diff --git a/README.md b/README.md
index 71e19b1..354369a 100644
--- a/README.md
+++ b/README.md
@@ -50,7 +50,7 @@ extern crate serde_json;
 #### Rust - jsonpath::Selector struct
 
 ```rust
-#[derive(Serialize, Deserialize, PartialEq, Debug)]
+#[derive(Deserialize, PartialEq, Debug)]
 struct Friend {
     name: String,
     age: Option<u8>,
@@ -72,43 +72,16 @@ let mut selector = Selector::new();
 
 let result = selector
     .path("$..[?(@.age >= 30)]").unwrap()
-//    .value_from_str(&serde_json::to_string(&json_obj).unwrap() /*&str*/).unwrap()
-//    .value_from(&json_obj /*&impl serde::ser::Serialize*/).unwrap()
-    .value(&json_obj /*serde_json::value::Value*/).unwrap()
-    .select_as_value().unwrap();
+    .value(&json_obj)
+    .select().unwrap();
 
-assert_eq!(json!([{"name": "친구3", "age": 30}]), result);
+assert_eq!(vec![&json!({"name": "친구3", "age": 30})], result);
 
 let result = selector.select_as_str().unwrap();
 assert_eq!(r#"[{"name":"친구3","age":30}]"#, result);
 
-let result = selector.select_as::<Vec<Friend>>().unwrap();
+let result = selector.select_as::<Friend>().unwrap();
 assert_eq!(vec![Friend { name: "친구3".to_string(), age: Some(30) }], result);
-
-let _ = selector.map(|v| {
-    let r = match v {
-        Value::Array(mut vec) => {
-            for mut v in &mut vec {
-                v.as_object_mut().unwrap().remove("age");
-            }
-            Value::Array(vec)
-        }
-        _ => Value::Null
-    };
-    Some(r)
-});
-assert_eq!(json!([{ "name": "친구3" }]), selector.get().unwrap());
-
-let _ = selector.value(&json_obj).unwrap()
-    .map_as(|mut v: Vec<Friend>| {
-        let mut f = v.pop().unwrap();
-        f.name = "friend3".to_string();
-        f.age = None;
-        Some(vec![f])
-    });
-
-assert_eq!(vec![Friend { name: "friend3".to_string(), age: None }],
-           selector.get_as::<Vec<Friend>>().unwrap());
 ```
 
 #### Rust - jsonpath::select(json: &serde_json::value::Value, jsonpath: &str)
@@ -128,11 +101,10 @@ let json_obj = json!({
 
 let json = jsonpath::select(&json_obj, "$..friends[0]").unwrap();
 
-let ret = json!([
-    {"name": "친구3", "age": 30},
-    {"name": "친구1", "age": 20}
+assert_eq!(json, vec![
+    &json!({"name": "친구3", "age": 30}),
+    &json!({"name": "친구1", "age": 20})
 ]);
-assert_eq!(json, ret);
 ```
 
 #### Rust - jsonpath::select_as_str(json: &str, jsonpath: &str)
@@ -166,7 +138,7 @@ struct Person {
     phones: Vec<String>,
 }
 
-let ret: Person = jsonpath::select_as(r#"
+let ret: Vec<Person> = jsonpath::select_as(r#"
 {
     "person":
         {
@@ -186,7 +158,7 @@ let person = Person {
     phones: vec!["+44 1234567".to_string(), "+44 2345678".to_string()],
 };
 
-assert_eq!(person, ret);
+assert_eq!(ret[0], person);
 ```
 
 #### Rust - jsonpath::compile(jsonpath: &str)
@@ -208,12 +180,10 @@ let json_obj = json!({
 
 let json = template(&json_obj).unwrap();
 
-let ret = json!([
-    {"name": "친구3", "age": 30},
-    {"name": "친구1", "age": 20}
+assert_eq!(json, vec![
+    &json!({"name": "친구3", "age": 30}),
+    &json!({"name": "친구1", "age": 20})
 ]);
-
-assert_eq!(json, ret);
 ```
 
 #### Rust - jsonpath::selector(json: &serde_json::value::Value)
@@ -235,21 +205,17 @@ let mut selector = jsonpath::selector(&json_obj);
 
 let json = selector("$..friends[0]").unwrap();
 
-let ret = json!([
-    {"name": "친구3", "age": 30},
-    {"name": "친구1", "age": 20}
+assert_eq!(json, vec![
+    &json!({"name": "친구3", "age": 30}),
+    &json!({"name": "친구1", "age": 20})
 ]);
 
-assert_eq!(json, ret);
-
 let json = selector("$..friends[1]").unwrap();
 
-let ret = json!([
-    {"name": "친구4"},
-    {"name": "친구2", "age": 20}
+assert_eq!(json, vec![
+    &json!({"name": "친구4"}),
+    &json!({"name": "친구2", "age": 20})
 ]);
-
-assert_eq!(json, ret);
 ```
 
