diff --git a/src/command/config.rs b/src/command/config.rs
index fdd2d21..506089a 100644
--- a/src/command/config.rs
+++ b/src/command/config.rs
@@ -22,9 +22,9 @@ pub(crate) enum ConfigVersion {
 #[derive(thiserror::Error, Debug)]
 pub(crate) enum Error {
     #[error(transparent)]
-    Migrate(#[from] migrate::ConfigMigrateError),
+    Migrate(#[from] migrate::MigrationError),
     #[error(transparent)]
-    Validate(#[from] validate::ConfigValidateError),
+    Validate(#[from] validate::ValidationError),
 }
 
 pub(crate) async fn run(command: Commands) -> Result<(), Error> {
diff --git a/src/command/config/migrate.rs b/src/command/config/migrate.rs
index e72402d..c544835 100644
--- a/src/command/config/migrate.rs
+++ b/src/command/config/migrate.rs
@@ -5,12 +5,12 @@ mod v20240701;
 use super::ConfigVersion;
 
 #[derive(thiserror::Error, Debug)]
-pub(crate) enum ConfigMigrateError {
+pub(crate) enum MigrationError {
     #[error(transparent)]
     V20240701(#[from] v20240701::Error),
 }
 
-pub(super) async fn run(version: ConfigVersion) -> Result<(), ConfigMigrateError> {
+pub(super) async fn run(version: ConfigVersion) -> Result<(), MigrationError> {
     match version {
         ConfigVersion::V20240701 => v20240701::run().await?,
     }
diff --git a/src/command/config/migrate/v20240701.rs b/src/command/config/migrate/v20240701.rs
index a14efbb..cb1b2ae 100644
--- a/src/command/config/migrate/v20240701.rs
+++ b/src/command/config/migrate/v20240701.rs
@@ -394,7 +394,7 @@ fn create_new_client_config(meta: Meta) -> Result<client::Config, Error> {
     let mut config = client::Config {
         theme: None,
         image: None,
-        pinned_links: vec![],
+        pinned_links: None,
     };
 
     if meta.theme_color.is_some()
@@ -438,7 +438,7 @@ pub(super) async fn run() -> Result<(), Error> {
     }
 
     let mut server_toml =
-        fs::File::create_new("config/server.toml").map_err(WriteTomlConfigError::ServerWrite)?;
+        fs::File::create("config/server.toml").map_err(WriteTomlConfigError::ServerWrite)?;
     server_toml
         .write(
             toml::to_string_pretty(&server_config)
@@ -446,10 +446,10 @@ pub(super) async fn run() -> Result<(), Error> {
                 .as_bytes(),
         )
         .map_err(WriteTomlConfigError::ServerWrite)?;
-    cprintln!("<g>config/server.toml</> has been created!");
+    cprintln!("<g!><bold>config/server.toml</></> has been created!");
 
     let mut client_toml =
-        fs::File::create_new("config/client.toml").map_err(WriteTomlConfigError::ClientWrite)?;
+        fs::File::create("config/client.toml").map_err(WriteTomlConfigError::ClientWrite)?;
     client_toml
         .write(
             toml::to_string_pretty(&client_config)
@@ -457,7 +457,7 @@ pub(super) async fn run() -> Result<(), Error> {
                 .as_bytes(),
         )
         .map_err(WriteTomlConfigError::ClientWrite)?;
-    cprintln!("<g>config/client.toml</> has been created!");
+    cprintln!("<g><bold>config/client.toml</></> has been created!");
 
     Ok(())
 }
diff --git a/src/command/config/validate.rs b/src/command/config/validate.rs
index b809be7..c7d1edb 100644
--- a/src/command/config/validate.rs
+++ b/src/command/config/validate.rs
@@ -1,47 +1,73 @@
 //! `config validate` subcommand
 
 use crate::config::{client, server};
+use color_print::cprintln;
 use std::{fs, io::Read};
-use validator::{Validate, ValidationErrors};
+use validator::Validate;
 
 #[derive(thiserror::Error, Debug)]
-pub(crate) enum ConfigValidateError {
-    #[error(transparent)]
-    Read(#[from] ReadConfigError),
-    #[error(transparent)]
-    InvalidConfig(#[from] ValidationErrors),
-}
-
-#[derive(thiserror::Error, Debug)]
-pub(crate) enum ReadConfigError {
+pub(crate) enum ValidationError {
     #[error(transparent)]
     ReadFile(#[from] std::io::Error),
-    #[error("config/server.toml is not written in the TOML format")]
-    InvalidServerTomlFormat(#[source] toml::de::Error),
-    #[error("config/client.toml is not written in the TOML format")]
-    InvalidClientTomlFormat(#[source] toml::de::Error),
+    #[error("invalid config file")]
+    InvalidConfig,
 }
 
