使用jq将json映射转换为csv [英] Converting json map to csv using jq

问题描述

输入

{"key1": ["value1", "value2"], "key2": ["value3"]}

所需的输出

key1, value1
key1, value2
key2, value3

很难找到jq命令来实现这一目标...我尝试过使用map，as，to_entries过滤器以各种组合但没有运气.

Having a hard time figuring out jq command to achieve this... I have tried map, as, to_entries filters in various combinations but no luck.

推荐答案

我删除了JSON对象周围的多余括号，以使其成为有效JSON.因此，从此开始:

I removed the extra pair of brackets around your JSON object in order to make it a valid JSON. So, starting with this:

{
  "key1": [ "value1", "value2" ],
  "key2": [ "value3" ]
}

我们应用to_entries，这可以为我们提供:

We apply to_entries, which gives us this:

[
  {
    "key": "key1",
    "value": [ "value1", "value2" ]
  },
  {
    "key": "key2",
    "value": [ "value3" ]
  }
]

然后，我们对每个这些条目进行map并扩展(c2)数组(c2)，为其每个元素(map({key, value: .value[]}))创建一个单独的对象.这给了我们:

Then, we map each of those entries and we spread ([]) the .value array, creating a separate object for each of its elements (map({key, value: .value[]})). This gives us:

[
  {
    "key": "key1",
    "value": "value1"
  },
  {
    "key": "key1",
    "value": "value2"
  },
  {
    "key": "key2",
    "value": "value3"
  }
]

在那之后，对于每个对象，我们需要一个带有其值的数组，因为这是@csv过滤器所期望的.只是映射到数组对象，如map([.key, .value])所示，这为我们提供了:

After that, for each of those objects, we want an array with its values, since that's what the @csv filter expects. That's just mapping to an array object, as in map([.key, .value]), which gives us:

[
  [ "key1", "value1" ],
  [ "key1", "value2" ],
  [ "key2", "value3" ]
]

最后，我们扩展([])数组数组(因为@csv需要单独的数组)，然后将@csv用管道传递给它.完整的脚本如下所示:

And, finally, we spread ([]) the array of arrays (since @csv expects individual arrays) and we pipe @csv to it. The full script looks as follows:

jq -r 'to_entries | map({key, value: .value[]}) | map([.key, .value])[] | @csv' test.json

及其输出:

"key1","value1"  
"key1","value2"  
"key2","value3"

这篇关于使用jq将json映射转换为csv的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！