 #### Rust - jsonpath::selector_as\<T: `serde::de::DeserializeOwned`\>(json: &serde_json::value::Value)
@@ -267,13 +233,13 @@ let json_obj = json!({
         {"name": "친구4"}
 ]});
 
-#[derive(Serialize, Deserialize, PartialEq, Debug)]
+#[derive(Deserialize, PartialEq, Debug)]
 struct Friend {
     name: String,
     age: Option<u8>,
 }
 
-let mut selector = jsonpath::selector_as::<Vec<Friend>>(&json_obj);
+let mut selector = jsonpath::selector_as::<Friend>(&json_obj);
 
 let json = selector("$..friends[0]").unwrap();
 
@@ -346,21 +312,10 @@ let selector = new jsonpath.Selector();
 selector.path('$..friends[0]');
 selector.value(jsonObj);
 
-let selectAsObj = selector.selectAs();
-let selectAsString = selector.selectAsStr();
+let retObj = selector.select();
 
-console.log(
-    JSON.stringify(ret) == JSON.stringify(selectAsObj),
-    JSON.stringify(ret) == selectAsString
-);
+console.log(JSON.stringify(ret) == JSON.stringify(retObj));
 
-selector.map(function(v) {
-    let f1 = v[0];
-    f1.name = 'friend3';
-    return [f1];
-});
-
-console.log(JSON.stringify(selector.get()) === JSON.stringify([{"name": "friend3", "age": 30}]));
 // => true
 ```
 
@@ -389,15 +344,11 @@ let selector = new jsonpath.Selector()
     .path('$..friends[0]')
     .value(jsonObj);
 
-let selectAsObj = selector.selectAs();
-let selectAsString = selector.selectAsStr();
+let retObj = selector.select();
 
-console.log(
-    JSON.stringify(ret) == JSON.stringify(selectAsObj),
-    JSON.stringify(ret) == selectAsString
-);
+console.log(JSON.stringify(ret) == JSON.stringify(retObj));
 
-// => true, true
+// => true
 ```
 
 #### Javascript - jsonpath.select(json: string|object, jsonpath: string)
diff --git a/nodejs/lib/index.js b/nodejs/lib/index.js
index 20032c7..68e0122 100644
--- a/nodejs/lib/index.js
+++ b/nodejs/lib/index.js
@@ -42,39 +42,12 @@ class Selector {
         if(typeof json != 'string') {
             json = JSON.stringify(json)
         }
-        this._selector.valueFromStr(json);
+        this._selector.value(json);
         return this;
     }
 
-    selectToStr() {
-        return this.selectAsStr();
-    }
-
-    selectTo() {
-        return this.selectAs();
-    }
-
-    selectAsStr() {
-        return this._selector.selectAsStr();
-    }
-
-    selectAs() {
-        return JSON.parse(this.selectAsStr());
-    }
-
-    map(func) {
-        this._selector.map((json) => {
-            var result = func.call(null, JSON.parse(json));
-            if(typeof result !== 'string') {
-                result = JSON.stringify(result);
-            }
-            return result;
-        });
-        return this;
-    }
-
-    get() {
-        return JSON.parse(this._selector.get());
+    select() {
+        return JSON.parse(this._selector.select());
     }
 }
 
diff --git a/nodejs/native/Cargo.toml b/nodejs/native/Cargo.toml
index 2e6238a..9b0f1ce 100644
--- a/nodejs/native/Cargo.toml
+++ b/nodejs/native/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "jsonpath4nodejs"
-version = "0.1.3"
+version = "0.2.0"
 authors = ["Changseok Han <freestrings@gmail.com>"]
 description = "jsonpath_lib bindings for nodejs"
 keywords = ["library", "jsonpath", "json", "nodejs"]
@@ -14,7 +14,7 @@ exclude = ["artifacts.json", "index.node"]
 neon-build = "0.2.0"
 
 [dependencies]
-jsonpath_lib = "0.1.13"
+jsonpath_lib = "0.2.0"
 neon = "0.2.0"
 neon-serde = "0.1.1"
 serde_json = { version = "1.0", features = ["preserve_order"] }
diff --git a/nodejs/native/src/lib.rs b/nodejs/native/src/lib.rs
index 09f5c72..6056220 100644
--- a/nodejs/native/src/lib.rs
+++ b/nodejs/native/src/lib.rs
@@ -4,13 +4,9 @@ extern crate neon;
 extern crate neon_serde;
 extern crate serde_json;
 
