diff --git a/src/client/commands/create_db.rs b/src/client/commands/create_db.rs
index 53407af..b88044a 100644
--- a/src/client/commands/create_db.rs
+++ b/src/client/commands/create_db.rs
@@ -4,9 +4,12 @@ use tokio_stream::StreamExt;
 
 use crate::{
     client::commands::erroneous_server_response,
-    core::protocol::{
-        ClientToServerMessageStream, MySQLDatabase, Request, Response,
-        print_create_databases_output_status, print_create_databases_output_status_json,
+    core::{
+        protocol::{
+            ClientToServerMessageStream, Request, Response, print_create_databases_output_status,
+            print_create_databases_output_status_json,
+        },
+        types::MySQLDatabase,
     },
 };
 
diff --git a/src/client/commands/create_user.rs b/src/client/commands/create_user.rs
index ea2ceca..84d7a38 100644
--- a/src/client/commands/create_user.rs
+++ b/src/client/commands/create_user.rs
@@ -5,10 +5,12 @@ use tokio_stream::StreamExt;
 
 use crate::{
     client::commands::{erroneous_server_response, read_password_from_stdin_with_double_check},
-    core::protocol::{
-        ClientToServerMessageStream, MySQLUser, Request, Response,
-        print_create_users_output_status, print_create_users_output_status_json,
-        print_set_password_output_status,
+    core::{
+        protocol::{
+            ClientToServerMessageStream, Request, Response, print_create_users_output_status,
+            print_create_users_output_status_json, print_set_password_output_status,
+        },
+        types::MySQLUser,
     },
 };
 
diff --git a/src/client/commands/drop_db.rs b/src/client/commands/drop_db.rs
index e9c1aec..f9a929f 100644
--- a/src/client/commands/drop_db.rs
+++ b/src/client/commands/drop_db.rs
@@ -4,9 +4,12 @@ use tokio_stream::StreamExt;
 
 use crate::{
     client::commands::erroneous_server_response,
-    core::protocol::{
-        ClientToServerMessageStream, MySQLDatabase, Request, Response,
-        print_drop_databases_output_status, print_drop_databases_output_status_json,
+    core::{
+        protocol::{
+            ClientToServerMessageStream, Request, Response, print_drop_databases_output_status,
+            print_drop_databases_output_status_json,
+        },
+        types::MySQLDatabase,
     },
 };
 
diff --git a/src/client/commands/drop_user.rs b/src/client/commands/drop_user.rs
index 2cfeeab..745b9ef 100644
--- a/src/client/commands/drop_user.rs
+++ b/src/client/commands/drop_user.rs
@@ -4,9 +4,12 @@ use tokio_stream::StreamExt;
 
 use crate::{
     client::commands::erroneous_server_response,
-    core::protocol::{
-        ClientToServerMessageStream, MySQLUser, Request, Response, print_drop_users_output_status,
-        print_drop_users_output_status_json,
+    core::{
+        protocol::{
+            ClientToServerMessageStream, Request, Response, print_drop_users_output_status,
+            print_drop_users_output_status_json,
+        },
+        types::MySQLUser,
     },
 };
 
diff --git a/src/client/commands/edit_db_privs.rs b/src/client/commands/edit_db_privs.rs
index cc1f668..3864c07 100644
--- a/src/client/commands/edit_db_privs.rs
+++ b/src/client/commands/edit_db_privs.rs
@@ -17,9 +17,10 @@ use crate::{
             parse_privilege_data_from_editor_content, reduce_privilege_diffs,
         },
         protocol::{
-            ClientToServerMessageStream, MySQLDatabase, Request, Response,
+            ClientToServerMessageStream, Request, Response,
             print_modify_database_privileges_output_status,
         },
+        types::MySQLDatabase,
     },
 };
 
diff --git a/src/client/commands/lock_user.rs b/src/client/commands/lock_user.rs
index 334c950..86258af 100644
--- a/src/client/commands/lock_user.rs
+++ b/src/client/commands/lock_user.rs
@@ -4,9 +4,12 @@ use tokio_stream::StreamExt;
 
