jsonpath是用于解析json文件的强大工具，不同语言都有各自的实现

jsonpath的设计思想和正则表达式相似

• 首先构建一个【jsonpath表达式】，或者说pattern
• 使用该表达式在json object中匹配结果

jsonpath in python

python的jsonpath_rw使用类似正则表达式的方式，构建一个jsonpath_expr，然后用该expr去匹配json object，返回匹配的对象

jsonpath in golang

github.com/oliveagle/jsonpath也是类似的
以下例子来自readme
json data:

{
    "store": {
        "book": [
            {
                "category": "reference",
                "author": "Nigel Rees",
                "title": "Sayings of the Century",
                "price": 8.95
            },
            {
                "category": "fiction",
                "author": "Evelyn Waugh",
                "title": "Sword of Honour",
                "price": 12.99
            },
            {
                "category": "fiction",
                "author": "Herman Melville",
                "title": "Moby Dick",
                "isbn": "0-553-21311-3",
                "price": 8.99
            },
            {
                "category": "fiction",
                "author": "J. R. R. Tolkien",
                "title": "The Lord of the Rings",
                "isbn": "0-395-19395-8",
                "price": 22.99
            }
        ],
        "bicycle": {
            "color": "red",
            "price": 19.95
        }
    },
    "expensive": 10
}

code

import (
    "github.com/oliveagle/jsonpath"
    "encoding/json"
)

var json_data interface{}
json.Unmarshal([]byte(data), &json_data)

// "$.expensive" is a jsonpath_expr
res, err := jsonpath.JsonPathLookup(json_data, "$.expensive")

//---or reuse lookup pattern---
// Compile returns a jsonpath_expr, which is looked up in target json object
pat, _ := jsonpath.Compile(`$.store.book[?(@.price < $.expensive)].price`)
res, err := pat.Lookup(json_data)