diff --git a/.changes/contest.md b/.changes/contest.md
new file mode 100644
index 0000000..e18d029
--- /dev/null
+++ b/.changes/contest.md
@@ -0,0 +1,5 @@
+---
+"algohub-server": patch:feat
+---
+
+Support create and list all contests.
diff --git a/Cargo.lock b/Cargo.lock
index 13552c9..893d82d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -71,7 +71,7 @@ dependencies = [
 
 [[package]]
 name = "algohub-server"
-version = "0.1.10"
+version = "0.1.12"
 dependencies = [
  "anyhow",
  "chrono",
diff --git a/src/models/account.rs b/src/models/account.rs
index 6dd64bf..fc5fdd1 100644
--- a/src/models/account.rs
+++ b/src/models/account.rs
@@ -43,6 +43,7 @@ pub struct Login<'r> {
 }
 
 #[derive(Serialize, Deserialize, Clone, Debug)]
+#[serde(crate = "rocket::serde")]
 pub struct Profile {
     #[serde(skip_serializing_if = "Option::is_none")]
     pub username: Option<String>,
@@ -61,7 +62,7 @@ pub struct Profile {
     #[serde(skip_serializing_if = "Option::is_none")]
     pub sex: Option<bool>,
     #[serde(skip_serializing_if = "Option::is_none")]
-    pub birthday: Option<String>,
+    pub birthday: Option<chrono::NaiveDateTime>,
 
     #[serde(skip_serializing_if = "Option::is_none")]
     pub name: Option<String>,
diff --git a/src/models/contest.rs b/src/models/contest.rs
index 51d81f3..2015ef7 100644
--- a/src/models/contest.rs
+++ b/src/models/contest.rs
@@ -30,7 +30,6 @@ pub struct Contest {
 
     pub start_time: chrono::NaiveDateTime,
     pub end_time: chrono::NaiveDateTime,
-    pub problems: Vec<Thing>,
 
     pub owner: Thing,
     pub creator: Thing,
@@ -71,3 +70,50 @@ pub struct RemoveProblem {
     pub contest_id: Thing,
     pub problem_id: Thing,
 }
+
+#[derive(Serialize, Deserialize)]
+pub struct UserContest {
+    pub id: String,
+
+    pub name: String,
+    pub mode: Mode,
+    pub visibility: Visibility,
+    pub description: String,
+    pub announcement: Option<String>,
+
+    pub start_time: chrono::NaiveDateTime,
+    pub end_time: chrono::NaiveDateTime,
+
+    pub owner: UserRecordId,
+    pub creator: String,
+    pub updaters: Vec<String>,
+    pub participants: Vec<String>,
+
+    pub created_at: chrono::NaiveDateTime,
+    pub updated_at: chrono::NaiveDateTime,
+}
+
+impl From<Contest> for UserContest {
+    fn from(value: Contest) -> Self {
+        UserContest {
+            id: value.id.unwrap().id.to_string(),
+            name: value.name,
+            mode: value.mode,
+            visibility: value.visibility,
+            description: value.description,
+            announcement: value.announcement,
+            start_time: value.start_time,
+            end_time: value.end_time,
+            owner: value.owner.into(),
+            creator: value.creator.to_string(),
+            updaters: value.updaters.iter().map(|x| x.id.to_string()).collect(),
+            participants: value
+                .participants
+                .iter()
+                .map(|x| x.id.to_string())
+                .collect(),
+            created_at: value.created_at,
+            updated_at: value.updated_at,
+        }
+    }
+}
diff --git a/src/models/problem.rs b/src/models/problem.rs
index b788b00..53ff36d 100644
--- a/src/models/problem.rs
+++ b/src/models/problem.rs
@@ -54,6 +54,7 @@ pub struct Problem {
     pub tags: Vec<String>,
 
