json_path 0.3.1 json_path: ^0.3.1 copied to clipboard
Implementation of JSONPath expressions like "$.store.book[2].price". Reads and writes values in parsed JSON objects.
import 'dart:convert';
import 'package:json_path/json_path.dart';
void main() {
final document = jsonDecode('''
{
"store": {
"book": [
{
"category": "reference",
"author": "Nigel Rees",
"title": "Sayings of the Century",
"price": 8.95
},
{
"category": "fiction",
"author": "Evelyn Waugh",
"title": "Sword of Honour",
"price": 12.99
},
{
"category": "fiction",
"author": "Herman Melville",
"title": "Moby Dick",
"isbn": "0-553-21311-3",
"price": 8.99
},
{
"category": "fiction",
"author": "J. R. R. Tolkien",
"title": "The Lord of the Rings",
"isbn": "0-395-19395-8",
"price": 22.99
}
],
"bicycle": {
"color": "red",
"price": 19.95
}
}
}
''');
final prices = JsonPath(r'$..price');
print('All prices in the store:');
/// The following code will print:
///
/// /store/book/0/price: 8.95
/// /store/book/1/price: 12.99
/// /store/book/2/price: 8.99
/// /store/book/3/price: 22.99
/// /store/bicycle/price: 19.95
prices
.read(document)
.map((match) => '${match.pointer}:\t${match.value}')
.forEach(print);
print('Books under 10:');
JsonPath(r'$.store.book[?(@.price < 10)].title')
.read(document)
.map((match) => '${match.pointer}:\t${match.value}')
.forEach(print);
print("Book with letter 'a' in the author's name:");
JsonPath(r'$.store.book[?author].title', filters: {
'author': (match) {
final author = match.value['author'];
return author is String && author.contains('a');
}
})
.read(document)
.map((match) => '${match.pointer}:\t${match.value}')
.forEach(print);
}