JSON path syntax introduction and usage scenarios

One 、 What is? JSON Path

JSONPath To JSON, as XPath To XML.JSONPath It's convenient for JSON Data structure for content extraction .

Here's a JSON Path Examples of grammar ：

$.store.book[0].title

Two 、 Grammar introduction

This is a very classic case , You can introduce in almost any JSON Path Where you see it , But it's practical .

{
     "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
    }
  }
}

Example of cooperation , Corresponding to the syntax of the above table , The following examples are better understood .

This address can be run online http://jsonpath.com/

3、 ... and 、 Where can I use it ？

It doesn't make much sense to have grammar alone , So where can I use JSON Path Well ？

1. Java

Jayway JsonPath , For reading JSON Document Java DSL.

Project address ： https://github.com/json-path/JsonPath

2. PHP

JsonPath,JsonPath Of PHP Realization .

Project address ： https://github.com/Galbar/JsonPath-PHP

3. JavaScript

jsonpath, Use JSONPath Expression query JavaScript object . be used for Node.js A powerful / Safe JSONPath engine .

Project address ： https://github.com/dchester/jsonpath

4. Python

jsonpath-ng, Designed to meet the standard Python JSONPath The ultimate realization of , Including arithmetic and binary comparison operators , And provide clear AST.

Project address ：https://pypi.org/project/jsonpath-ng/

5. Go

Jsonpath,JsonPath Of PHP Realization .

Project address ：https://github.com/yalp/jsonpath

Four 、 summary

JSON Path As a grammatical standard , Realized with JSON Convenient reading . in addition , All kinds of languages JSON Path The names of the implemented projects are similar .