-pub(super) fn run() -> Result<(), ConfigValidateError> {
-    read_server_toml()?.validate()?;
-    read_client_toml()?.validate()?;
-    Ok(())
+#[derive(thiserror::Error, Debug)]
+enum ReadError {
+    #[error(transparent)]
+    ReadFile(#[from] std::io::Error),
+    #[error("the config file is not written in the correct format")]
+    InvalidFormat(#[from] toml::de::Error),
 }
 
-fn read_server_toml() -> Result<server::Config, ReadConfigError> {
+pub(super) fn run() -> Result<(), ValidationError> {
+    let server_validation_result = match read_server_toml() {
+        Ok(config) => config.validate().map_err(|err| {
+            cprintln!("<r!><bold>config/server.toml is invalid.</></>\n{}", err);
+            ValidationError::InvalidConfig
+        }),
+        Err(ReadError::InvalidFormat(err)) => {
+            cprintln!("<r!><bold>config/server.toml is invalid.</></>\n{}", err);
+            Err(ValidationError::InvalidConfig)
+        }
+        Err(ReadError::ReadFile(err)) => Err(ValidationError::ReadFile(err)),
+    };
+
+    let client_validation_result = match read_client_toml() {
+        Ok(config) => config.validate().map_err(|err| {
+            cprintln!("<r!><bold>config/client.toml is invalid.</></>\n{}", err);
+            ValidationError::InvalidConfig
+        }),
+        Err(ReadError::InvalidFormat(err)) => {
+            cprintln!("<r!><bold>config/client.toml is invalid.</></>\n{}", err);
+            Err(ValidationError::InvalidConfig)
+        }
+        Err(ReadError::ReadFile(err)) => Err(ValidationError::ReadFile(err)),
+    };
+
+    if server_validation_result.is_ok() && client_validation_result.is_ok() {
+        cprintln!("<g!><bold>config/server.toml and config/client.toml are valid!</></>");
+        cprintln!("<bold>Note:</> This is only a formal validation, so this does not guarantee that the settings are appropriate.");
+    }
+
+    server_validation_result.and_then(|_| client_validation_result)
+}
+
+fn read_server_toml() -> Result<server::Config, ReadError> {
     let mut file = fs::File::open("config/server.toml")?;
 
     let mut buffer = String::new();
     file.read_to_string(&mut buffer)?;
 
-    toml::from_str(&buffer).map_err(ReadConfigError::InvalidServerTomlFormat)
+    toml::from_str(&buffer).map_err(ReadError::InvalidFormat)
 }
 
-fn read_client_toml() -> Result<client::Config, ReadConfigError> {
+fn read_client_toml() -> Result<client::Config, ReadError> {
     let mut file = fs::File::open("config/client.toml")?;
 
     let mut buffer = String::new();
     file.read_to_string(&mut buffer)?;
 
-    toml::from_str(&buffer).map_err(ReadConfigError::InvalidClientTomlFormat)
+    toml::from_str(&buffer).map_err(ReadError::InvalidFormat)
 }
diff --git a/src/config/client.rs b/src/config/client.rs
index ea5ace5..863e6d2 100644
--- a/src/config/client.rs
+++ b/src/config/client.rs
@@ -10,9 +10,12 @@ use validator::{Validate, ValidationError};
 
 #[derive(Deserialize, Serialize, Validate, Debug)]
 pub struct Config {
+    #[validate(nested)]
     pub theme: Option<Theme>,
+    #[validate(nested)]
     pub image: Option<Image>,
-    pub pinned_links: Vec<WebSite>,
+    #[validate(nested)]
+    pub pinned_links: Option<Vec<WebSite>>,
 }
 
 #[derive(Deserialize, Serialize, Validate, Debug)]
diff --git a/src/config/server.rs b/src/config/server.rs
index 9593b93..c0cc8f5 100644
--- a/src/config/server.rs
+++ b/src/config/server.rs
@@ -6,15 +6,21 @@
 // does not take care of it.
 
 use serde::{Deserialize, Serialize};
-use validator::Validate;
+use validator::{Validate, ValidationErrors};
 
 #[derive(Deserialize, Serialize, Validate, Debug)]
 pub struct Config {
+    #[validate(nested)]
     pub info: Option<Info>,
+    #[validate(nested)]
     pub timelines: Option<Timelines>,
+    #[validate(nested)]
     pub network: Network,
+    #[validate(nested)]
     pub database: Database,
+    #[validate(nested)]
     pub cache_server: CacheServer,
+    #[validate(nested)]
     pub id: Option<Id>,
 }