diff --git a/crates/api-grub/src/json.rs b/crates/api-grub/src/json.rs
new file mode 100644
index 0000000..f0f64d6
--- /dev/null
+++ b/crates/api-grub/src/json.rs
@@ -0,0 +1,176 @@
+// use serde::{de::value, Serialize};
+use serde_json::{json, Value};
+use integr_structs::api::v3::{TestMetric, TestMetricOutput};
+
+pub struct JsonParser;
+
+impl JsonParser {
+    pub fn parse(targets: &Vec<TestMetric>, json: &str) -> Value {
+        let mut res_vec: Vec<TestMetricOutput> = Vec::new(); 
+        for target in targets {
+            let metric = match target.addr.contains("[") {
+                true => JsonParser::get_sum_of_metrics_in_array(target, json),
+                false => JsonParser::get_metric(target, json),
+            };
+            res_vec.push(TestMetricOutput::new_with_slices(&target.id, &target.json_type, metric));
+        }  
+        serde_json::to_value(res_vec).unwrap_or(Value::Null)
+    }
+    fn get_sum_of_metrics_in_array(target: &TestMetric, json: &str) -> Value {
+        if target.addr.is_empty() {
+            return Value::Null;
+        }
+
+        let mut vec_value: Vec<Value> = Vec::new();
+        let mut array_key = String::new();
+        let mut value_json: Value = serde_json::from_str(json).unwrap_or(Value::Null);
+
+        let target_attr_vec = target.addr
+            .split_terminator('.')
+            .collect::<Vec<&str>>();
+        // for keys in [] brackets
+        let mut key_tag = String::new();
+
+        for (global_idx, &key) in target_attr_vec.iter().enumerate() {
+            // if array 
+            let key_checked = if key.contains('[') {
+                let key_idx = key.find("[").unwrap();
+                key_tag = key.chars()
+                    .enumerate()
+                    .filter(|(idx, chr)| *idx > key_idx && *chr != ']')
+                    .map(|(_, chr)| chr)
+                    .collect::<String>();
+                dbg!(&key_tag);
+                key.chars()
+                    .enumerate()
+                    .filter(|(idx, _)| *idx < key_idx)
+                    .map(|(_, chr)| chr)
+                    .collect::<String>()
+                // dbg!(value_json.get(&array_key).unwrap_or(&Value::Null));
+                // value_json = value_json.get(array_key).unwrap_or(&Value::Null).clone();
+                // continue;
+                // new_key.as_str()
+                // dbg!(key);       APPROVED 
+            // TODO: need to check key in [] type of [KEY]
+            } else {key.to_owned()};
+            
+            // if already array 
+            match value_json.get(key_checked) {
+                Some(val) => {
+                    match val {
+                        Value::Array(array) => {
+                            // form new target array
+                            let new_array_target = target_attr_vec
+                                .iter()
+                                .enumerate()
+                                .filter(|(idx, _)| *idx > global_idx)
+                                .map(|(_, &chr)| chr.to_owned())
+                                .collect::<Vec<String>>();
+                            // get_values_in_array
+                            // get_tags_in_array
+                            // // slice_tags_with_values
+                            // dbg!(&array);
+                            // dbg!(&new_array_target);
+                            let res_arr = Self::get_values_in_array(array, &new_array_target);
+                            if &key_tag == "" {
+                                return res_arr.into();
+                            }
+                            return Self::slice_with_tags_in_array(array, &res_arr, &key_tag).into()
+                            
+                        },
+                        _ => value_json = val.clone(),
+                    }
+                },
+                None => return Value::Null,
+            }
+        }
+        value_json
+    }
+
+    fn slice_with_tags_in_array(array: &Vec<Value>, metrics: &Vec<Value>, tag_name: &str) -> Vec<Value> {
+        if tag_name.is_empty() {