 use crate::{
     client::commands::erroneous_server_response,
-    core::protocol::{
-        ClientToServerMessageStream, MySQLUser, Request, Response, print_lock_users_output_status,
-        print_lock_users_output_status_json,
+    core::{
+        protocol::{
+            ClientToServerMessageStream, Request, Response, print_lock_users_output_status,
+            print_lock_users_output_status_json,
+        },
+        types::MySQLUser,
     },
 };
 
diff --git a/src/client/commands/passwd_user.rs b/src/client/commands/passwd_user.rs
index 307cc8c..45a532b 100644
--- a/src/client/commands/passwd_user.rs
+++ b/src/client/commands/passwd_user.rs
@@ -6,9 +6,12 @@ use tokio_stream::StreamExt;
 
 use crate::{
     client::commands::erroneous_server_response,
-    core::protocol::{
-        ClientToServerMessageStream, ListUsersError, MySQLUser, Request, Response,
-        print_set_password_output_status,
+    core::{
+        protocol::{
+            ClientToServerMessageStream, ListUsersError, Request, Response,
+            print_set_password_output_status,
+        },
+        types::MySQLUser,
     },
 };
 
diff --git a/src/client/commands/show_db.rs b/src/client/commands/show_db.rs
index d1590bf..0b80a9a 100644
--- a/src/client/commands/show_db.rs
+++ b/src/client/commands/show_db.rs
@@ -5,7 +5,10 @@ use tokio_stream::StreamExt;
 
 use crate::{
     client::commands::erroneous_server_response,
-    core::protocol::{ClientToServerMessageStream, MySQLDatabase, Request, Response},
+    core::{
+        protocol::{ClientToServerMessageStream, Request, Response},
+        types::MySQLDatabase,
+    },
 };
 
 #[derive(Parser, Debug, Clone)]
diff --git a/src/client/commands/show_db_privs.rs b/src/client/commands/show_db_privs.rs
index e2d172b..ad90691 100644
--- a/src/client/commands/show_db_privs.rs
+++ b/src/client/commands/show_db_privs.rs
@@ -8,7 +8,8 @@ use crate::{
     core::{
         common::yn,
         database_privileges::{DATABASE_PRIVILEGE_FIELDS, db_priv_field_human_readable_name},
-        protocol::{ClientToServerMessageStream, MySQLDatabase, Request, Response},
+        protocol::{ClientToServerMessageStream, Request, Response},
+        types::MySQLDatabase,
     },
 };
 
diff --git a/src/client/commands/show_user.rs b/src/client/commands/show_user.rs
index a215cb4..a413c79 100644
--- a/src/client/commands/show_user.rs
+++ b/src/client/commands/show_user.rs
@@ -5,7 +5,10 @@ use tokio_stream::StreamExt;
 
 use crate::{
     client::commands::erroneous_server_response,
-    core::protocol::{ClientToServerMessageStream, MySQLUser, Request, Response},
+    core::{
+        protocol::{ClientToServerMessageStream, Request, Response},
+        types::MySQLUser,
+    },
 };
 
 #[derive(Parser, Debug, Clone)]
diff --git a/src/client/commands/unlock_user.rs b/src/client/commands/unlock_user.rs
index 58021c0..d280a6f 100644
--- a/src/client/commands/unlock_user.rs
+++ b/src/client/commands/unlock_user.rs
@@ -4,9 +4,12 @@ use tokio_stream::StreamExt;
 
 use crate::{
     client::commands::erroneous_server_response,
-    core::protocol::{
-        ClientToServerMessageStream, MySQLUser, Request, Response,
-        print_unlock_users_output_status, print_unlock_users_output_status_json,
+    core::{
+        protocol::{
+            ClientToServerMessageStream, Request, Response, print_unlock_users_output_status,
+            print_unlock_users_output_status_json,
+        },
+        types::MySQLUser,
     },
 };
 
diff --git a/src/client/mysql_admutils_compatibility/common.rs b/src/client/mysql_admutils_compatibility/common.rs
index d3d829d..5a293b5 100644
--- a/src/client/mysql_admutils_compatibility/common.rs
+++ b/src/client/mysql_admutils_compatibility/common.rs
@@ -1,4 +1,4 @@
-use crate::core::protocol::{MySQLDatabase, MySQLUser};
+use crate::core::types::{MySQLDatabase, MySQLUser};
 
