diff --git a/.github/workflows/linux-musl.yaml b/.github/workflows/linux-musl.yaml
index b6acf585..4ad5fe9b 100644
--- a/.github/workflows/linux-musl.yaml
+++ b/.github/workflows/linux-musl.yaml
@@ -33,7 +33,7 @@ jobs:
 
       - name: Run tests
         run: |
-          docker run --rm -v $(pwd)/.cargo:/root/.cargo -v $(pwd):/napi-rs -w /napi-rs builder cargo test -p napi-rs --lib -- --nocapture
+          docker run --rm -v $(pwd)/.cargo:/root/.cargo -v $(pwd):/napi-rs -w /napi-rs builder cargo test -p napi-sys --lib -- --nocapture
 
       - name: Unit test
         run: |
diff --git a/.github/workflows/linux.yaml b/.github/workflows/linux.yaml
index c2891f2f..d1603e6a 100644
--- a/.github/workflows/linux.yaml
+++ b/.github/workflows/linux.yaml
@@ -58,7 +58,7 @@ jobs:
         timeout-minutes: 5
         with:
           command: test
-          args: -p napi-rs --lib -- --nocapture
+          args: -p napi-sys --lib -- --nocapture
 
       - name: Unit tests
         run: |
diff --git a/.github/workflows/macos.yaml b/.github/workflows/macos.yaml
index 6df1f0f9..1f95d00a 100644
--- a/.github/workflows/macos.yaml
+++ b/.github/workflows/macos.yaml
@@ -58,7 +58,7 @@ jobs:
         timeout-minutes: 5
         with:
           command: test
-          args: -p napi-rs --lib -- --nocapture
+          args: -p napi-sys --lib -- --nocapture
 
       - name: Unit tests
         run: |
diff --git a/.github/workflows/napi3.yaml b/.github/workflows/napi3.yaml
index 1cc3afc4..57564d79 100644
--- a/.github/workflows/napi3.yaml
+++ b/.github/workflows/napi3.yaml
@@ -54,7 +54,7 @@ jobs:
         timeout-minutes: 5
         with:
           command: test
-          args: -p napi-rs --lib -- --nocapture
+          args: -p napi-sys --lib -- --nocapture
 
       - name: Unit tests
         run: |
diff --git a/.github/workflows/windows.yaml b/.github/workflows/windows.yaml
index 1b2edc67..bcffd24f 100644
--- a/.github/workflows/windows.yaml
+++ b/.github/workflows/windows.yaml
@@ -57,14 +57,14 @@ jobs:
         uses: actions-rs/cargo@v1
         with:
           command: check
-          args: -p napi-rs -vvv
+          args: --all --bins --examples --tests -vvv
 
       - name: Tests
         uses: actions-rs/cargo@v1
         timeout-minutes: 5
         with:
           command: test
-          args: -p napi-rs --lib -- --nocapture
+          args: -p napi-sys --lib -- --nocapture
 
       - name: Unit tests
         run: |
diff --git a/.gitignore b/.gitignore
index 4ca1652d..890bcaab 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,6 +9,7 @@ build/LICENSE
 napi/LICENSE
 napi/README.md
 napi-derive/LICENSE
+sys/LICENSE
 
 # Created by https://www.gitignore.io/api/node
 # Edit at https://www.gitignore.io/?templates=node
diff --git a/Cargo.toml b/Cargo.toml
index 9ff9fe0d..21784d41 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,6 +3,7 @@ members = [
   "./build",
   "./napi",
   "./napi-derive",
-  "./napi-derive-example"
+  "./napi-derive-example",
+  "./sys"
 ]
 exclude = ["./test_module"]
diff --git a/napi-derive-example/Cargo.toml b/napi-derive-example/Cargo.toml
index 3191fc82..ffb64382 100644
--- a/napi-derive-example/Cargo.toml
+++ b/napi-derive-example/Cargo.toml
@@ -8,8 +8,8 @@ edition = "2018"
 crate-type = ["cdylib"]
 
 [dependencies]
-napi-rs = { path = "../napi" }
-napi-rs-derive = { path = "../napi-derive" }
+napi = { path = "../napi" }
+napi-derive = { path = "../napi-derive" }
 
