diff --git a/.travis.yml b/.travis.yml
index 818141c..66bee5a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -29,6 +29,8 @@ matrix:
         - cargo build --verbose --all
         - cargo clippy --all-targets --all-features -- -D warnings -A clippy::cognitive_complexity
         - cargo test --verbose --all
+        - cd wasm && cargo clippy -- -D warnings -A clippy::suspicious_else_formatting
+        - cd ../nodejs/native && cargo clippy -- -D warnings
       after_success: |
         cargo tarpaulin --exclude-files nodejs wasm parser/mod.rs --out Xml
         bash <(curl -s https://codecov.io/bash)
diff --git a/build.sh b/build.sh
index 1d03efb..b9fbf00 100755
--- a/build.sh
+++ b/build.sh
@@ -2,9 +2,6 @@
 
 set -e
 
-cargo clippy -- -D warnings && \
-cargo clippy --all-targets --all-features -- -D warnings -A clippy::cognitive_complexity
-
 # project_root
 DIR="$(pwd)"
 WASM="${DIR}"/wasm
@@ -31,6 +28,16 @@ __cargo_clean () {
         cd "${DIR}" && cargo clean
 }
 
+if [ "$1" = "clippy" ]
+then
+    echo
+    __msg "clippy"
+    cargo clippy -- -D warnings && \
+    cargo clippy --all-targets --all-features -- -D warnings -A clippy::cognitive_complexity && \
+    cd "${WASM}" && cargo clippy -- -A clippy::suspicious_else_formatting && \
+    cd "${NODEJS}" && cargo clippy
+fi
+
 echo
 __msg "clean"
 rm -rf \
diff --git a/nodejs/native/src/lib.rs b/nodejs/native/src/lib.rs
index 7e36356..0fa84f3 100644
--- a/nodejs/native/src/lib.rs
+++ b/nodejs/native/src/lib.rs
@@ -206,7 +206,7 @@ declare_types! {
             {
                 let guard = ctx.lock();
                 let mut this = this.borrow_mut(&guard);
-                let _ = this.path(&path);
+                this.path(&path);
             }
 
             Ok(JsUndefined::new().upcast())
@@ -219,7 +219,7 @@ declare_types! {
             {
                 let guard = ctx.lock();
                 let mut this = this.borrow_mut(&guard);
-                let _ = this.value(&json_str);
+                this.value(&json_str);
             }
 
             Ok(JsUndefined::new().upcast())
diff --git a/src/lib.rs b/src/lib.rs
index 65cd66c..80e9cbb 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -132,6 +132,7 @@ extern crate serde_json;
 
 use serde_json::Value;
 
+pub use parser::Parser;
 pub use select::JsonPathError;
 pub use select::{Selector, SelectorMut};
 
diff --git a/wasm/src/lib.rs b/wasm/src/lib.rs
index ec1b8bf..cf0fb7d 100644
--- a/wasm/src/lib.rs
+++ b/wasm/src/lib.rs
@@ -102,7 +102,7 @@ pub fn compile(path: &str) -> JsValue {
             },
             Err(e) => JsValue::from_str(&format!("{:?}", e)),
         }
-    }) as Box<Fn(JsValue) -> JsValue>);
+    }) as Box<dyn Fn(JsValue) -> JsValue>);
 
     let ret = cb.as_ref().clone();
     cb.forget();
@@ -131,8 +131,8 @@ pub fn selector(js_value: JsValue) -> JsValue {
                     Err(e) => JsValue::from_str(&format!("{:?}", e)),
                 }
             }
-            Err(e) => return JsValue::from_str(&format!("{:?}", JsonPathError::Path(e))),
-        }) as Box<Fn(String) -> JsValue>,
+            Err(e) => JsValue::from_str(&format!("{:?}", JsonPathError::Path(e))),
+        }) as Box<dyn Fn(String) -> JsValue>,
     );
 
     let ret = cb.as_ref().clone();
@@ -193,6 +193,7 @@ pub fn replace_with(js_value: JsValue, path: &str, fun: js_sys::Function) -> JsV
 /// lifetime 제약으로 Selector를 사용 할 수 없다.
 ///
 #[wasm_bindgen]
+#[derive(Default)]
 pub struct Selector {
     path: Option<String>,
     value: Option<Value>,
@@ -202,10 +203,7 @@ pub struct Selector {
 impl Selector {
     #[wasm_bindgen(constructor)]
     pub fn new() -> Self {
-        Selector {
-            path: None,
-            value: None,
-        }
+        Selector::default()
     }
 
     #[wasm_bindgen(catch)]
@@ -263,6 +261,7 @@ impl Selector {
 /// `wasm_bindgen` 제약으로 builder-pattern을 구사 할 수 없다.
 ///
 #[wasm_bindgen]
+#[derive(Default)]
 pub struct SelectorMut {
     path: Option<String>,
     value: Option<Value>,
@@ -272,10 +271,7 @@ pub struct SelectorMut {
 impl SelectorMut {
     #[wasm_bindgen(constructor)]
     pub fn new() -> Self {
-        SelectorMut {
-            path: None,
-            value: None,
-        }
+        SelectorMut::default()
     }
 
     #[wasm_bindgen(catch)]