diff --git a/sdgb-api/src/all_net/mod.rs b/sdgb-api/src/all_net/mod.rs
index 76ed079..184fa56 100644
--- a/sdgb-api/src/all_net/mod.rs
+++ b/sdgb-api/src/all_net/mod.rs
@@ -4,12 +4,13 @@ use nyquest::{AsyncClient, Body, Request, header::USER_AGENT};
 
 mod model;
 use model::{GetResponse, GetUserId};
+use serde::Serialize;
 
 pub struct QRCode<'a> {
     pub qrcode_content: &'a str,
 }
 
-#[derive(Debug, snafu::Snafu)]
+#[derive(Debug, snafu::Snafu, Serialize)]
 pub enum QRLoginError {
     #[snafu(display("QRCode expired [10mins]"))]
     QRCodeExpired10,
@@ -23,13 +24,17 @@ pub enum QRLoginError {
     #[snafu(context(false))]
     #[snafu(display("request error: {source}"))]
     NyquestError {
+        #[serde(skip)]
         source: nyquest::Error,
+        #[serde(skip)]
         backtrace: Backtrace,
     },
 
     #[snafu(context(false))]
     JSONError {
+        #[serde(skip)]
         source: serde_json::error::Error,
+        #[serde(skip)]
         backtrace: Backtrace,
     },
 }
diff --git a/sdgb-api/src/helper/music_db/mod.rs b/sdgb-api/src/helper/music_db/mod.rs
index c21d5c5..b009c63 100644
--- a/sdgb-api/src/helper/music_db/mod.rs
+++ b/sdgb-api/src/helper/music_db/mod.rs
@@ -1,4 +1,4 @@
-use std::{fs::OpenOptions, sync::LazyLock};
+use std::{fs::OpenOptions, io::BufReader, sync::LazyLock, time::SystemTime};
 
 use rust_decimal::{Decimal, dec, serde::DecimalFromString};
 use rustc_hash::FxHashMap;
@@ -26,6 +26,7 @@ pub struct Level {
 type MusicDB = FxHashMap<u32, MusicInfo>;
 
 pub static MUSIC_DB: LazyLock<Option<MusicDB>> = LazyLock::new(|| {
+    let time = SystemTime::now();
     info!("loading musicDB...");
 
     let json = OpenOptions::new()
@@ -34,11 +35,17 @@ pub static MUSIC_DB: LazyLock<Option<MusicDB>> = LazyLock::new(|| {
         .open("musicDB.json")
         .inspect_err(|e| warn!("failed to load musicDB: {e}"))
         .ok()?;
+    let buf_reader = BufReader::new(json);
 
-    let db: Vec<MusicInfo> = serde_json::from_reader(json)
+    let db: Vec<MusicInfo> = serde_json::from_reader(buf_reader)
         .inspect_err(|e| warn!("failed to load musicDB: {e}"))
         .ok()?;
 
+    info!(
+        "loaded musicDB, cost {}ms",
+        time.elapsed().unwrap_or_default().as_millis()
+    );
+
     Some(db.into_iter().map(|entry| (entry.id, entry)).collect())
 });
 
diff --git a/sdgb-cli/src/main.rs b/sdgb-cli/src/main.rs
index 3cb8e22..c44a129 100644
--- a/sdgb-cli/src/main.rs
+++ b/sdgb-cli/src/main.rs
@@ -1,4 +1,7 @@
-use std::sync::atomic::{AtomicBool, Ordering};
+use std::{
+    io::stdout,
+    sync::atomic::{AtomicBool, Ordering},
+};
 
 use nyquest_preset::nyquest::ClientBuilder;
 use palc::Parser;
@@ -116,10 +119,17 @@ async fn main() -> Result<(), Box<dyn snafu::Error>> {
         }
         commands::Commands::QRLogin { ref qrcode_content } => {
             let qrcode = QRCode { qrcode_content };
-            match qrcode.login(&client).await {
+            let resp = qrcode.login(&client).await;
+
+            match &resp {
                 Ok(user_id) => info!("login succeed: {user_id}"),
                 Err(e) => error!("login failed: {e}"),
             }
+
+            if !human_readable {
+                let lock = stdout().lock();
+                serde_json::to_writer_pretty(lock, &resp)?;
+            }
         }
 
         commands::Commands::AuthLite { title_ver, variant } => {