diff --git a/auth/redis-session/src/main.rs b/auth/redis-session/src/main.rs
index a60649b..259a17b 100644
--- a/auth/redis-session/src/main.rs
+++ b/auth/redis-session/src/main.rs
@@ -124,7 +124,7 @@ mod test {
                         RedisActorSessionStore::new("127.0.0.1:6379"),
                         private_key.clone(),
                     )
-                    .cookie_name("test-session".to_string())
+                    .cookie_name("test-session".to_owned())
                     .build(),
                 )
                 .wrap(middleware::Logger::default())
diff --git a/auth/simple-auth-server/src/errors.rs b/auth/simple-auth-server/src/errors.rs
index 618154b..54c29d1 100644
--- a/auth/simple-auth-server/src/errors.rs
+++ b/auth/simple-auth-server/src/errors.rs
@@ -45,7 +45,7 @@ impl From<DBError> for ServiceError {
         match error {
             DBError::DatabaseError(kind, info) => {
                 if let DatabaseErrorKind::UniqueViolation = kind {
-                    let message = info.details().unwrap_or_else(|| info.message()).to_string();
+                    let message = info.details().unwrap_or_else(|| info.message()).to_owned();
                     return ServiceError::BadRequest(message);
                 }
                 ServiceError::InternalServerError
diff --git a/auth/simple-auth-server/src/main.rs b/auth/simple-auth-server/src/main.rs
index 53d0e42..6f6a8a9 100644
--- a/auth/simple-auth-server/src/main.rs
+++ b/auth/simple-auth-server/src/main.rs
@@ -28,7 +28,7 @@ async fn main() -> std::io::Result<()> {
     let pool: models::Pool = r2d2::Pool::builder()
         .build(manager)
         .expect("Failed to create pool.");
-    let domain: String = std::env::var("DOMAIN").unwrap_or_else(|_| "localhost".to_string());
+    let domain: String = std::env::var("DOMAIN").unwrap_or_else(|_| "localhost".to_owned());
 
     log::info!("starting HTTP server at http://localhost:8080");
 
diff --git a/forms/form/src/main.rs b/forms/form/src/main.rs
index 7329acb..c7a0c73 100644
--- a/forms/form/src/main.rs
+++ b/forms/form/src/main.rs
@@ -21,7 +21,7 @@ fn app_config(config: &mut web::ServiceConfig) {
     config.service(
         web::scope("")
             .app_data(web::Data::new(AppState {
-                foo: "bar".to_string(),
+                foo: "bar".to_owned(),
             }))
             .service(web::resource("/").route(web::get().to(index)))
             .service(web::resource("/post1").route(web::post().to(handle_post_1)))
@@ -96,7 +96,7 @@ mod tests {
     #[actix_web::test]
     async fn handle_post_1_unit_test() {
         let params = Form(MyParams {
-            name: "John".to_string(),
+            name: "John".to_owned(),
         });
         let resp = handle_post_1(params).await.unwrap();
 
@@ -116,7 +116,7 @@ mod tests {
         let req = test::TestRequest::post()
             .uri("/post1")
             .set_form(MyParams {
-                name: "John".to_string(),
+                name: "John".to_owned(),
             })
             .to_request();
         let resp: ServiceResponse = test::call_service(&app, req).await;
@@ -134,12 +134,12 @@ mod tests {
     async fn handle_post_2_unit_test() {
         let state = TestRequest::default()
             .data(AppState {
-                foo: "bar".to_string(),
+                foo: "bar".to_owned(),
             })
             .to_http_request();
         let data = state.app_data::<actix_web::web::Data<AppState>>().unwrap();
         let params = Form(MyParams {
-            name: "John".to_string(),
+            name: "John".to_owned(),
         });
         let resp = handle_post_2(data.clone(), params).await.unwrap();
 
