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diff --git a/src/lib/json_util.h b/src/lib/json_util.h
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+++ b/src/lib/json_util.h
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+/**
+ * @file        json_util.h
+ * @brief       Utility for json data, it extracts value from json
+
+ * Copyright (c) 2017 Samsung Electronics Co., Ltd.
+ * This software is the confidential and proprietary information
+ * of Samsung Electronics, Inc. ("Confidential Information"). You
+ * shall not disclose such Confidential Information and shall use
+ * it only in accordance with the terms of the license agreement
+ * you entered into with Samsung.
+ */
+
+#ifndef __JSON_UTIL_H__
+#define __JSON_UTIL_H__
+
+#include <json.h>
+
+/**
+ * @fn        char *json_getString(char *data, char *key)
+ * @brief     this function to get string from key in json data
+ * @param     data          [in] json data
+ * @param     key           [in] key for finding value
+ * @return    *char    value of key
+ */
+char *json_getString(char *data, char *key);
+/**
+ * @fn        char *json_getObject(char *data, char *key)
+ * @brief     this function to get object from key in json data
+ * @param     data          [in] json data
+ * @param     key           [in] key for finding value
+ * @return    *char  object of key
+ */
+char *json_getObject(char *data, char *key);
+/**
+ * @fn        int json_getNumber(char *data, char *key)
+ * @brief     this function to get number from key in json data
+ * @param     data          [in] json data
+ * @param     key           [in] key for finding value
+ * @return    int    number of key
+ */
+int json_getNumber(char *data, char *key);
+/**
+ * @fn        char *json_getArray(char *data, char *key)
+ * @brief     this function to get array from key in json data
+ * @param     data          [in] json data
+ * @param     key           [in] key for finding value
+ * @return    *char    array json of key
+ */
+char *json_getArray(char *data, char *key);
+/**
+ * @fn        int json_getArrayLength(char *data)
+ * @brief     this function to get number of array from key in json data
+ * @param     data          [in] json data
+ * @param     key           [in] key for finding value
+ * @return    int     array count of key
+ */
+int json_getArrayLength(char *data);
+/**
+ * @fn        char *json_getStringFromArray(char *data, char *arrayKey, int arrayIndex, char *key)
+ * @brief     this function to get string from array json data
+ * @param     data          [in] json data
+ * @param     arrayKey      [in] array key for value
+ * @param     arrayIndex    [in] index of array
+ * @param     key           [in] key for finding value
+ * @return    *char  string of key
+ */
+char *json_getStringFromArray(char *data, char *arrayKey, int arrayIndex, char *key);
+
+#endif /* __JSON_UTIL_H__ */