diff --git a/src/fs.rs b/src/fs.rs
index 3193036..d7cee44 100644
--- a/src/fs.rs
+++ b/src/fs.rs
@@ -292,6 +292,39 @@ mod tests {
     // Note this useful idiom: importing names from outer (for mod tests) scope.
     use super::*;
 
+    #[test]
+    fn test_zip_type_api() {
+        let zip = open_zip_via_read(&PathBuf::from(
+            "data/@babel-plugin-syntax-dynamic-import-npm-7.8.3-fb9ff5634a-8.zip",
+        ))
+        .unwrap();
+
+        assert_eq!(zip.file_type("node_modules").unwrap(), FileType::Directory);
+        assert_eq!(zip.file_type("node_modules/").unwrap(), FileType::Directory);
+    }
+
+    #[test]
+    #[should_panic(expected = "Kind(NotFound)")]
+    fn test_zip_type_api_not_exist_dir_with_slash() {
+        let zip = open_zip_via_read(&PathBuf::from(
+            "data/@babel-plugin-syntax-dynamic-import-npm-7.8.3-fb9ff5634a-8.zip",
+        ))
+        .unwrap();
+
+        zip.file_type("not_exists/").unwrap();
+    }
+
+    #[test]
+    #[should_panic(expected = "Kind(NotFound)")]
+    fn test_zip_type_api_not_exist_dir_without_slash() {
+        let zip = open_zip_via_read(&PathBuf::from(
+            "data/@babel-plugin-syntax-dynamic-import-npm-7.8.3-fb9ff5634a-8.zip",
+        ))
+        .unwrap();
+
+        zip.file_type("not_exists").unwrap();
+    }
+
     #[test]
     fn test_zip_list() {
         let zip = open_zip_via_read(&PathBuf::from("data/@babel-plugin-syntax-dynamic-import-npm-7.8.3-fb9ff5634a-8.zip"))
diff --git a/src/zip.rs b/src/zip.rs
index 1564c2d..64b4962 100644
--- a/src/zip.rs
+++ b/src/zip.rs
@@ -55,7 +55,7 @@ where T : AsRef<[u8]> {
     }
 
     pub fn file_type(&self, p: &str) -> Result<FileType, std::io::Error> {
-        if self.dirs.contains(p) {
+        if self.is_dir(p) {
             Ok(FileType::Directory)
         } else if self.files.contains_key(p) {
             Ok(FileType::File)
@@ -64,6 +64,14 @@ where T : AsRef<[u8]> {
         }
     }
 
+    fn is_dir(&self, p: &str) -> bool {
+        if p.ends_with('/') {
+            self.dirs.contains(p)
+        } else {
+            self.dirs.contains(&format!("{}/", p))
+        }
+    }
+
     pub fn read(&self, p: &str) -> Result<Vec<u8>, std::io::Error> {
         let entry = self.files.get(p)
             .ok_or(std::io::Error::from(std::io::ErrorKind::NotFound))?;