A golang implementation of JsonPath syntax. follow the majority rules in http://goessner.net/articles/JsonPath/ but also with some minor differences.
this library is till bleeding edge, so use it at your own risk. :D
Golang Version Required: 1.5
go get github.com/oliveagle/jsonpathexample code:
import (
"github.com/oliveagle/jsonpath"
"encoding/json"
)
var json_data interface{}
json.Unmarshal([]byte(data), &json_data)
res, err := jsonpath.JsonPathLookup(json_data, "$.expensive")
//or reuse lookup pattern
pat, _ := jsonpath.Compile(`$.store.book[?(@.price < $.expensive)].price`)
res, err := pat.Lookup(json_data)referenced from github.com/jayway/JsonPath
| Operator | Supported | Description |
|---|---|---|
| $ | Y | The root element to query. This starts all path expressions. |
| @ | Y | The current node being processed by a filter predicate. |
| * | X | Wildcard. Available anywhere a name or numeric are required. |
| .. | X | Deep scan. Available anywhere a name is required. |
| . | Y | Dot-notated child |
| ['' (, '')] | X | Bracket-notated child or children |
| [ (, )] | Y | Array index or indexes |
| [start:end] | Y | Array slice operator |
| [?()] | Y | Filter expression. Expression must evaluate to a boolean value. |
given these example 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
}| jsonpath | result |
|---|---|
| $.expensive | 10 |
| $.store.book[0].price | 8.95 |
| $.store.book[-1].isbn | "0-395-19395-8" |
| $.store.book[0,1].price | [8.95, 12.99] |
| $.store.book[0:2].price | [8.95, 12.99, 8.99] |
| $.store.book[?(@.isbn)].price | [8.99, 22.99] |
| $.store.book[?(@.price > 10)].title | ["Sword of Honour", "The Lord of the Rings"] |
|
|
[8.95, 8.99] |
| $.store.book[:].price | [8.9.5, 12.99, 8.9.9, 22.99] |
| $.store.book[?(@.author =~ /(?i).*REES/)].author | "Nigel Rees" |
Note: golang support regular expression flags in form of
(?imsU)pattern