public static JsonNode toJsonNode(final String json) {
        try {
            return MAPPER.readTree(json);
        } catch (JsonProcessingException e) {
            LOG.warn("write to json node error: {}", json, e);
            return new ObjectNode(MAPPER.getNodeFactory());
        }
    }
To json node.

@param json the object
@return the converted map
shenyu-common/src/main/java/org/apache/shenyu/common/utils/JsonUtils.java