diff --git a/server/src/auth/login.rs b/server/src/auth/login.rs
index f745f2e..c57cd77 100644
--- a/server/src/auth/login.rs
+++ b/server/src/auth/login.rs
@@ -25,8 +25,7 @@ pub async fn handle(
             // create user token
             let token = create_token(&user, config.jwt.secret.as_bytes(), config.jwt.expires)?;
 
-            // Reponse user token
-            Response::LoggedIn {
+            Response {
                 access_token: token,
             }
         },
diff --git a/server/src/auth/register.rs b/server/src/auth/register.rs
index c75b6c9..ebec0ff 100644
--- a/server/src/auth/register.rs
+++ b/server/src/auth/register.rs
@@ -41,7 +41,7 @@ pub async fn handle(
         Ok(_result) => {
             let token = create_token(&user, config.jwt.secret.as_bytes(), config.jwt.expires)?;
 
-            Response::LoggedIn {
+            Response {
                 access_token: token,
             }
         },
diff --git a/server/src/fs/delete.rs b/server/src/fs/delete.rs
index e8f1815..d1d8365 100644
--- a/server/src/fs/delete.rs
+++ b/server/src/fs/delete.rs
@@ -47,7 +47,6 @@ pub async fn handle(
     // delete directory
     else if path.is_dir() {
         fs::remove_dir(&path)
-            // return error
             .map_err(|err| ServerError::FsError(FsError::DeleteDirectory(err.to_string())))?;
     }
 
diff --git a/server/src/fs/list.rs b/server/src/fs/list.rs
index b9a91ee..38c2e76 100644
--- a/server/src/fs/list.rs
+++ b/server/src/fs/list.rs
@@ -1,4 +1,4 @@
-use std::{fs, io, path::PathBuf};
+use std::{fs, io, path::PathBuf, time::SystemTime};
 
 use axum::{extract::rejection::JsonRejection, Extension, Json};
 use axum_auth::AuthBearer;
@@ -91,26 +91,13 @@ pub async fn handle(
                 .get_appropriate_unit(true)
                 .to_string();
 
-            // check how long it has been since the file was last modified
-            let elapsed = metadata.modified().unwrap().elapsed().unwrap();
-
-            let seconds = elapsed.as_secs();
-            let minutes = seconds / 60;
-            let hours = minutes / 60;
-            let days = hours / 24;
-
-            let modified;
-
-            // format elapsed time
-            if days > 1 {
-                modified = format!("{} day(s)", days)
-            } else if hours > 1 {
-                modified = format!("{} hour(s)", hours)
-            } else if minutes > 1 {
-                modified = format!("{} minute(s)", minutes)
-            } else {
-                modified = format!("{} second(s)", seconds)
-            }
+            // get modification time in unix time format
+            let modified = metadata
+                .modified()
+                .unwrap()
+                .duration_since(SystemTime::UNIX_EPOCH)
+                .unwrap()
+                .as_secs();
 
             files.push(FileInfo {
                 name,
diff --git a/server/src/fs/upload.rs b/server/src/fs/upload.rs
index 4a189a8..16842e5 100644
--- a/server/src/fs/upload.rs
+++ b/server/src/fs/upload.rs
@@ -63,10 +63,11 @@ pub async fn handle(
     let file = std::fs::File::create(&file_path)
         .map_err(|err| ServerError::FsError(FsError::CreateFile(err.to_string())))?;
 
-    // write file
+    // write file (chunk by chunk)
     field
         .try_fold((file, 0u64), |(mut file, written_len), bytes| async move {
-            file.write_all(bytes.as_ref()).expect("write file error");
+            file.write_all(bytes.as_ref())
+                .expect("failed to write chunk to file");
 
             Ok((file, written_len + bytes.len() as u64))
         })
diff --git a/server/src/middleware/validate_json.rs b/server/src/middleware/validate_json.rs
index 08368ca..05530d4 100644
--- a/server/src/middleware/validate_json.rs
+++ b/server/src/middleware/validate_json.rs
@@ -7,7 +7,7 @@ pub fn validate_json<T>(payload: Result<Json<T>, JsonRejection>) -> Result<Json<
         // if success return payload
         Ok(payload) => Ok(payload),
         // mission json in Content-Type Header
-        Err(JsonRejection::MissingJsonContentType(_)) => Err(ServerError::MissingJsonContentType),
+        Err(JsonRejection::MissingJsonContentType(_)) => Err(ServerError::InvalidContentType),
         // failed to deserialize json
         Err(JsonRejection::JsonDataError(_)) => Err(ServerError::JsonDataError),
         // syntax error in json
diff --git a/types/src/auth/login.rs b/types/src/auth/login.rs
index d1b96e6..bf30f7b 100644
--- a/types/src/auth/login.rs
+++ b/types/src/auth/login.rs
@@ -5,17 +5,12 @@ use serde::{Deserialize, Serialize};
 /// HTTP `/auth/login` Request
 #[derive(Debug, Serialize, Deserialize, Clone)]
 pub struct Request {
-    /// Username
     pub username: String,
-    /// Unencrypted user password
     pub password: String,
 }
 
 /// HTTP `/auth/login` Response
 #[derive(Debug, Serialize, Deserialize, Clone)]
-pub enum Response {
-    LoggedIn {
-        /// User access token
-        access_token: String,
-    },
+pub struct Response {
+    pub access_token: String,
 }
diff --git a/types/src/errors/server.rs b/types/src/errors/server.rs
index f2f982f..f4afb74 100644
--- a/types/src/errors/server.rs
+++ b/types/src/errors/server.rs
@@ -13,8 +13,8 @@ pub enum Error {
     FsError(#[from] FsError),
     #[error("too may requests, please slow down")]
     TooManyRequests,
-    #[error("missing json in Content-Type header")]
-    MissingJsonContentType,
+    #[error("invalid Content-Type")]
+    InvalidContentType,
     #[error("failed to deserialize json")]
     JsonDataError,
     #[error("syntax error in json")]
diff --git a/types/src/fs/list.rs b/types/src/fs/list.rs
index ef5cf41..f4b392e 100644
--- a/types/src/fs/list.rs
+++ b/types/src/fs/list.rs
@@ -26,7 +26,7 @@ pub struct FileInfo {
     /// File size
     pub size: String,
     /// Latest modification of this file
-    pub modified: String,
+    pub modified: u64,
 }
 
 /// Info about a directory