diff --git a/src/config.rs b/src/config.rs
index 3384e0b..3387549 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -1,3 +1,4 @@
+use crate::log::LogLevel;
 use crate::Key;
 use serde::Deserialize;
 use std::fmt;
@@ -17,6 +18,8 @@ pub struct Config {
     pub conn: Vec<Connection>,
     #[serde(default)]
     pub key_config: KeyConfig,
+    #[serde(default)]
+    pub log_level: LogLevel,
 }
 
 #[derive(Debug, Deserialize, Clone)]
@@ -51,6 +54,7 @@ impl Default for Config {
                 database: None,
             }],
             key_config: KeyConfig::default(),
+            log_level: LogLevel::default(),
         }
     }
 }
@@ -159,15 +163,15 @@ impl Connection {
                 let user = self
                     .user
                     .as_ref()
-                    .ok_or_else(|| anyhow::anyhow!("user is not set"))?;
+                    .ok_or_else(|| anyhow::anyhow!("type mysql needs the user field"))?;
                 let host = self
                     .host
                     .as_ref()
-                    .ok_or_else(|| anyhow::anyhow!("host is not set"))?;
+                    .ok_or_else(|| anyhow::anyhow!("type mysql needs the host field"))?;
                 let port = self
                     .port
                     .as_ref()
-                    .ok_or_else(|| anyhow::anyhow!("port is not set"))?;
+                    .ok_or_else(|| anyhow::anyhow!("type mysql needs the port field"))?;
 
                 match self.database.as_ref() {
                     Some(database) => Ok(format!(
@@ -189,15 +193,15 @@ impl Connection {
                 let user = self
                     .user
                     .as_ref()
-                    .ok_or_else(|| anyhow::anyhow!("user is not set"))?;
+                    .ok_or_else(|| anyhow::anyhow!("type postgres needs the user field"))?;
                 let host = self
                     .host
                     .as_ref()
-                    .ok_or_else(|| anyhow::anyhow!("host is not set"))?;
+                    .ok_or_else(|| anyhow::anyhow!("type postgres needs the host field"))?;
                 let port = self
                     .port
                     .as_ref()
-                    .ok_or_else(|| anyhow::anyhow!("port is not set"))?;
+                    .ok_or_else(|| anyhow::anyhow!("type postgres needs the port field"))?;
 
                 match self.database.as_ref() {
                     Some(database) => Ok(format!(
@@ -216,12 +220,10 @@ impl Connection {
                 }
             }
             DatabaseType::Sqlite => {
-                let path = self
-                    .path
-                    .as_ref()
-                    .map_or(Err(anyhow::anyhow!("path is not set")), |path| {
-                        Ok(path.to_str().unwrap())
-                    })?;
+                let path = self.path.as_ref().map_or(
+                    Err(anyhow::anyhow!("type sqlite needs the path field")),
+                    |path| Ok(path.to_str().unwrap()),
+                )?;
 
                 Ok(format!("sqlite://{path}", path = path))
             }
diff --git a/src/log.rs b/src/log.rs
index eecf27c..0a2da10 100644
--- a/src/log.rs
+++ b/src/log.rs
@@ -1,14 +1,63 @@
+use serde::Deserialize;
+
+#[derive(Debug, PartialEq, PartialOrd, Eq, Ord, Clone, Deserialize)]
+pub enum LogLevel {
+    Quiet,
+    Error,
+    Info,
+}
+
+impl Default for LogLevel {
+    fn default() -> Self {
+        Self::Info
+    }
+}
+
+impl LogLevel {
+    pub fn is_writable(&self, level: &Self) -> bool {
+        use std::cmp::Ordering;
+        matches!(self.cmp(level), Ordering::Greater | Ordering::Equal)
+    }
+
+    pub fn write(&self, level: &Self) -> Box<dyn std::io::Write> {
+        if self.is_writable(level) {
+            match level {
+                Self::Error => Box::from(std::io::stderr()),
+                _ => Box::from(std::io::stdout()),
+            }
+        } else {
+            Box::from(std::io::sink())
+        }
+    }
+}
+
+impl From<LogLevel> for &'static str {
+    fn from(log_level: LogLevel) -> &'static str {
+        match log_level {
+            LogLevel::Quiet => "quiet",
+            LogLevel::Info => "info",
+            LogLevel::Error => "error",
+        }
+    }
+}
+
+impl std::str::FromStr for LogLevel {
+    type Err = String;
+
+    fn from_str(s: &str) -> Result<LogLevel, Self::Err> {
+        match s {
+            "quiet" => Ok(Self::Quiet),
+            "info" | "all" => Ok(Self::Info),
+            "error" => Ok(Self::Error),
+            level => Err(format!("I don't know the log level of {:?}", level)),
+        }
+    }
+}
+
 #[macro_export]
 macro_rules! outln {
-    ($($expr:expr),+) => {{
-        use std::io::{Write};
-        use std::fs::OpenOptions;
-        let mut file = OpenOptions::new()
-            .write(true)
-            .create(true)
-            .append(true)
-            .open("gobang.log")
-            .unwrap();
-        writeln!(file, $($expr),+).expect("Can't write output");
+    ($config:ident#$level:path, $($expr:expr),+) => {{
+        use $crate::log::LogLevel::*;
+        writeln!($config.log_level.write(&$level), $($expr),+).expect("Can't write output");
     }}
 }
diff --git a/src/main.rs b/src/main.rs
index 241f73d..8a1e718 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -22,8 +22,6 @@ use tui::{backend::CrosstermBackend, Terminal};
 
 #[tokio::main]
 async fn main() -> anyhow::Result<()> {
-    outln!("gobang logger");
-
     let value = crate::cli::parse();
     let config = config::Config::new(&value.config)?;
 
@@ -32,12 +30,17 @@ async fn main() -> anyhow::Result<()> {
     let backend = CrosstermBackend::new(io::stdout());
     let mut terminal = Terminal::new(backend)?;
     let events = event::Events::new(250);
-    let mut app = App::new(config);
+    let mut app = App::new(config.clone());
 
     terminal.clear()?;
 
     loop {
-        terminal.draw(|f| app.draw(f).unwrap())?;
+        terminal.draw(|f| {
+            if let Err(err) = app.draw(f) {
+                outln!(config#Error, "error: {}", err.to_string());
+                std::process::exit(1);
+            }
+        })?;
         match events.next()? {
             Event::Input(key) => match app.event(key).await {
                 Ok(state) => {