-use jsonpath::filter::value_filter::JsonValueFilter;
-use jsonpath::parser::parser::{Node, NodeVisitor, Parser};
-use jsonpath::ref_value::model::{RefValue, RefValueWrapper};
-use jsonpath::Selector;
+use jsonpath::{JsonPathError, Node, Parser, Selector};
 use neon::prelude::*;
 use serde_json::Value;
-use std::ops::Deref;
 
 ///
 /// `neon_serde::from_value` has very poor performance.
@@ -35,96 +31,124 @@ fn select_str(mut ctx: FunctionContext) -> JsResult<JsValue> {
     }
 }
 
-pub struct CompileFn {
-    node: Node
-}
-
-pub struct SelectorFn {
-    json: RefValueWrapper
-}
 
 pub struct SelectorCls {
-    selector: Selector
+    node: Option<Node>,
+    value: Option<Value>,
+}
+
+impl SelectorCls {
+    fn path(&mut self, path: &str) {
+        let mut parser = Parser::new(path);
+        let node = match parser.compile() {
+            Ok(node) => node,
+            Err(e) => panic!("{:?}", e)
+        };
+
+        self.node = Some(node);
+    }
+
+    fn value(&mut self, json_str: &str) {
+        let value: Value = match serde_json::from_str(&json_str) {
+            Ok(value) => value,
+            Err(e) => panic!("{:?}", JsonPathError::Serde(e.to_string()))
+        };
+
+        self.value = Some(value);
+    }
+
+    fn select(&self) -> String {
+        let node = match &self.node {
+            Some(node) => node.clone(),
+            None => panic!("{:?}", JsonPathError::EmptyPath)
+        };
+
+        let value = match &self.value {
+            Some(value) => value,
+            None => panic!("{:?}", JsonPathError::EmptyValue)
+        };
+
+        let mut selector = Selector::new();
+        selector.compiled_path(node.clone());
+        selector.value(&value);
+        match selector.select_as_str() {
+            Ok(ret) => ret,
+            Err(e) => panic!("{:?}", e)
+        }
+    }
 }
 
 declare_types! {
-    pub class JsCompileFn for CompileFn {
+    pub class JsCompileFn for SelectorCls {
         init(mut ctx) {
             let path = ctx.argument::<JsString>(0)?.value();
             let mut parser = Parser::new(path.as_str());
-
             let node = match parser.compile() {
                 Ok(node) => node,
                 Err(e) => panic!("{:?}", e)
             };
 
-            Ok(CompileFn { node })
+            Ok(SelectorCls { node: Some(node), value: None })
         }
 
         method template(mut ctx) {
-            let this = ctx.this();
-
-            let node = {
-                let guard = ctx.lock();
-                let this = this.borrow(&guard);
-                this.node.clone()
-            };
+            let mut this = ctx.this();
 
             let json_str = ctx.argument::<JsString>(0)?.value();
-            let ref_value: RefValue = match serde_json::from_str(&json_str) {
-                Ok(ref_value) => ref_value,
-                Err(e) => panic!("{:?}", e)
+            {
+                let guard = ctx.lock();
+                let mut this = this.borrow_mut(&guard);
+                let value: Value = match serde_json::from_str(&json_str) {
+                    Ok(value) => value,
+                    Err(e) => panic!("{:?}", JsonPathError::Serde(e.to_string()))
+                };
+                this.value = Some(value);
             };
 
-            let mut jf = JsonValueFilter::new_from_value(ref_value.into());
-            jf.visit(node);
-            match serde_json::to_string(&jf.take_value().deref()) {
-                Ok(json_str) => Ok(JsString::new(&mut ctx, &json_str).upcast()),
-                Err(e) => panic!("{:?}", e)
-            }
+            let result_str = {
+                let guard = ctx.lock();
+                let this = this.borrow(&guard);
+                this.select()
+            };
+
+            Ok(JsString::new(&mut ctx, &result_str).upcast())
         }
     }
 
-    pub class JsSelectorFn for SelectorFn {
+    pub class JsSelectorFn for SelectorCls {
         init(mut ctx) {
             let json_str = ctx.argument::<JsString>(0)?.value();
-            let ref_value: RefValue = match serde_json::from_str(&json_str) {
-                Ok(ref_value) => ref_value,
-                Err(e) => panic!("{:?}", e)
+            let value: Value = match serde_json::from_str(&json_str) {
+                Ok(value) => value,
+                Err(e) => panic!("{:?}", JsonPathError::Serde(e.to_string()))
             };
 