@@ -161,7 +161,7 @@ mod tests {
         let req = test::TestRequest::post()
             .uri("/post2")
             .set_form(MyParams {
-                name: "John".to_string(),
+                name: "John".to_owned(),
             })
             .to_request();
         let resp: ServiceResponse = test::call_service(&app, req).await;
@@ -183,7 +183,7 @@ mod tests {
     async fn handle_post_3_unit_test() {
         let req = TestRequest::default().to_http_request();
         let params = Form(MyParams {
-            name: "John".to_string(),
+            name: "John".to_owned(),
         });
         let result = handle_post_3(req.clone(), params).await;
         let resp = result.respond_to(&req);
@@ -205,7 +205,7 @@ mod tests {
         let req = test::TestRequest::post()
             .uri("/post3")
             .set_form(MyParams {
-                name: "John".to_string(),
+                name: "John".to_owned(),
             })
             .to_request();
         let resp: ServiceResponse = test::call_service(&app, req).await;
diff --git a/https-tls/openssl-auto-le/src/main.rs b/https-tls/openssl-auto-le/src/main.rs
index bbb4be1..7291c50 100644
--- a/https-tls/openssl-auto-le/src/main.rs
+++ b/https-tls/openssl-auto-le/src/main.rs
@@ -14,7 +14,7 @@ pub async fn gen_tls_cert(user_email: &str, user_domain: &str) -> anyhow::Result
     // Create acme-challenge dir.
     fs::create_dir("./acme-challenge").unwrap();
 
-    let domain = user_domain.to_string();
+    let domain = user_domain.to_owned();
 
     // Create temporary Actix Web server for ACME challenge.
     let srv = HttpServer::new(|| {
diff --git a/json/json-error/src/main.rs b/json/json-error/src/main.rs
index 3260d27..dda7c3a 100644
--- a/json/json-error/src/main.rs
+++ b/json/json-error/src/main.rs
@@ -31,7 +31,7 @@ impl ResponseError for Error {
 
 async fn index() -> Result<HttpResponse, Error> {
     Err(Error {
-        msg: "an example error message".to_string(),
+        msg: "an example error message".to_owned(),
         status: 400,
     })
 }
diff --git a/json/json-validation/src/main.rs b/json/json-validation/src/main.rs
index 0b55505..4df73d5 100644
--- a/json/json-validation/src/main.rs
+++ b/json/json-validation/src/main.rs
@@ -16,7 +16,6 @@ use std::io;
 
 use actix_web::{
     error::ErrorBadRequest,
-    http::header::ContentType,
     web::{self, BytesMut},
     App, Error, HttpResponse, HttpServer,
 };
@@ -56,7 +55,7 @@ async fn step_x(data: SomeData, client: &Client) -> actix_web::Result<SomeData>
         body.extend_from_slice(&chunk?);
     }
 
-    let body: HttpBinResponse = serde_json::from_slice(&body).unwrap();
+    let body = serde_json::from_slice::<HttpBinResponse>(&body).unwrap();
 
     println!("{body:?}");
 
@@ -71,9 +70,7 @@ async fn create_something(
     let some_data_3 = step_x(some_data_2, &client).await?;
     let d = step_x(some_data_3, &client).await?;
 
-    Ok(HttpResponse::Ok()
-        .content_type(ContentType::json())
-        .body(serde_json::to_string(&d).unwrap()))
+    Ok(HttpResponse::Ok().json(d))
 }
 
 #[actix_web::main]
diff --git a/server-sent-events/src/main.rs b/server-sent-events/src/main.rs
index e3c4f49..04ca420 100644
--- a/server-sent-events/src/main.rs
+++ b/server-sent-events/src/main.rs
@@ -30,7 +30,7 @@ async fn main() -> io::Result<()> {
 
 #[get("/")]
 async fn index() -> impl Responder {
-    Html(include_str!("index.html").to_string())
+    Html(include_str!("index.html").to_owned())
 }
 
 #[get("/events")]
diff --git a/templating/handlebars/src/main.rs b/templating/handlebars/src/main.rs
index 7b70ac0..3e4bb1b 100644
--- a/templating/handlebars/src/main.rs
+++ b/templating/handlebars/src/main.rs
@@ -77,10 +77,10 @@ fn get_error_response<B>(res: &ServiceResponse<B>, error: &str) -> HttpResponse<
 
