diff --git a/Cargo.toml b/Cargo.toml
index 6d44cf3..58bf4e9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,14 +1,20 @@
 [package]
 name = "rust_util"
-version = "0.6.7"
+version = "0.6.8"
 authors = ["Hatter Jiang <jht5945@gmail.com>"]
 edition = "2018"
 description = "Hatter's Rust Util"
 license = "MIT"
 readme = "README.md"
 
+[features]
+default = [] #["serde", "serde_json"]
+use_serde = ["serde", "serde_json"]
+
 [dependencies]
 libc = "0.2.65"
 term = "0.5.2"
 term_size = "0.3.1"
 lazy_static = "1.3.0"
+serde = { version = "1.0", features = ["derive"], optional = true }
+serde_json = { version = "1.0", optional = true }
diff --git a/src/util_file.rs b/src/util_file.rs
index 87123bc..9e54b82 100644
--- a/src/util_file.rs
+++ b/src/util_file.rs
@@ -118,6 +118,26 @@ pub fn find_parents_exists_dir(dir: &str) -> Option<PathBuf> {
     }
 }
 
+#[cfg(feature = "use_serde")]
+pub fn read_json_config<T>(config: Option<String>, files: &[String]) -> XResult<Option<(PathBuf, T)>> {
+    let config_path_buf_opt = read_config(config, files);
+    match config_path_buf_opt {
+        None => Ok(None),
+        Some(config_path_buf) => {
+            information!("Read config: {}", config_path_buf);
+            let config_content = fs::read_to_string(config_path_buf)?;
+            Ok(Some((config_path_buf, serde_json::from_str(&config_content)?)))
+        }
+    }
+}
+
+pub fn read_config(config: Option<String>, files: &[String]) -> Option<PathBuf> {
+    match config {
+        Some(config_str) => Some(PathBuf::from(config_str)),
+        None => locate_file(files),
+    }
+}
+
 pub fn locate_file(files: &[String]) -> Option<PathBuf> {
     for f in files {
         match PathBuf::from(&resolve_file_path(f)) {
diff --git a/src/util_msg.rs b/src/util_msg.rs
index e9cfd01..3a6d680 100644
--- a/src/util_msg.rs
+++ b/src/util_msg.rs
@@ -1,15 +1,47 @@
 use std::{
+    env,
     io::{ self, Write },
     sync::{ Arc, Mutex },
 };
 
 lazy_static! {
     pub static ref IS_ATTY: bool = is_atty();
+    static ref LOGGER_LEVEL: MessageType = get_logger_level();
     static ref PRINT_MESSAGE_LOCK: Arc<Mutex<()>> = Arc::new(Mutex::new(()));
 }
 
 #[derive(Clone, Copy)]
-pub enum MessageType { INFO, OK, WARN, ERROR, DEBUG, }
+pub enum MessageType { DEBUG, INFO, OK, WARN, ERROR, }
+
+impl MessageType {
+    pub fn get_u8_value(&self) -> u8 {
+        match self {
+            MessageType::DEBUG => 0,
+            MessageType::INFO  => 1,
+            MessageType::OK    => 2,
+            MessageType::WARN  => 3,
+            MessageType::ERROR => 4,
+        }
+    }
+}
+
+pub fn get_logger_level() -> MessageType {
+    if let Some(logger_level) = env::var("LOGGER_LEVEL").ok().or(env::var("LOGGER").ok()).or(env::var("LEVEL").ok()) {
+        match logger_level.trim().to_lowercase().as_str() {
+            "debug" => MessageType::DEBUG,
+            "info" => MessageType::INFO,
+            "ok" => MessageType::OK,
+            "warn" => MessageType::WARN,
+            "error" => MessageType::ERROR,
+            _ => {
+                print_message_ex(Some(term::color::YELLOW), "[WARN ]", &format!("Unknown logger level: {}, set to default INFO", logger_level));
+                MessageType::INFO
+            },
+        }
+    } else {
+        MessageType::INFO
+    }
+}
 
 pub fn is_atty() -> bool {
     let stdout_fileno = unsafe { libc::isatty(libc::STDOUT_FILENO as i32) };
@@ -55,12 +87,15 @@ pub fn print_info (message: &str) { print_message(MessageType::INFO,  message);
 pub fn print_debug(message: &str) { print_message(MessageType::DEBUG, message); }
 
 pub fn print_message(mt: MessageType, message: &str) {
-    match mt {
-        MessageType::OK    => print_message_ex(Some(term::color::GREEN),   "[OK   ]", message),
-        MessageType::WARN  => print_message_ex(Some(term::color::YELLOW),  "[WARN ]", message),
-        MessageType::ERROR => print_message_ex(Some(term::color::RED),     "[ERROR]", message),
-        MessageType::INFO  => print_message_ex(None,                       "[INFO ]", message),
-        MessageType::DEBUG => print_message_ex(Some(term::color::MAGENTA), "[DEBUG]", message),
+    let logger_level = *LOGGER_LEVEL;
+    if mt.get_u8_value() >= logger_level.get_u8_value() {
+        match mt {
+            MessageType::OK    => print_message_ex(Some(term::color::GREEN),   "[OK   ]", message),
+            MessageType::WARN  => print_message_ex(Some(term::color::YELLOW),  "[WARN ]", message),
+            MessageType::ERROR => print_message_ex(Some(term::color::RED),     "[ERROR]", message),
+            MessageType::INFO  => print_message_ex(None,                       "[INFO ]", message),
+            MessageType::DEBUG => print_message_ex(Some(term::color::MAGENTA), "[DEBUG]", message),
+        }
     }
 }