 #[inline]
 pub fn trim_db_name_to_32_chars(db_name: &MySQLDatabase) -> MySQLDatabase {
diff --git a/src/client/mysql_admutils_compatibility/mysql_dbadm.rs b/src/client/mysql_admutils_compatibility/mysql_dbadm.rs
index 10ed8fa..d19b77c 100644
--- a/src/client/mysql_admutils_compatibility/mysql_dbadm.rs
+++ b/src/client/mysql_admutils_compatibility/mysql_dbadm.rs
@@ -19,9 +19,10 @@ use crate::{
         bootstrap::bootstrap_server_connection_and_drop_privileges,
         database_privileges::DatabasePrivilegeRow,
         protocol::{
-            ClientToServerMessageStream, GetDatabasesPrivilegeDataError, MySQLDatabase, Request,
-            Response, create_client_to_server_message_stream,
+            ClientToServerMessageStream, GetDatabasesPrivilegeDataError, Request, Response,
+            create_client_to_server_message_stream,
         },
+        types::MySQLDatabase,
     },
 };
 
diff --git a/src/client/mysql_admutils_compatibility/mysql_useradm.rs b/src/client/mysql_admutils_compatibility/mysql_useradm.rs
index 72e1b6a..ac19fe3 100644
--- a/src/client/mysql_admutils_compatibility/mysql_useradm.rs
+++ b/src/client/mysql_admutils_compatibility/mysql_useradm.rs
@@ -18,9 +18,9 @@ use crate::{
     core::{
         bootstrap::bootstrap_server_connection_and_drop_privileges,
         protocol::{
-            ClientToServerMessageStream, MySQLUser, Request, Response,
-            create_client_to_server_message_stream,
+            ClientToServerMessageStream, Request, Response, create_client_to_server_message_stream,
         },
+        types::MySQLUser,
     },
     server::sql::user_operations::DatabaseUser,
 };
diff --git a/src/core.rs b/src/core.rs
index 565d038..5ef5054 100644
--- a/src/core.rs
+++ b/src/core.rs
@@ -2,3 +2,4 @@ pub mod bootstrap;
 pub mod common;
 pub mod database_privileges;
 pub mod protocol;
+pub mod types;
diff --git a/src/core/database_privileges/base.rs b/src/core/database_privileges/base.rs
index ebea5c5..b2f2639 100644
--- a/src/core/database_privileges/base.rs
+++ b/src/core/database_privileges/base.rs
@@ -3,7 +3,7 @@
 
 use std::fmt;
 
-use crate::core::protocol::{MySQLDatabase, MySQLUser};
+use crate::core::types::{MySQLDatabase, MySQLUser};
 use serde::{Deserialize, Serialize};
 
 /// This is the list of fields that are used to fetch the db + user + privileges
diff --git a/src/core/database_privileges/cli.rs b/src/core/database_privileges/cli.rs
index ed30101..d045899 100644
--- a/src/core/database_privileges/cli.rs
+++ b/src/core/database_privileges/cli.rs
@@ -2,7 +2,7 @@
 //! database privileges related CLI commands.
 
 use super::diff::{DatabasePrivilegeChange, DatabasePrivilegeRowDiff};
-use crate::core::protocol::{MySQLDatabase, MySQLUser};
+use crate::core::types::{MySQLDatabase, MySQLUser};
 
 /// This enum represents a part of a CLI argument for editing database privileges,
 /// indicating whether privileges are to be added, set, or removed.
diff --git a/src/core/database_privileges/diff.rs b/src/core/database_privileges/diff.rs
index 3edef4d..e5c6c7b 100644
--- a/src/core/database_privileges/diff.rs
+++ b/src/core/database_privileges/diff.rs
@@ -2,7 +2,7 @@
 //! generating, validating and reducing diffs between two sets of database privileges.
 
