使用jq解析JSON字符串 [英] Use jq to parse a JSON String

问题描述

我正在尝试获取jq来解析JSON结构，例如:

{
  "a" : 1,
  "b" : 2,
  "c" : "{\"id\":\"9ee ...\",\"parent\":\"abc...\"}\n"
}

也就是说，JSON中的元素是带有转义json的字符串.

所以，我有一些类似的东西 $ jq [.c] myFile.json | jq [.id]

但是这会随着jq: error: Cannot index string with string

崩溃

这是因为.c的输出是一个字符串，而不是JSON. 如何让jq解析此字符串?

我最初的解决方案是使用sed替换所有转义字符(\":\"，\",\"和\")，但这很麻烦，我认为jq中内置了一种方法来做到这一点? >

谢谢！

另外，这里可用的jq版本是:

$ jq --version
jq version 1.3

我想我可以根据需要对其进行更新.

解决方案

jq具有 fromjson 内置于此:

jq '.c | fromjson | .id' myFile.json

fromjson是在1.4版中添加的.

I'm trying to get jq to parse a JSON structure like:

{
  "a" : 1,
  "b" : 2,
  "c" : "{\"id\":\"9ee ...\",\"parent\":\"abc...\"}\n"
}

That is, an element in the JSON is a string with escaped json.

So, I have something along the lines of $ jq [.c] myFile.json | jq [.id]

But that crashes with jq: error: Cannot index string with string

This is because the output of .c is a string, not more JSON. How do I get jq to parse this string?

My initial solution is to use sed to replace all the escape chars (\":\", \",\" and \") but that's messy, I assume there's a way built into jq to do this?

Thanks!

edit: Also, the jq version available here is:

$ jq --version
jq version 1.3

I guess I could update it if required.

解决方案

jq has the fromjson builtin for this:

jq '.c | fromjson | .id' myFile.json

fromjson was added in version 1.4.

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