     // Provide a fallback to a simple plain text response in case an error occurs during the
     // rendering of the error page.
-    let fallback = |e: &str| {
+    let fallback = |err: &str| {
         HttpResponse::build(res.status())
             .content_type(ContentType::plaintext())
-            .body(e.to_string())
+            .body(err.to_string())
     };
 
     let hb = request
diff --git a/templating/sailfish/src/main.rs b/templating/sailfish/src/main.rs
index 4ab9c2c..a4e20c8 100644
--- a/templating/sailfish/src/main.rs
+++ b/templating/sailfish/src/main.rs
@@ -38,7 +38,7 @@ async fn page(params: web::Path<(i32,)>) -> actix_web::Result<impl Responder> {
 
 #[get("/")]
 async fn hello() -> impl Responder {
-    Html("<p>Hello world!</p>".to_string())
+    Html("<p>Hello world!</p>".to_owned())
 }
 
 #[actix_web::main]
diff --git a/templating/tera/src/main.rs b/templating/tera/src/main.rs
index f9648bb..ef6e1d5 100644
--- a/templating/tera/src/main.rs
+++ b/templating/tera/src/main.rs
@@ -71,10 +71,10 @@ fn get_error_response<B>(res: &ServiceResponse<B>, error: &str) -> HttpResponse
 
     // Provide a fallback to a simple plain text response in case an error occurs during the
     // rendering of the error page.
-    let fallback = |e: &str| {
+    let fallback = |err: &str| {
         HttpResponse::build(res.status())
             .content_type(ContentType::plaintext())
-            .body(e.to_string())
+            .body(err.to_string())
     };
 
     let tera = request.app_data::<web::Data<Tera>>().map(|t| t.get_ref());
diff --git a/templating/tinytemplate/src/main.rs b/templating/tinytemplate/src/main.rs
index 06d2ba3..515de61 100644
--- a/templating/tinytemplate/src/main.rs
+++ b/templating/tinytemplate/src/main.rs
@@ -75,10 +75,10 @@ fn get_error_response<B>(res: &ServiceResponse<B>, error: &str) -> HttpResponse
 
     // Provide a fallback to a simple plain text response in case an error occurs during the
     // rendering of the error page.
-    let fallback = |e: &str| {
+    let fallback = |err: &str| {
         HttpResponse::build(res.status())
             .content_type(ContentType::plaintext())
-            .body(e.to_string())
+            .body(err.to_string())
     };
 
     let tt = request
diff --git a/websockets/chat-broker/src/server.rs b/websockets/chat-broker/src/server.rs
index f09ed77..8908e6e 100644
--- a/websockets/chat-broker/src/server.rs
+++ b/websockets/chat-broker/src/server.rs
@@ -76,7 +76,7 @@ impl Handler<JoinRoom> for WsChatServer {
         let id = self.add_client_to_room(&room_name, None, client);
         let join_msg = format!(
             "{} joined {room_name}",
-            client_name.unwrap_or_else(|| "anon".to_string()),
+            client_name.unwrap_or_else(|| "anon".to_owned()),
         );
 
         self.send_chat_message(&room_name, &join_msg, id);
diff --git a/websockets/chat-broker/src/session.rs b/websockets/chat-broker/src/session.rs
index 5755254..ae9d483 100644
--- a/websockets/chat-broker/src/session.rs
+++ b/websockets/chat-broker/src/session.rs
@@ -64,7 +64,7 @@ impl WsChatSession {
     pub fn send_msg(&self, msg: &str) {
         let content = format!(
             "{}: {msg}",
-            self.name.clone().unwrap_or_else(|| "anon".to_string()),
+            self.name.clone().unwrap_or_else(|| "anon".to_owned()),
         );
 
         let msg = SendMessage(self.room.clone(), self.id, content);
@@ -84,7 +84,7 @@ impl Actor for WsChatSession {
     fn stopped(&mut self, _ctx: &mut Self::Context) {
         log::info!(
             "WsChatSession closed for {}({}) in room {}",
-            self.name.clone().unwrap_or_else(|| "anon".to_string()),
+            self.name.clone().unwrap_or_else(|| "anon".to_owned()),
             self.id,
             self.room
         );