Traverse a deeply nested JSON with a query string
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import 'package:json_traverse/json_traverse.dart';
void main() {
var jsonString = '''
{
"name": "John Smith",
"email": "john@example.org",
"contact": [
"123",
"456"
]
}
''';
var traverser = JSONTraverse(jsonString);
// for a single string
print(traverser.query('name')); // Prints `John Smith`
// for an array, point the index
print(traverser.query('contact.1')); // Prints `456`
}
First instantiate a JSONTraverse object: JSONTraverse traverser = JSONTraverse(jsonString).
Now, use the query method to traverse through the JSON: traverser.query('name').
If you want to traverse through an array, you have to mention the index, e.g.,
traverser.query('contact.1') for index 1 of the contact array. If the index
is not a valid number, the code will throw a FormatException.