 use super::base::{DatabasePrivilegeRow, db_priv_field_human_readable_name};
-use crate::core::protocol::{MySQLDatabase, MySQLUser};
+use crate::core::types::{MySQLDatabase, MySQLUser};
 use prettytable::Table;
 use serde::{Deserialize, Serialize};
 use std::{
diff --git a/src/core/database_privileges/editor.rs b/src/core/database_privileges/editor.rs
index 62cf8c3..c817c23 100644
--- a/src/core/database_privileges/editor.rs
+++ b/src/core/database_privileges/editor.rs
@@ -6,7 +6,7 @@ use super::base::{
 };
 use crate::core::{
     common::{rev_yn, yn},
-    protocol::MySQLDatabase,
+    types::MySQLDatabase,
 };
 use anyhow::{Context, anyhow};
 use itertools::Itertools;
diff --git a/src/core/protocol/request_response.rs b/src/core/protocol/request_response.rs
index 49b5c19..a0e831e 100644
--- a/src/core/protocol/request_response.rs
+++ b/src/core/protocol/request_response.rs
@@ -1,16 +1,15 @@
-use std::{
-    collections::BTreeSet,
-    fmt::{Display, Formatter},
-    ops::{Deref, DerefMut},
-    str::FromStr,
-};
+use std::collections::BTreeSet;
 
 use serde::{Deserialize, Serialize};
 use tokio::net::UnixStream;
 use tokio_serde::{Framed as SerdeFramed, formats::Bincode};
 use tokio_util::codec::{Framed, LengthDelimitedCodec};
 
-use crate::core::{database_privileges::DatabasePrivilegesDiff, protocol::*};
+use crate::core::{
+    database_privileges::DatabasePrivilegesDiff,
+    protocol::*,
+    types::{MySQLDatabase, MySQLUser},
+};
 
 pub type ServerToClientMessageStream = SerdeFramed<
     Framed<UnixStream, LengthDelimitedCodec>,
@@ -36,92 +35,6 @@ pub fn create_client_to_server_message_stream(socket: UnixStream) -> ClientToSer
     tokio_serde::Framed::new(length_delimited, Bincode::default())
 }
 
-#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize, Default)]
-pub struct MySQLUser(String);
-
-impl FromStr for MySQLUser {
-    type Err = String;
-
-    fn from_str(s: &str) -> Result<Self, Self::Err> {
-        Ok(MySQLUser(s.to_string()))
-    }
-}
-
-impl Deref for MySQLUser {
-    type Target = String;
-
-    fn deref(&self) -> &Self::Target {
-        &self.0
-    }
-}
-
-impl DerefMut for MySQLUser {
-    fn deref_mut(&mut self) -> &mut Self::Target {
-        &mut self.0
-    }
-}
-
-impl Display for MySQLUser {
-    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
-        write!(f, "{}", self.0)
-    }
-}
-
-impl From<&str> for MySQLUser {
-    fn from(s: &str) -> Self {
-        MySQLUser(s.to_string())
-    }
-}
-
-impl From<String> for MySQLUser {
-    fn from(s: String) -> Self {
-        MySQLUser(s)
-    }
-}
-
-#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize, Default)]
-pub struct MySQLDatabase(String);
-
-impl FromStr for MySQLDatabase {
-    type Err = String;
-
-    fn from_str(s: &str) -> Result<Self, Self::Err> {
-        Ok(MySQLDatabase(s.to_string()))
-    }
-}
-
-impl Deref for MySQLDatabase {
-    type Target = String;
-
-    fn deref(&self) -> &Self::Target {
-        &self.0
-    }
-}
-
-impl DerefMut for MySQLDatabase {
-    fn deref_mut(&mut self) -> &mut Self::Target {
-        &mut self.0
-    }
-}
-
-impl Display for MySQLDatabase {
-    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
-        write!(f, "{}", self.0)
-    }
-}
-
-impl From<&str> for MySQLDatabase {
-    fn from(s: &str) -> Self {
-        MySQLDatabase(s.to_string())
-    }
-}
-
-impl From<String> for MySQLDatabase {
-    fn from(s: String) -> Self {
-        MySQLDatabase(s)
-    }
-}
-
 #[non_exhaustive]
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
 pub enum Request {
diff --git a/src/core/protocol/server_responses.rs b/src/core/protocol/server_responses.rs
index 3cdd666..553a097 100644
--- a/src/core/protocol/server_responses.rs
+++ b/src/core/protocol/server_responses.rs
@@ -9,12 +9,11 @@ use crate::{
     core::{
         common::UnixUser,
         database_privileges::{DatabasePrivilegeRow, DatabasePrivilegeRowDiff},
+        types::{MySQLDatabase, MySQLUser},
     },
     server::sql::{database_operations::DatabaseRow, user_operations::DatabaseUser},
 };
 