+            return metrics.clone();
+        }
+        // array[0].as_object().unwrap_or(json!(Value::Null))
+        let mut values: Vec<Value> = Vec::new();
+        array.iter()
+            .enumerate()
+            .map(|(idx, val)| {
+                let val = val.get(tag_name).unwrap_or(&Value::Null).clone();
+                (serde_json::from_value::<serde_json::Map<String, Value>>(json!({tag_name: val})), 
+                serde_json::from_value::<serde_json::Map<String, Value>>(metrics[idx].clone()))
+            })
+            .for_each(|(key, val)| {
+                // dbg!(&key);
+                if key.is_ok() && val.is_ok() {
+                    let mut key = key.unwrap();
+                    let mut val = val.unwrap();
+                    key.append(&mut val);
+                    values.push(json!(key));
+                }
+            });
+        if values.len() == 0 {
+            return metrics.clone();
+        }
+        values
+    }
+    fn get_values_in_array(array: &Vec<Value>, fields: &Vec<String>) -> Vec<Value> {
+        let mut values: Vec<Value> = Vec::new();
+        for obj in array {
+            // dbg!(obj);
+            let mut obrez = obj.clone();
+            for field in fields {
+                obrez = obrez.get(field).unwrap_or(&Value::Null).clone();
+                match obrez {
+                    Value::Object(_) => {continue},
+                    _ => {
+                        values.push(json!({field: obrez.clone()}));
+                    },
+                    // None => {values.push(Value::Null)},
+                }
+            }
+        }
+        values
+    }
+
+    fn get_metric(target: &TestMetric, json: &str) -> Value {
+        if target.addr.is_empty() {
+            return Value::Null;
+        }
+        let mut value_json: Value = serde_json::from_str(json).unwrap_or(Value::Null);
+
+        let target_attr_vec = target.addr
+            .split_terminator('.')
+            .collect::<Vec<&str>>();
+        for key in target_attr_vec {
+            match value_json.get(key) {
+                Some(val) => value_json = val.clone(),
+                None => return Value::Null,
+            }
+        }
+        value_json    
+    }
+}
+
+
+// pub struct TestMetric {
+//     pub id : String,
+//     pub json_type : String,
+//     pub addr : String,
+// }
+
+// #[derive(Serialize)]
+// struct TestMetricOutput {
+//     id : String,
+//     json_type : String,
+//     value : Value,
+// }
+// impl TestMetricOutput {
+//     fn new_with_slices(id : &str, json_type : &str, value : Value) -> Self {
+//         TestMetricOutput {
+//             id : id.to_string(),
+//             json_type : json_type.to_string(),
+//             value : value,
+//         }
+//     } 
+// }
\ No newline at end of file
diff --git a/crates/api-grub/src/main.rs b/crates/api-grub/src/main.rs
index 2fe4a95..5997ae8 100644
--- a/crates/api-grub/src/main.rs
+++ b/crates/api-grub/src/main.rs
@@ -1,6 +1,7 @@
 mod config;
 mod net;
 mod logger;
+mod json;
 
 use anyhow::Result;
 use integr_structs::api::ApiConfigV2;
diff --git a/crates/integr-structs/src/api.rs b/crates/integr-structs/src/api.rs
index c062da7..7712b28 100644
--- a/crates/integr-structs/src/api.rs
+++ b/crates/integr-structs/src/api.rs
@@ -144,4 +144,29 @@ impl ProcessedEndpoint {
         let val = ProcessedEndpoint::new(&keys.id, &keys.name, &keys.url, &keys.method,hm);
         Ok(to_string_pretty(&val)?)
     }
+}
+
+pub mod v3 {
+    pub use super::*;
+    pub struct TestMetric {
+        pub id : String,
+        pub json_type : String,
+        pub addr : String,
+    }
+    
+    #[derive(Serialize)]
+    pub struct TestMetricOutput {
+        id : String,
+        json_type : String,
+        value : Value,
+    }
+    impl TestMetricOutput {
+        pub fn new_with_slices(id : &str, json_type : &str, value : Value) -> Self {
+            TestMetricOutput {
+                id : id.to_string(),
+                json_type : json_type.to_string(),
+                value : value,
+            }
+        } 
+    }
 }
\ No newline at end of file