diff --git a/__test__/index.spec.js b/__test__/index.spec.js
index f36194d..3fc875d 100644
--- a/__test__/index.spec.js
+++ b/__test__/index.spec.js
@@ -1,11 +1,14 @@
 const test = require('ava')
 
-const { diff } = require('../index')
+const { diffChars } = require('../index')
 
-test('diff', (t) => {
+test('diff chars', (t) => {
   const left = 'asd'
   const right = 'asd'
-  const result = diff(left, right)
-  console.log(result)
+  const result = diffChars(left, right)
   t.is(result.length, 1)
+  t.is(result[0].count, 3)
+  t.is(result[0].value, 'asd')
+  t.is(result[0].added, false)
+  t.is(result[0].removed, false)
 })
diff --git a/index.d.ts b/index.d.ts
index aa31e57..a79daa6 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -2,3 +2,8 @@ export const diffChars: (
   left: string,
   right: string,
 ) => [{ count: number; value: string; added: boolean; removed: boolean }]
+
+export const diffLines: (
+  left: string,
+  right: string,
+) => [{ count: number; value: string; added: boolean; removed: boolean }]
diff --git a/index.js b/index.js
index e0c7789..1f42359 100644
--- a/index.js
+++ b/index.js
@@ -1,12 +1,12 @@
-const path = require("path");
 const { loadBinding } = require("@node-rs/helper");
 
 try {
   // __dirname means load native addon from current dir
   // 'index' means native addon name is `index`
   // the value of this two arguments was decided by `build` script in `package.json`
-  module.exports = loadBinding(path.join(__dirname, "index", "@mtfos/rs-diff"));
+  module.exports = loadBinding(__dirname, "index", "@mtfos/rs-diff");
 } catch (e) {
+  console.log(e);
   try {
     module.exports = require(`@mtfos/rs-diff-${process.platform}`);
   } catch (e) {
diff --git a/package-lock.json b/package-lock.json
index 5d22953..a06419f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -99,6 +99,18 @@
         }
       }
     },
+    "@mtfos/rs-diff-darwin": {
+      "version": "0.0.6",
+      "resolved": "https://npm.trj.tw/@mtfos%2frs-diff-darwin/-/rs-diff-darwin-0.0.6.tgz",
+      "integrity": "sha512-Qhu9vfTdUoIGcJl4uuaeb4fjU64RNozqmfGZzdMtzruOZmI0sLZJInBm4ZjtVXGjowrtuzeLtqNB+e0a0cbCRA==",
+      "optional": true
+    },
+    "@mtfos/rs-diff-linux": {
+      "version": "0.0.6",
+      "resolved": "https://npm.trj.tw/@mtfos%2frs-diff-linux/-/rs-diff-linux-0.0.6.tgz",
+      "integrity": "sha512-wQwnstELnuVH/6BXtrgDG7SmJtlM4UO13MK0Q+zUFvr7IOdOVdX8oqet/4WEOtful7iid2KlYWnu0xXJG2XIyQ==",
+      "optional": true
+    },
     "@node-rs/helper": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/@node-rs/helper/-/helper-0.4.0.tgz",
diff --git a/package.json b/package.json
index 5c4be8e..9accb6d 100644
--- a/package.json
+++ b/package.json
@@ -50,4 +50,4 @@
     "@mtfos/rs-diff-darwin": "^0.0.6",
     "@mtfos/rs-diff-linux": "^0.0.6"
   }
-}
\ No newline at end of file
+}
diff --git a/src/lib.rs b/src/lib.rs
index 59af173..7a33f81 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -17,6 +17,7 @@ register_module!(example, init);
 
 fn init(module: &mut Module) -> Result<()> {
   module.create_named_method("diffChars", diff_char)?;
+  module.create_named_method("diffLines", diff_line)?;
   Ok(())
 }
 
@@ -32,7 +33,34 @@ fn diff_char(ctx: CallContext) -> Result<JsObject> {
   let mut idx = 0;
   for it in res.iter() {
     let mut item = ctx.env.create_object().unwrap();
-    
+
+    item.set_named_property(
+      "count",
+      ctx.env.create_int64(it.count.try_into().unwrap()).unwrap(),
+    )?;
+    item.set_named_property("value", ctx.env.create_string(&it.value).unwrap())?;
+    item.set_named_property("added", ctx.env.get_boolean(it.added).unwrap())?;
+    item.set_named_property("removed", ctx.env.get_boolean(it.removed).unwrap())?;
+
+    obj.set_element(idx, item)?;
+    idx += 1;
+  }
+
+  Ok(obj)
+}
+
+#[js_function(2)]
+fn diff_line(ctx: CallContext) -> Result<JsObject> {
+  let str1: String = ctx.get::<JsString>(0)?.try_into()?;
+  let str2: String = ctx.get::<JsString>(1)?.try_into()?;
+  let res = mdiff::diff_lines(str1.as_str(), str2.as_str());
+
+  let mut obj = ctx.env.create_array_with_length(res.len()).unwrap();
+  let mut idx = 0;
+
+  for it in res.iter() {
+    let mut item = ctx.env.create_object().unwrap();
+
     item.set_named_property(
       "count",
       ctx.env.create_int64(it.count.try_into().unwrap()).unwrap(),
diff --git a/src/mdiff.rs b/src/mdiff.rs
index 9cbeeff..1b6531c 100644
--- a/src/mdiff.rs
+++ b/src/mdiff.rs
@@ -13,6 +13,14 @@ pub enum Mode {
   RIGHT,
 }
 
+fn get_line_res(s: &String, mode: Mode) -> Res {
+  Res {
+    count: s.split('\n').count(),
+    added: if mode == Mode::RIGHT { true } else { false },
+    removed: if mode == Mode::LEFT { true } else { false },
+    value: s.clone(),
+  }
+}
 fn get_res(s: &String, mode: Mode) -> Res {
   Res {
     count: s.chars().count(),
@@ -64,3 +72,54 @@ pub fn diff_chars(s1: &str, s2: &str) -> Vec<Res> {
 
   result
 }
+
+pub fn diff_lines(s1: &str, s2: &str) -> Vec<Res> {
+  let mut result: Vec<Res> = Vec::new();
+  let mut mode = Mode::INIT;
+  let mut s: String = String::new();
+
+  for d in diff::lines(s1, s2) {
+    match d {
+      diff::Result::Left(l) => {
+        if mode != Mode::LEFT && mode != Mode::INIT {
+          result.push(get_line_res(&s, mode));
+          s.clear();
+        }
+        mode = Mode::LEFT;
+        if s.len() > 0 {
+          s.push('\n')
+        }
+        s.push_str(l);
+      }
+      diff::Result::Right(r) => {
+        if mode != Mode::RIGHT && mode != Mode::INIT {
+          result.push(get_line_res(&s, mode));
+          s.clear();
+        }
+        mode = Mode::RIGHT;
+        if s.len() > 0 {
+          s.push('\n')
+        }
+        s.push_str(r);
+      }
+      diff::Result::Both(l, _) => {
+        if mode != Mode::BOTH && mode != Mode::INIT {
+          result.push(get_line_res(&s, mode));
+          s.clear()
+        }
+        mode = Mode::BOTH;
+        if s.len() > 0 {
+          s.push('\n')
+        }
+        s.push_str(l);
+      }
+    }
+  }
+
+  if s.len() > 0 {
+    result.push(get_line_res(&s, mode));
+    s.clear();
+  }
+
+  result
+}