-use super::{MySQLDatabase, MySQLUser};
-
 /// This enum is used to differentiate between database and user operations.
 /// Their output are very similar, but there are slight differences in the words used.
 #[derive(Debug, PartialEq, Eq, Clone, Copy)]
diff --git a/src/core/types.rs b/src/core/types.rs
new file mode 100644
index 0000000..1c0354a
--- /dev/null
+++ b/src/core/types.rs
@@ -0,0 +1,93 @@
+use std::{
+    fmt,
+    ops::{Deref, DerefMut},
+    str::FromStr,
+};
+
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize, Default)]
+pub struct MySQLUser(String);
+
+impl FromStr for MySQLUser {
+    type Err = String;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        Ok(MySQLUser(s.to_string()))
+    }
+}
+
+impl Deref for MySQLUser {
+    type Target = String;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl DerefMut for MySQLUser {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.0
+    }
+}
+
+impl fmt::Display for MySQLUser {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}", self.0)
+    }
+}
+
+impl From<&str> for MySQLUser {
+    fn from(s: &str) -> Self {
+        MySQLUser(s.to_string())
+    }
+}
+
+impl From<String> for MySQLUser {
+    fn from(s: String) -> Self {
+        MySQLUser(s)
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Serialize, Deserialize, Default)]
+pub struct MySQLDatabase(String);
+
+impl FromStr for MySQLDatabase {
+    type Err = String;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        Ok(MySQLDatabase(s.to_string()))
+    }
+}
+
+impl Deref for MySQLDatabase {
+    type Target = String;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl DerefMut for MySQLDatabase {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.0
+    }
+}
+
+impl fmt::Display for MySQLDatabase {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}", self.0)
+    }
+}
+
+impl From<&str> for MySQLDatabase {
+    fn from(s: &str) -> Self {
+        MySQLDatabase(s.to_string())
+    }
+}
+
+impl From<String> for MySQLDatabase {
+    fn from(s: String) -> Self {
+        MySQLDatabase(s)
+    }
+}
diff --git a/src/server/sql/database_operations.rs b/src/server/sql/database_operations.rs
index d47a44e..64da8cc 100644
--- a/src/server/sql/database_operations.rs
+++ b/src/server/sql/database_operations.rs
@@ -5,7 +5,7 @@ use sqlx::prelude::*;
 
 use serde::{Deserialize, Serialize};
 
-use crate::core::protocol::MySQLDatabase;
+use crate::core::types::MySQLDatabase;
 use crate::{
     core::{
         common::UnixUser,
diff --git a/src/server/sql/database_privilege_operations.rs b/src/server/sql/database_privilege_operations.rs
index 957e643..5eecc2e 100644
--- a/src/server/sql/database_privilege_operations.rs
+++ b/src/server/sql/database_privilege_operations.rs
@@ -30,9 +30,9 @@ use crate::{
         protocol::{
             DiffDoesNotApplyError, GetAllDatabasesPrivilegeData, GetAllDatabasesPrivilegeDataError,
             GetDatabasesPrivilegeData, GetDatabasesPrivilegeDataError,
-            ModifyDatabasePrivilegesError, ModifyDatabasePrivilegesOutput, MySQLDatabase,
-            MySQLUser,
+            ModifyDatabasePrivilegesError, ModifyDatabasePrivilegesOutput,
         },
+        types::{MySQLDatabase, MySQLUser},
     },
     server::{
         common::{create_user_group_matching_regex, try_get_with_binary_fallback},
diff --git a/src/server/sql/user_operations.rs b/src/server/sql/user_operations.rs
index 5c6047e..bbb71e4 100644
--- a/src/server/sql/user_operations.rs
+++ b/src/server/sql/user_operations.rs
@@ -14,8 +14,9 @@ use crate::{
         protocol::{
             CreateUserError, CreateUsersOutput, DropUserError, DropUsersOutput, ListAllUsersError,
             ListAllUsersOutput, ListUsersError, ListUsersOutput, LockUserError, LockUsersOutput,
-            MySQLUser, SetPasswordError, SetPasswordOutput, UnlockUserError, UnlockUsersOutput,
+            SetPasswordError, SetPasswordOutput, UnlockUserError, UnlockUsersOutput,
         },
+        types::MySQLUser,
     },
     server::{
         common::{create_user_group_matching_regex, try_get_with_binary_fallback},