如何使用 jq 将哈希数组 JSON 输入的哈希值转换为 CSV？答案

【问题标题】：How to convert a hash of an array of array of hashes JSON input into CSV using jq?如何使用 jq 将哈希数组 JSON 输入的哈希值转换为 CSV？
【发布时间】：2021-11-19 08:00:12
【问题描述】：

我想将以下 JSON 内容存储在文件 input.json 中

{
    "results": [
        [
           {
               "field": "field1",
               "value": "value1-1"
           },
           {
               "field": "field2",
               "value": "value1-2"
           },
           {
               "field": "field3",
               "value": "value1-3"
           }
        ],
        [
           {
               "field": "field1",
               "value": "value2-1"
           },
           {
               "field": "field2",
               "value": "value2-2"
           },
           {
               "field": "field3",
               "value": "value2-3"
           }
        ],
        [
           {
               "field": "field1",
               "value": "value3-1"
           },
           {
               "field": "field2",
               "value": "value3-2"
           },
           {
               "field": "field3",
               "value": "value3-3"
           }
        ]
    ]
}

转换成 CSV 输出

"field1","field2","field3"
"value1-1","value1-2","value1-3"
"value2-1","value2-2","value2-3"
"value3-1","value3-2","value3-3"

我想出的最接近的 jq 表达式是这样的：

$ cat input.json | jq -r '.results | .[] | map(.field), map(.value) | @csv'
"field1","field2","field3"
"value1-1","value1-2","value1-3"
"field1","field2","field3"
"value2-1","value2-2","value2-3"
"field1","field2","field3"
"value3-1","value3-2","value3-3"

这仍然不正确。我应该如何编写 jq 表达式以获得所需的 CSV 输出？

【问题讨论】：

标签： json bash jq export-to-csv

【解决方案1】：

您正在将.[] 输入map(.field) 以及map(.value)。

仅在first 项上使用map(.field)，在所有.[] 项上使用map(.value)：

jq -r '.results | (first | map(.field)), (.[] | map(.value)) | @csv' input.json

Demo

【讨论】：