-            Ok(SelectorFn { json: ref_value.into() })
+            Ok(SelectorCls { node: None, value: Some(value) })
         }
 
         method select(mut ctx) {
-            let this = ctx.this();
-
-            let json = {
-                let guard = ctx.lock();
-                let this = this.borrow(&guard);
-                this.json.clone()
-            };
+            let mut this = ctx.this();
 
             let path = ctx.argument::<JsString>(0)?.value();
-            let mut parser = Parser::new(path.as_str());
+            {
+                let guard = ctx.lock();
+                let mut this = this.borrow_mut(&guard);
+                this.path(&path);
+            }
 
-            let node = match parser.compile() {
-                Ok(node) => node,
-                Err(e) => panic!("{:?}", e)
+            let result_str = {
+                let guard = ctx.lock();
+                let this = this.borrow(&guard);
+                this.select()
             };
 
-            let mut jf = JsonValueFilter::new_from_value(json);
-            jf.visit(node);
-            match serde_json::to_string(&jf.take_value().deref()) {
-                Ok(json_str) => Ok(JsString::new(&mut ctx, &json_str).upcast()),
-                Err(e) => panic!("{:?}", e)
-            }
+            Ok(JsString::new(&mut ctx, &result_str).upcast())
         }
     }
 
     pub class JsSelector for SelectorCls {
         init(mut _ctx) {
-            Ok(SelectorCls { selector: Selector::new() })
+            Ok(SelectorCls { node: None, value: None })
         }
 
         method path(mut ctx) {
@@ -134,80 +158,35 @@ declare_types! {
             {
                 let guard = ctx.lock();
                 let mut this = this.borrow_mut(&guard);
-                let _ = this.selector.path(&path);
+                let _ = this.path(&path);
             }
+
             Ok(JsUndefined::new().upcast())
         }
 
-        method valueFromStr(mut ctx) {
+        method value(mut ctx) {
             let mut this = ctx.this();
 
             let json_str = ctx.argument::<JsString>(0)?.value();
             {
                 let guard = ctx.lock();
                 let mut this = this.borrow_mut(&guard);
-                let _ = this.selector.value_from_str(&json_str);
+                let _ = this.value(&json_str);
             }
+
             Ok(JsUndefined::new().upcast())
         }
 
-        method selectAsStr(mut ctx) {
-             let mut this = ctx.this();
+        method select(mut ctx) {
+             let this = ctx.this();
 
-             let result = {
+             let result_str = {
                 let guard = ctx.lock();
-                let this = this.borrow_mut(&guard);
-                this.selector.select_as_str()
+                let this = this.borrow(&guard);
+                this.select()
              };
 
-             match result {
-                Ok(json_str) => Ok(JsString::new(&mut ctx, &json_str).upcast()),
-                Err(e) => panic!("{:?}", e)
-             }
-        }
-
-        method map(mut ctx) {
-            let null = ctx.null();
-            let mut this = ctx.this();
-
-            let func = ctx.argument::<JsFunction>(0)?;
-
-            let value = {
-                let guard = ctx.lock();
-                let this = this.borrow_mut(&guard);
-                match this.selector.select_as_str() {
-                    Ok(v) => v,
-                    Err(e) => panic!("{:?}", e)
-                }
-            };
-
-            let js_value = JsString::new(&mut ctx, &value);
-            let json_str = func.call(&mut ctx, null, vec![js_value])?
-                .downcast::<JsString>()
-                .or_throw(&mut ctx)?
-                .value();
-            {
-                let guard = ctx.lock();
-                let mut this = this.borrow_mut(&guard);
-                let _ = this.selector.value_from_str(&json_str);
-            }
-
-            Ok(JsUndefined::new().upcast())
-        }
-
-        method get(mut ctx) {
-            let mut this = ctx.this();
-
-            let result = {
-                let guard = ctx.lock();
-                let this = this.borrow_mut(&guard);
-                match this.selector.get() {
-                    Ok(v) => v,
-                    Err(e) => panic!("{:?}", e)
-                }
-            };
-
-            Ok(JsString::new(&mut ctx, &result.to_string()).upcast())
+             Ok(JsString::new(&mut ctx, &result_str).upcast())
         }
     }
 }
diff --git a/nodejs/test/index.spec.js b/nodejs/test/index.spec.js
index 99ee6e8..e4d50ba 100644
--- a/nodejs/test/index.spec.js
+++ b/nodejs/test/index.spec.js
@@ -359,7 +359,7 @@ describe('compile test', () => {
     it('basic', (done) => {
         let template = jsonpath.compile('$.a');
         let result = template({'a': 1});
-        if (result === 1) {
+        if (result[0] === 1) {
             done();
         }
     });
@@ -369,7 +369,7 @@ describe('selector test', () => {
     it('basic', (done) => {
         let selector = jsonpath.selector({'a': 1});
         let result = selector('$.a');
-        if (result === 1) {
+        if (result[0] === 1) {
             done();
         }
     });
@@ -378,7 +378,7 @@ describe('selector test', () => {
 describe('select test', () => {
     it('basic', (done) => {
         let result = jsonpath.select({'a': 1}, '$.a');
-        if (result === 1) {
+        if (result[0] === 1) {
             done();
         }
     });
@@ -401,24 +401,10 @@ describe('filter test', () => {
 });
 
