ทดสอบ JSONPath

import { JSONPath } from 'jsonpath-plus';

const data = {
  store: {
    book: [
      { title: 'Moby Dick', price: 8.99 },
      { title: 'The Great Gatsby', price: 12.99 }
    ]
  }
};

// Get all book titles
JSONPath({ path: '$.store.book[*].title', json: data });
// → ['Moby Dick', 'The Great Gatsby']

// Recursive descent — find every price in the document
JSONPath({ path: '$..price', json: data });
// → [8.99, 12.99]

// Filter — books under $10
JSONPath({ path: '$.store.book[?(@.price < 10)]', json: data });
// → [{ title: 'Moby Dick', price: 8.99 }]

from jsonpath_ng.ext import parse
import json

data = {
    "store": {
        "book": [
            {"title": "Moby Dick", "price": 8.99},
            {"title": "The Great Gatsby", "price": 12.99}
        ]
    }
}

# Get all book titles
expr = parse("$.store.book[*].title")
titles = [match.value for match in expr.find(data)]
# → ['Moby Dick', 'The Great Gatsby']

# Recursive descent — all prices
expr = parse("$..price")
prices = [match.value for match in expr.find(data)]
# → [8.99, 12.99]

# Filter — books under $10
expr = parse("$.store.book[?price < 10]")
cheap = [match.value for match in expr.find(data)]
# → [{"title": "Moby Dick", "price": 8.99}]

package main

import (
    "fmt"
    "github.com/ohler55/ojg/jp"
    "github.com/ohler55/ojg/oj"
)

func main() {
    src := `{
        "store": {
            "book": [
                {"title": "Moby Dick", "price": 8.99},
                {"title": "The Great Gatsby", "price": 12.99}
            ]
        }
    }`

    obj, _ := oj.ParseString(src)

    // Get all book titles
    expr, _ := jp.ParseString("$.store.book[*].title")
    results := expr.Get(obj)
    fmt.Println(results)
    // → [Moby Dick The Great Gatsby]

    // Recursive descent — all prices
    expr2, _ := jp.ParseString("$..price")
    fmt.Println(expr2.Get(obj))
    // → [8.99 12.99]
}

# jq uses its own syntax, not JSONPath, but solves the same problem.
# Mapping common JSONPath patterns to jq:

# $.store.book[*].title → get all titles
echo '{"store":{"book":[{"title":"Moby Dick"},{"title":"Gatsby"}]}}' | \
  jq '.store.book[].title'
# → "Moby Dick"
# → "Gatsby"

# $..price → recursive descent for "price" keys
echo '{"a":{"price":1},"b":{"price":2}}' | \
  jq '.. | .price? // empty'
# → 1
# → 2

# Filter: books where price < 10
echo '{"store":{"book":[{"title":"A","price":8},{"title":"B","price":12}]}}' | \
  jq '.store.book[] | select(.price < 10)'
# → {"title":"A","price":8}