github.com/tidwall/gjson包

$ go get github.com/tidwall/gjson

操作

package main

const json = `
{
  "name":{"first":"gaga", "小明": "frauk"},
  "age": 18,
  "children": ["xiaohua", "jiajia", "Jayjay],
  "fav.movie": "Dear haha",
  "friends": [
    {"first": "Dale", "last":"Murphy", "age": 44, "nets": ["ig", "fb", "tw"]},
    {"first": "Roger", "last": "Craig", "age": 68, "nets": ["fb", "tw"]},
    {"first": "Jane", "last": "Murphy", "age": 47, "nets": ["ig", "tw"]}
  ]
}
`

func main() {
  fmt.Println("last name:", gjson.Get(json, "name.last"))
  fmt.Println("age:", gjson.Get(json, "age"))
  fmt.Println("children:", gjson.Get(json, "children"))
  fmt.Println("children count:", gjson.Get(json, "children.#"))
  fmt.Println("second child:", gjson.Get(json, "children.1"))
  fmt.Println("third child*:", gjson.Get(json, "child*.2"))
  fmt.Println("first c?ild:", gjson.Get(json, "c?ildren.0"))
  fmt.Println("fav.moive", gjson.Get(json, `fav.\moive`))
  fmt.Println("first name of friends:", gjson.Get(json, "friends.#.first"))
  fmt.Println("last name of second friend:", gjson.Get(json, "friends.1.last"))
}

结果：

last name: Anderson
age: 37
children: ["Sara", "Alex", "Jack"]
children count: 3
second child: Alex
third child*: Jack
first c?ild: Sara
fave.moive 
first name of friends: ["Dale","Roger","Jane"]
last name of second friend: Craig