diff --git a/src/api/auth/utils.rs b/src/api/auth/utils.rs
index 68ecc5f..0f31d0a 100644
--- a/src/api/auth/utils.rs
+++ b/src/api/auth/utils.rs
@@ -71,7 +71,7 @@ pub async fn get_user_by_username_and_password(
     password: &str,
 ) -> ApiResult<UserModel> {
     if username.is_empty() || password.is_empty() {
-        return Err(ApiError::BAdRequest(
+        return Err(ApiError::BadRequest(
             "Invalid username or password, must be not empty".to_owned(),
         ));
     }
diff --git a/src/api/todo/utils.rs b/src/api/todo/utils.rs
index 6fd2cb4..aa30be9 100644
--- a/src/api/todo/utils.rs
+++ b/src/api/todo/utils.rs
@@ -110,14 +110,14 @@ pub async fn update_todo(
 ) -> ApiResult<TodoModel> {
     if let Some(title) = &title {
         if title.is_empty() {
-            return Err(ApiError::BAdRequest("The todo title is empty".to_string()));
+            return Err(ApiError::BadRequest("The todo title is empty".to_string()));
         } else if is_todo_title_exists(title, todo.user_id, db).await? {
-            return Err(ApiError::BAdRequest(format!(
+            return Err(ApiError::BadRequest(format!(
                 "The todo `{}` is already exists",
                 title
             )));
         } else if title.chars().count() > max_todo_title_length() as usize {
-            return Err(ApiError::BAdRequest(format!(
+            return Err(ApiError::BadRequest(format!(
                 "The todo title length must be less than {}",
                 max_todo_title_length()
             )));
@@ -141,14 +141,14 @@ pub async fn create_todo(
     user_id: u32,
 ) -> ApiResult<TodoSchema> {
     if todo_content.title.is_empty() {
-        return Err(ApiError::BAdRequest("The todo title is empty".to_string()));
+        return Err(ApiError::BadRequest("The todo title is empty".to_string()));
     } else if is_todo_title_exists(&todo_content.title, user_id, db).await? {
-        return Err(ApiError::BAdRequest(format!(
+        return Err(ApiError::BadRequest(format!(
             "The todo `{}` is already exists",
             todo_content.title
         )));
     } else if todo_content.title.chars().count() > max_todo_title_length() as usize {
-        return Err(ApiError::BAdRequest(format!(
+        return Err(ApiError::BadRequest(format!(
             "The todo title length must be less than {}",
             max_todo_title_length()
         )));
@@ -159,7 +159,7 @@ pub async fn create_todo(
         .database_err()?
         > max_todos_count()
     {
-        return Err(ApiError::BAdRequest(format!(
+        return Err(ApiError::BadRequest(format!(
             "The maximum number of todos is {}",
             max_todos_count()
         )));
diff --git a/src/errors.rs b/src/errors.rs
index f27f045..eedb833 100644
--- a/src/errors.rs
+++ b/src/errors.rs
@@ -12,7 +12,7 @@ pub enum Error {
     #[error("{0}")]
     InternalServer(String),
     #[error("{0}")]
-    BAdRequest(String),
+    BadRequest(String),
     #[error("{0}")]
     NotFound(String),
     #[error("{0}")]
@@ -46,7 +46,7 @@ impl<T, E> ErrorTrait for std::result::Result<T, E> {
     }
 
     fn bad_request_err(self, message: &str) -> Self::Output {
-        self.map_err(|_| Error::BAdRequest(message.to_string()))
+        self.map_err(|_| Error::BadRequest(message.to_string()))
     }
 
     fn not_found_err(self, message: &str) -> Self::Output {
@@ -121,8 +121,8 @@ impl<T> ErrorTrait for Option<T> {
 impl From<QueryPayloadError> for Error {
     fn from(err: QueryPayloadError) -> Self {
         match err {
-            QueryPayloadError::Deserialize(err) => Self::BAdRequest(err.to_string()),
-            _ => Self::BAdRequest("The parameters query are invalid".to_string()),
+            QueryPayloadError::Deserialize(err) => Self::BadRequest(err.to_string()),
+            _ => Self::BadRequest("The parameters query are invalid".to_string()),
         }
     }
 }
@@ -131,12 +131,12 @@ impl From<JsonPayloadError> for Error {
     fn from(err: JsonPayloadError) -> Self {
         match err {
             JsonPayloadError::ContentType => {
-                Self::BAdRequest("The content type is not `application/json`".to_string())
+                Self::BadRequest("The content type is not `application/json`".to_string())
             }
             JsonPayloadError::Deserialize(err) => {
-                Self::BAdRequest(format!("The request body is invalid: {err}"))
+                Self::BadRequest(format!("The request body is invalid: {err}"))
             }
-            _ => Self::BAdRequest("The request body is invalid".to_string()),
+            _ => Self::BadRequest("The request body is invalid".to_string()),
         }
     }
 }
@@ -145,7 +145,7 @@ impl ResponseError for Error {
     fn status_code(&self) -> StatusCode {
         match self {
             Self::InternalServer(_) => StatusCode::INTERNAL_SERVER_ERROR,
-            Self::BAdRequest(_) => StatusCode::BAD_REQUEST,
+            Self::BadRequest(_) => StatusCode::BAD_REQUEST,
             Self::NotFound(_) => StatusCode::NOT_FOUND,
             Self::Forbidden(_) => StatusCode::FORBIDDEN,
             Self::Unauthorized(_) => StatusCode::UNAUTHORIZED,
diff --git a/src/schemas/auth/register.rs b/src/schemas/auth/register.rs
index ef37bca..4c1bf75 100644
--- a/src/schemas/auth/register.rs
+++ b/src/schemas/auth/register.rs
@@ -25,7 +25,7 @@ pub struct RegisterSchema {
 impl RegisterSchema {
     pub async fn create(&self, db: &DatabaseConnection) -> ApiResult<UserSchema> {
         if self.username.is_empty() || self.password.is_empty() {
-            return Err(ApiError::BAdRequest(
+            return Err(ApiError::BadRequest(
                 "Invalid username or password, must be not empty".to_owned(),
             ));
         }
@@ -45,7 +45,7 @@ impl RegisterSchema {
         .map_err(|db_err| {
             if let DbErr::Exec(RuntimeErr::SqlxError(SqlxError::Database(e))) = db_err {
                 if e.code() == Some(Cow::Borrowed("2067")) {
-                    return ApiError::BAdRequest(format!(
+                    return ApiError::BadRequest(format!(
                         "Username {} already exists",
                         self.username
                     ));