 [build-dependencies]
 napi-build = { path = "../build" }
diff --git a/napi-derive-example/src/lib.rs b/napi-derive-example/src/lib.rs
index b283d0ae..739eb0d3 100644
--- a/napi-derive-example/src/lib.rs
+++ b/napi-derive-example/src/lib.rs
@@ -1,7 +1,7 @@
 #[macro_use]
-extern crate napi_rs as napi;
+extern crate napi;
 #[macro_use]
-extern crate napi_rs_derive;
+extern crate napi_derive;
 
 use napi::{CallContext, Error, JsNumber, JsUnknown, Module, Result, Status};
 use std::convert::TryInto;
diff --git a/napi-derive/Cargo.toml b/napi-derive/Cargo.toml
index e304b670..b8d025c9 100644
--- a/napi-derive/Cargo.toml
+++ b/napi-derive/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
-name = "napi-rs-derive"
-version = "0.2.0"
+name = "napi-derive"
+version = "0.4.0"
 authors = ["LongYinan <lynweklm@gmail.com>"]
 edition = "2018"
 description = "N-API procedural macros"
diff --git a/napi-derive/src/lib.rs b/napi-derive/src/lib.rs
index 85168638..77a0d350 100644
--- a/napi-derive/src/lib.rs
+++ b/napi-derive/src/lib.rs
@@ -82,24 +82,24 @@ pub fn js_function(attr: TokenStream, input: TokenStream) -> TokenStream {
     #signature #(#fn_block)*
 
     #visibility extern "C" fn #fn_name(
-      raw_env: napi_rs::sys::napi_env,
-      cb_info: napi_rs::sys::napi_callback_info,
-    ) -> napi_rs::sys::napi_value {
+      raw_env: napi::sys::napi_env,
+      cb_info: napi::sys::napi_callback_info,
+    ) -> napi::sys::napi_value {
       use std::io::Write;
       use std::mem;
       use std::os::raw::c_char;
       use std::ptr;
       use std::ffi::CString;
-      use napi_rs::{JsUnknown, Env, Status, NapiValue, CallContext};
+      use napi::{JsUnknown, Env, Status, NapiValue, CallContext};
       let mut argc = #arg_len_span as usize;
       let mut raw_args =
-      unsafe { mem::MaybeUninit::<[napi_rs::sys::napi_value; #arg_len_span as usize]>::uninit().assume_init() };
+      unsafe { mem::MaybeUninit::<[napi::sys::napi_value; #arg_len_span as usize]>::uninit().assume_init() };
       let mut raw_this = ptr::null_mut();
 
       let mut has_error = false;
 
       unsafe {
-        let status = napi_rs::sys::napi_get_cb_info(
+        let status = napi::sys::napi_get_cb_info(
           raw_env,
           cb_info,
           &mut argc as *mut usize as *mut u64,
@@ -120,10 +120,10 @@ pub fn js_function(attr: TokenStream, input: TokenStream) -> TokenStream {
         Err(e) => {
           let message = format!("{}", e);
           unsafe {
-            napi_rs::sys::napi_throw_error(raw_env, ptr::null(), CString::from_vec_unchecked(message.into()).as_ptr() as *const c_char);
+            napi::sys::napi_throw_error(raw_env, ptr::null(), CString::from_vec_unchecked(message.into()).as_ptr() as *const c_char);
           }
           let mut undefined = ptr::null_mut();
-          unsafe { napi_rs::sys::napi_get_undefined(raw_env, &mut undefined) };
+          unsafe { napi::sys::napi_get_undefined(raw_env, &mut undefined) };
           undefined
         }
       }
diff --git a/napi/Cargo.toml b/napi/Cargo.toml
index cd0e23b5..a9ef3848 100644
--- a/napi/Cargo.toml
+++ b/napi/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
-name = "napi-rs"
-version = "0.3.1"
+name = "napi"
+version = "0.4.0"
 authors = ["Nathan Sobo <nathan@github.com>", "Yinan Long <lynweklm@gmail.com>"]
 license = "MIT"
 description = "N-API bindings"
@@ -13,6 +13,9 @@ edition = "2018"
 libuv = ["futures"]
 tokio_rt = ["futures", "tokio", "once_cell"]
 
+[dependencies]
+napi-sys = { version = "0.4", path = "../sys" }
+
 [dependencies.futures]
 version = "0.3"
 optional = true
@@ -27,14 +30,5 @@ version = "1.4"
 optional = true
 
