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The JSON datatype supports querying with the JSONPath query language.

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Querying an Element

import static org.camunda.spin.Spin.JSON;

String json = "{\"child\": [{\"id\": 1,\"name\": \"Lucy\",\"sex\": \"female\"},{\"id\": 2,\"name\": \"Tracy\",\"sex\": \"female\"}],\"number\": 1,\"boolean\": true}";

SpinJsonNode child = JSON(json).jsonPath("$.child[0]").element();

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Querying an Element List

import static org.camunda.spin.Spin.JSON;

String json = "{\"child\": [{\"id\": 1,\"name\": \"Lucy\",\"sex\": \"female\"},{\"id\": 2,\"name\": \"Tracy\",\"sex\": \"female\"}],\"number\": 1,\"boolean\": true}";

SpinList<SpinJsonNode> childs = JSON(json).jsonPath("$.child").elementList();

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Querying a String

import static org.camunda.spin.Spin.JSON;

String json = "{\"child\": [{\"id\": 1,\"name\": \"Lucy\",\"sex\": \"female\"},{\"id\": 2,\"name\": \"Tracy\",\"sex\": \"female\"}],\"number\": 1,\"boolean\": true}";

String value = JSON(json).jsonPath("$.child[0].name").stringValue();

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Querying a Number

import static org.camunda.spin.Spin.JSON;

String json = "{\"child\": [{\"id\": 1,\"name\": \"Lucy\",\"sex\": \"female\"},{\"id\": 2,\"name\": \"Tracy\",\"sex\": \"female\"}],\"number\": 1,\"boolean\": true}";

Double count = JSON(json).jsonPath("$.number").numberValue();

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Querying a Boolean

import static org.camunda.spin.Spin.JSON;

String json = "{\"child\": [{\"id\": 1,\"name\": \"Lucy\",\"sex\": \"female\"},{\"id\": 2,\"name\": \"Tracy\",\"sex\": \"female\"}],\"number\": 1,\"boolean\": true}";

Boolean exists = JSON(json).jsonPath("$.boolean").boolValue();

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Filtering a Query

Be aware that a filtering expression - the expression in the () - is not allowed to contain double quotes! 
import static org.camunda.spin.Spin.JSON;

String json = "{\"child\": [{\"id\": 1,\"name\": \"Lucy\",\"sex\": \"female\"},{\"id\": 2,\"name\": \"Tracy\",\"sex\": \"female\"}],\"number\": 1,\"boolean\": true}";

SpinList<SpinJsonNode> girls = JSON(json).jsonPath("$.child[?(@.sex == 'female')]").elementList();