 describe('Selector test', () => {
-    it('basic selectTo', (done) => {
-        let result = new jsonpath.Selector().path('$.a').value({'a': 1}).selectTo();
-        if (result === 1) {
-            done();
-        }
-    });
-
-    it('basic selectToStr', (done) => {
-        let result = new jsonpath.Selector().path('$.a').value({'a': 1}).selectToStr();
-        if (result === '1') {
-            done();
-        }
-    });
-
     it('select', (done) => {
         let selector = new jsonpath.Selector().value(jsonObj);
         for(var i in list) {
-            if(JSON.stringify(list[i]) !== selector.path(i).selectToStr()) {
+            if(JSON.stringify(list[i]) !== JSON.stringify(selector.path(i).select())) {
                 throw `fail: ${i}`;
             }
         }
@@ -444,7 +430,7 @@ describe('README test', () => {
         let selector = new jsonpath.Selector().value(jsonObj);
 
         {
-            let jsonObj = selector.path('$..[?(@.age >= 30)]').selectAs();
+            let jsonObj = selector.path('$..[?(@.age >= 30)]').select();
             let resultObj = [{"name": "친구3", "age": 30}];
             if(JSON.stringify(jsonObj) !== JSON.stringify(resultObj)) {
                 throw 'jsonpath.Selector: $..[?(@.age >= 30)]';
@@ -452,7 +438,7 @@ describe('README test', () => {
         }
 
         {
-            let jsonObj = selector.path('$..[?(@.age == 20)]').selectAs();
+            let jsonObj = selector.path('$..[?(@.age == 20)]').select();
             let resultObj = [{"name": "친구1", "age": 20}, {"name": "친구2", "age": 20}];
             if(JSON.stringify(jsonObj) !== JSON.stringify(resultObj)) {
                 throw 'jsonpath.Selector: $..[?(@.age >= 20)]';
@@ -460,32 +446,13 @@ describe('README test', () => {
         }
 
         {
-            let jsonObj = selector.value({"friends": [ {"name": "친구5", "age": 20} ]}).selectAs();
+            let jsonObj = selector.value({"friends": [ {"name": "친구5", "age": 20} ]}).select();
             let resultObj = [{"name": "친구5", "age": 20}];
             if(JSON.stringify(jsonObj) !== JSON.stringify(resultObj)) {
                 throw 'jsonpath.Selector: change value';
             }
         }
 
-        {
-            let jsonObj1 = selector.value(jsonObj).map(function(v) {
-                let f1 = v[0];
-                f1.age = 30;
-                return v;
-            }).get();
-
-            let resultObj1 = [{"name": "친구1", "age": 30}, {"name": "친구2", "age": 20}];
-            if(JSON.stringify(jsonObj1) !== JSON.stringify(resultObj1)) {
-                throw 'jsonpath.Selector.map';
-            }
-
-            let jsonObj2 = selector.path('$..[?(@.age == 20)]').selectAs();
-            let resultObj2 = [{"name": "친구2", "age": 20}];
-            if(JSON.stringify(jsonObj2) !== JSON.stringify(resultObj2)) {
-                throw 'jsonpath.Selector.map and then select';
-            }
-        }
-
         done();
     });
 
diff --git a/src/lib.rs b/src/lib.rs
index a26e723..2a3401a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -140,7 +140,7 @@ mod select;
 
 pub use select::Selector;
 pub use select::JsonPathError;
-pub use parser::parser::Parser;
+pub use parser::parser::{Node, Parser};
 
 /// It is a high-order function. it compile a JsonPath and then returns a function. this return-function can be reused for different JsonObjects.
 ///