 
-[target.'cfg(windows)'.build-dependencies]
-flate2 = "1.0"
-reqwest = { version = "0.10", features = ["native-tls", "blocking"] }
-tar = "0.4"
-
 [build-dependencies]
-bindgen = "0.54"
-glob = "0.3"
 napi-build = { version = "0.1", path = "../build" }
-regex = "1.3"
-semver = "0.10"
diff --git a/napi/build.rs b/napi/build.rs
index f80d29ad..1f866b6a 100644
--- a/napi/build.rs
+++ b/napi/build.rs
@@ -1,118 +1,5 @@
-extern crate bindgen;
-#[cfg(windows)]
-extern crate flate2;
-extern crate glob;
 extern crate napi_build;
-#[cfg(windows)]
-extern crate reqwest;
-extern crate semver;
-#[cfg(windows)]
-extern crate tar;
-
-use glob::glob;
-
-use std::env;
-use std::path::PathBuf;
-use std::process::Command;
-
-// https://stackoverflow.com/questions/37498864/finding-executable-in-path-with-rust
-
-const NODE_PRINT_EXEC_PATH: &'static str = "console.log(process.execPath)";
 
 fn main() {
   napi_build::setup();
-  let node_full_version =
-    String::from_utf8(Command::new("node").arg("-v").output().unwrap().stdout).unwrap();
-  let node_version = semver::Version::parse(node_full_version.as_str().get(1..).unwrap()).unwrap();
-
-  let node_major_version = node_version.major;
-
-  println!("cargo:rerun-if-env-changed=NODE_INCLUDE_PATH");
-  for entry in glob("./src/sys/**/*.*").unwrap() {
-    println!(
-      "cargo:rerun-if-changed={}",
-      entry.unwrap().to_str().unwrap()
-    );
-  }
-
-  if node_major_version < 10 {
-    panic!("node version is too low")
-  }
-
-  let node_include_path = find_node_include_path(node_full_version.trim_end());
-
-  let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
-
-  let mut sys_bindigs_path = PathBuf::from("src");
-  sys_bindigs_path.push("sys");
-  sys_bindigs_path.push("bindings.h");
-
-  bindgen::Builder::default()
-    .header(sys_bindigs_path.to_str().unwrap().to_owned())
-    .clang_arg(String::from("-I") + node_include_path.to_str().unwrap())
-    .rustified_enum("(napi_|uv_).+")
-    .whitelist_function("(napi_|uv_|extras_).+")
-    .whitelist_type("(napi_|uv_|extras_).+")
-    .generate()
-    .expect("Unable to generate napi bindings")
-    .write_to_file(out_path.join("bindings.rs"))
-    .expect("Unable to write napi bindings");
-}
-
-#[cfg(target_os = "windows")]
-fn find_node_include_path(node_full_version: &str) -> PathBuf {
-  let mut node_exec_path = PathBuf::from(
-    String::from_utf8(
-      Command::new("node")
-        .arg("-e")
-        .arg(NODE_PRINT_EXEC_PATH)
-        .output()
-        .unwrap()
-        .stdout,
-    )
-    .expect("can not find executable node"),
-  )
-  .parent()
-  .unwrap()
-  .to_path_buf();
-  node_exec_path.push(format!("node-headers-{}.tar.gz", node_full_version));
-  let mut header_dist_path = PathBuf::from(&PathBuf::from(&node_exec_path).parent().unwrap());
-  let unpack_path = PathBuf::from(&header_dist_path);
-  header_dist_path.push(format!("node-{}", node_full_version));
-  header_dist_path.push("include");
-  header_dist_path.push("node");
-  if !header_dist_path.exists() {
-    let header_file_download_url = String::from_utf8(
-      Command::new("node")
-        .args(vec!["-e", "console.log(process.release.headersUrl)"])
-        .output()
-        .unwrap()
-        .stdout,
-    )
-    .unwrap();
-    let resp = reqwest::blocking::get(&header_file_download_url).expect("request failed");
-    tar::Archive::new(flate2::read::GzDecoder::new(resp))
-      .unpack(&unpack_path)
-      .expect("Unpack headers file failed");
-  };
-  header_dist_path
-}
-
-#[cfg(not(target_os = "windows"))]
-fn find_node_include_path(_node_full_version: &str) -> PathBuf {
-  let node_exec_path = String::from_utf8(
-    Command::new("node")
-      .arg("-e")
-      .arg(NODE_PRINT_EXEC_PATH)
-      .output()
-      .unwrap()
-      .stdout,
-  )
-  .unwrap();
-  PathBuf::from(node_exec_path)
-    .parent()
-    .unwrap()
-    .parent()
-    .unwrap()
-    .join("include/node")
 }
diff --git a/napi/src/lib.rs b/napi/src/lib.rs
index 108336c6..2df52218 100644
--- a/napi/src/lib.rs
+++ b/napi/src/lib.rs
@@ -65,7 +65,6 @@ mod module;
 #[cfg(all(feature = "libuv", napi4))]
 mod promise;
 mod status;
-pub mod sys;
 mod task;
 #[cfg(napi4)]
 pub mod threadsafe_function;
@@ -75,6 +74,8 @@ mod tokio_rt;
 mod uv;
 mod version;
 
