill | friends__id-friends | friends__name-friends | favoriteFruit |
+--------------------------+-----------------+-------------------+---------------------------------------------+---------------+------------------------+--------------------------+---------------------+-----------------------+---------------+
| 5cfe7d3c6deeeef08ce0444b | Debra Milligain | +1 (906) 432-2182 | 676 Merit Court, Steinhatchee, Oregon, 5491 | consequat | 0 | Programming | 0 | Stafford Hernandez | banana |
+--------------------------+-----------------+-------------------+---------------------------------------------+---------------+------------------------+--------------------------+---------------------+-----------------------+---------------+
| | | | | reprehenderit | Business | | 1 | Colleen Christensen | |
+--------------------------+-----------------+-------------------+---------------------------------------------+---------------+------------------------+--------------------------+---------------------+-----------------------+---------------+
| | | | | amet | | | 2 | Barker Keith | |
+--------------------------+-----------------+-------------------+---------------------------------------------+---------------+------------------------+--------------------------+---------------------+-----------------------+---------------+
编辑： El Tom - 可能修复您的代码
var arrayOfHeaders = {};
var headerDirectory = "";
var rootLevel = true;
var temp = ""
var firstWalkthrough = true;
traverseJSON(
JSON.parse('{"_id": "5cfe7d3c6deeeef08ce0444b","name": "Debra Milligain","phone": "+1 (906) 432-2182","address": "676 Merit Court, Steinhatchee, Oregon, 5491","tags": ["consequat","reprehenderit","amet"],"Work": {"skills": [{"id": 0,"name": "Programming"},{"id": 1,"name": "Business"}]},"friends": [{"id": 0,"name": "Stafford Hernandez"},{"id": 1,"name": "Colleen Christensen"},{"id": 2,"name": "Barker Keith"}],"greeting": [],"favoriteFruit": "banana"}')
)
function traverseJSON(obj) {
for (var o in obj) {
if (typeof obj[o] == "object") {
//console.log("Before traversal ", o)
//console.log("Traversing the object: ", obj[o])
if (!isNaN(o)) {
//console.log("Current position is a number ", o)
} else {
console.log("Adding to directory... ", o)
headerDirectory += (headerDirectory == "") ? o : "_" + o;
}
rootLevel = false;
if (firstWalkthrough) {
firstWalkthrough = false;
//if (o == 0)
rootLevel = true;
}
traverseJSON(obj[o]);
rootLevel = true;
temp = headerDirectory;
headerDirectory = "";
} else {
if (rootLevel) {
if (isNaN(o)) {
headerDirectory = "";
//console.log("Has value and is root ", o, "and temp ", temp)
if (arrayOfHeaders[o] !== undefined) {
arrayOfHeaders[o].push(obj[o]);
} else {
arrayOfHeaders[o] = [obj[o]];
}
} else {
if (arrayOfHeaders[headerDirectory + "_" + o] !== undefined) {
arrayOfHeaders[headerDirectory + "_" + o].push(obj[o]);
} else {
arrayOfHeaders[headerDirectory + "_" + o] = [obj[o]];
}
}
}
else {
//console.log("Has value and is not root ", o)
//console.log("Current Header Directory " + headerDirectory)
//console.log("Saved temp : ", temp)
if (isNaN(o)) {
if (headerDirectory == "") headerDirectory = temp;
//arrayOfHeaders.push(headerDirectory + "_" + o)
if (arrayOfHeaders[headerDirectory + "_" + o] !== undefined) {
arrayOfHeaders[headerDirectory + "_" + o].push(obj[o]);
} else {
arrayOfHeaders[headerDirectory + "_" + o] = [obj[o]];
}
}
}
}
}
}
var res = JSON.stringify(arrayOfHeaders).replace(/,"/g, ',\n"')
console.log("Easier Arrays in Array printed by JSON.stringify:\n", res)
res = {
"_id": ["5cfe7d3c6deeeef08ce0444b"],
"name": ["Debra Milligain"],
"phone": ["+1 (906) 432-2182"],
"address": ["676 Merit Court, Steinhatchee, Oregon, 5491"],
"tags_0": ["consequat"],
"tags_1": ["reprehenderit"],
"tags_2": ["amet"],
"Work_skills_id": [0, 1],
"Work_skills_name": ["Programming",
"Business"],
"friends_id": [0, 1, 2],
"friends_name": ["Stafford Hernandez",
"Colleen Christensen",
"Barker Keith"],
"favoriteFruit": ["banana"]
};
var yourResult = "";
for(var i in arrayOfHeaders) {
if(arrayOfHeaders[i].length > 1) {
arrayOfHeaders[i] = '"' + arrayOfHeaders[i].join('","') + '"';
} else {
arrayOfHeaders[i] = '"' + arrayOfHeaders[i] + '"';
}
yourResult += i + ':' + arrayOfHeaders[i] + '\n';
}
console.log("\nProbably result you wanted to collect but invalid JSON format:\n", yourResult);但是，如果您将它们与我的答案进行比较，打印的结构是相同的，但与您手动生成的表格不同（可能有一些错误）。
【问题讨论】：
-
将任意数据结构转换为 csv 是不可能的。 csvs 用于表格数据，而 json 不是。
-
有一个网站似乎按照我的想法进行操作，名为json-csv。而我目前的反应感觉就像我很接近得到它。我想我必须以某种方式跟踪行数。但我又不确定
-
该页面正在尽其所能，但它的输出在语义上是错误的。为了产生语义上正确的结果，您必须有多个相互引用的关联表......也就是说。已经有图书馆可以做到这一点。没有理由自己动手。
-
你知道这些是哪些库吗，哈哈，因为我花了一天时间试图弄清楚这些东西。
-
有很多 em 人，只需进行谷歌搜索。在 npm 上有一个名为 json2csv 的文件，看起来很成熟。
标签： javascript json csv