+pub use napi_sys as sys;
+
 pub use call_context::CallContext;
 pub use env::*;
 pub use error::{Error, Result};
diff --git a/sys/Cargo.toml b/sys/Cargo.toml
new file mode 100644
index 00000000..a92e08a5
--- /dev/null
+++ b/sys/Cargo.toml
@@ -0,0 +1,20 @@
+[package]
+name = "napi-sys"
+version = "0.4.0"
+authors = ["LongYinan <lynweklm@gmail.com>"]
+edition = "2018"
+readme = "README.md"
+repository = "https://github.com/Brooooooklyn/napi-rs"
+license = "MIT"
+keywords = ["NodeJS", "FFI", "NAPI", "n-api"]
+
+[target.'cfg(windows)'.build-dependencies]
+flate2 = "1.0"
+reqwest = { version = "0.10", features = ["native-tls", "blocking"] }
+tar = "0.4"
+
+[build-dependencies]
+bindgen = "0.54"
+glob = "0.3"
+regex = "1.3"
+semver = "0.10"
diff --git a/sys/README.md b/sys/README.md
new file mode 100644
index 00000000..171f1317
--- /dev/null
+++ b/sys/README.md
@@ -0,0 +1,5 @@
+# napi-sys
+
+Low-level N-API bindings for Node.js addons written in Rust.
+
+See the [napi](https://github.com/napi-rs/napi-rs) for the high-level API.
diff --git a/sys/build.rs b/sys/build.rs
new file mode 100644
index 00000000..aff9e17a
--- /dev/null
+++ b/sys/build.rs
@@ -0,0 +1,115 @@
+extern crate bindgen;
+#[cfg(windows)]
+extern crate flate2;
+extern crate glob;
+#[cfg(windows)]
+extern crate reqwest;
+extern crate semver;
+#[cfg(windows)]
+extern crate tar;
+
+use glob::glob;
+
+use std::env;
+use std::path::PathBuf;
+use std::process::Command;
+
+// https://stackoverflow.com/questions/37498864/finding-executable-in-path-with-rust
+
+const NODE_PRINT_EXEC_PATH: &'static str = "console.log(process.execPath)";
+
+fn main() {
+  let node_full_version =
+    String::from_utf8(Command::new("node").arg("-v").output().unwrap().stdout).unwrap();
+  let node_version = semver::Version::parse(node_full_version.as_str().get(1..).unwrap()).unwrap();
+
+  let node_major_version = node_version.major;
+
+  println!("cargo:rerun-if-env-changed=NODE_INCLUDE_PATH");
+  for entry in glob("./src/**/*.*").unwrap() {
+    println!(
+      "cargo:rerun-if-changed={}",
+      entry.unwrap().to_str().unwrap()
+    );
+  }
+
+  if node_major_version < 10 {
+    panic!("node version is too low")
+  }
+
+  let node_include_path = find_node_include_path(node_full_version.trim_end());
+
+  let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
+
+  let mut sys_bindigs_path = PathBuf::from("src");
+  sys_bindigs_path.push("bindings.h");
+
+  bindgen::Builder::default()
+    .header(sys_bindigs_path.to_str().unwrap().to_owned())
+    .clang_arg(String::from("-I") + node_include_path.to_str().unwrap())
+    .rustified_enum("(napi_|uv_).+")
+    .whitelist_function("(napi_|uv_|extras_).+")
+    .whitelist_type("(napi_|uv_|extras_).+")
+    .generate()
+    .expect("Unable to generate napi bindings")
+    .write_to_file(out_path.join("bindings.rs"))
+    .expect("Unable to write napi bindings");
+}
+
+#[cfg(target_os = "windows")]
+fn find_node_include_path(node_full_version: &str) -> PathBuf {
+  let mut node_exec_path = PathBuf::from(
+    String::from_utf8(
+      Command::new("node")
+        .arg("-e")
+        .arg(NODE_PRINT_EXEC_PATH)
+        .output()
+        .unwrap()
+        .stdout,
+    )
+    .expect("can not find executable node"),
+  )
+  .parent()
+  .unwrap()
+  .to_path_buf();
+  node_exec_path.push(format!("node-headers-{}.tar.gz", node_full_version));
+  let mut header_dist_path = PathBuf::from(&PathBuf::from(&node_exec_path).parent().unwrap());
+  let unpack_path = PathBuf::from(&header_dist_path);
+  header_dist_path.push(format!("node-{}", node_full_version));
+  header_dist_path.push("include");
+  header_dist_path.push("node");
+  if !header_dist_path.exists() {
+    let header_file_download_url = String::from_utf8(
+      Command::new("node")
+        .args(vec!["-e", "console.log(process.release.headersUrl)"])
+        .output()
+        .unwrap()
+        .stdout,
+    )
+    .unwrap();
+    let resp = reqwest::blocking::get(&header_file_download_url).expect("request failed");
+    tar::Archive::new(flate2::read::GzDecoder::new(resp))
+      .unpack(&unpack_path)
+      .expect("Unpack headers file failed");
+  };
+  header_dist_path
+}
+
+#[cfg(not(target_os = "windows"))]
+fn find_node_include_path(_node_full_version: &str) -> PathBuf {
+  let node_exec_path = String::from_utf8(
+    Command::new("node")
+      .arg("-e")
+      .arg(NODE_PRINT_EXEC_PATH)
+      .output()
+      .unwrap()
+      .stdout,
+  )
+  .unwrap();
+  PathBuf::from(node_exec_path)
+    .parent()
+    .unwrap()
+    .parent()
+    .unwrap()
+    .join("include/node")
+}
diff --git a/napi/src/sys/bindings.h b/sys/src/bindings.h
similarity index 100%
rename from napi/src/sys/bindings.h
rename to sys/src/bindings.h
diff --git a/sys/src/lib.rs b/sys/src/lib.rs
new file mode 100644
index 00000000..644a4ab9
--- /dev/null
+++ b/sys/src/lib.rs
@@ -0,0 +1,2 @@
+mod sys;
+pub use sys::*;
diff --git a/napi/src/sys/mod.rs b/sys/src/sys.rs
similarity index 100%
rename from napi/src/sys/mod.rs
rename to sys/src/sys.rs
diff --git a/test_module/Cargo.toml b/test_module/Cargo.toml
index 9d8705a5..c0e3f30d 100644
--- a/test_module/Cargo.toml
+++ b/test_module/Cargo.toml
@@ -9,8 +9,8 @@ crate-type = ["cdylib"]
 
 [dependencies]
 futures = "0.3"
-napi-rs = { path = "../napi", features = ["libuv", "tokio_rt"] }
-napi-rs-derive = { path = "../napi-derive" }
+napi = { path = "../napi", features = ["libuv", "tokio_rt"] }
+napi-derive = { path = "../napi-derive" }
 tokio = { version = "0.2", features = ["default", "fs"]}
 
 [build-dependencies]
diff --git a/test_module/src/lib.rs b/test_module/src/lib.rs
index e72ec243..b0711945 100644
--- a/test_module/src/lib.rs
+++ b/test_module/src/lib.rs
@@ -1,7 +1,7 @@
 #[macro_use]
-extern crate napi_rs as napi;
+extern crate napi;
 #[macro_use]
-extern crate napi_rs_derive;
+extern crate napi_derive;
 
 use napi::{CallContext, Error, JsString, JsUnknown, Module, Result, Status};