     pub visibility: ProblemVisibility,
+    pub contest: Option<Thing>,
 
     pub created_at: chrono::NaiveDateTime,
     pub updated_at: chrono::NaiveDateTime,
@@ -110,6 +111,7 @@ impl From<CreateProblem<'_>> for Problem {
             categories: val.categories,
             tags: val.tags,
             visibility: val.visibility,
+            contest: None,
             created_at: chrono::Local::now().naive_local(),
             updated_at: chrono::Local::now().naive_local(),
         }
diff --git a/src/routes/account.rs b/src/routes/account.rs
index 2abc36c..f407f8d 100644
--- a/src/routes/account.rs
+++ b/src/routes/account.rs
@@ -55,14 +55,11 @@ pub async fn profile(
     profile: Json<MergeProfile<'_>>,
 ) -> Result<Empty> {
     account::get_by_id::<Record>(db, profile.id)
-        .await
-        .map_err(|e| Error::ServerError(Json(e.to_string().into())))?
+        .await?
         .ok_or(Error::NotFound(Json("Account not found".into())))?;
 
     if session::verify(db, profile.id, profile.token).await {
-        account::merge_profile(db, profile.id, profile.profile.clone())
-            .await
-            .map_err(|e| Error::ServerError(Json(e.to_string().into())))?;
+        account::merge_profile(db, profile.id, profile.profile.clone()).await?;
         Ok(Response {
             success: true,
             message: "Profile updated successfully".into(),
@@ -70,15 +67,14 @@ pub async fn profile(
         }
         .into())
     } else {
-        Err(Error::Unauthorized(Json("Invalid token".into())))
+        Err(Error::Unauthorized(Json("Invalid credentials".into())))
     }
 }
 
 #[get("/profile/<id>")]
 pub async fn get_profile(db: &State<Surreal<Client>>, id: &str) -> Result<Profile> {
     let profile = account::get_by_identity::<Profile>(db, id)
-        .await
-        .map_err(|e| Error::ServerError(Json(e.to_string().into())))?
+        .await?
         .ok_or(Error::NotFound(Json("Account not found".into())))?;
 
     Ok(Response {
@@ -97,13 +93,9 @@ pub async fn delete(db: &State<Surreal<Client>>, id: &str, auth: Json<Token<'_>>
         )));
     }
 
-    account::delete(db, id)
-        .await
-        .map_err(|e| Error::ServerError(Json(e.to_string().into())))?;
+    account::delete(db, id).await?;
 
-    remove_dir_all(Path::new("content/").join(id))
-        .await
-        .map_err(|e| Error::ServerError(Json(e.to_string().into())))?;
+    remove_dir_all(Path::new("content/").join(id)).await?;
 
     Ok(Response {
         success: true,
diff --git a/src/routes/contest.rs b/src/routes/contest.rs
index 706f0bc..7e86d7e 100644
--- a/src/routes/contest.rs
+++ b/src/routes/contest.rs
@@ -3,10 +3,10 @@ use surrealdb::{engine::remote::ws::Client, sql::Thing, Surreal};
 
 use crate::{
     models::{
-        contest::{AddProblems, CreateContest},
+        contest::{AddProblems, CreateContest, UserContest},
         error::Error,
         response::{Empty, Response},
-        OwnedId,
+        Credentials, OwnedId,
     },
     utils::{contest, session},
     Result,
@@ -15,13 +15,12 @@ use crate::{
 #[post("/create", data = "<contest>")]
 pub async fn create(db: &State<Surreal<Client>>, contest: Json<CreateContest>) -> Result<OwnedId> {
     if !session::verify(db, &contest.auth.id, &contest.auth.token).await {
-        return Err(Error::Unauthorized(Json("Invalid session".into())));
+        return Err(Error::Unauthorized(Json("Invalid credentials".into())));
     }
 
     let contest = contest.into_inner();
     let contest = contest::create(db, &contest.auth.id, contest.data)
-        .await
-        .map_err(|e| Error::ServerError(Json(e.into())))?
+        .await?
         .ok_or(Error::ServerError(Json("Failed to create contest".into())))?;
 
     Ok(Json(Response {
@@ -34,27 +33,15 @@ pub async fn create(db: &State<Surreal<Client>>, contest: Json<CreateContest>) -
 }
 
 #[post("/problems/add", data = "<data>")]
-pub async fn add_problem(
+pub async fn add_problems(
     db: &State<Surreal<Client>>,
     data: Json<AddProblems<'_>>,
 ) -> Result<Empty> {
     if !session::verify(db, &data.auth.id, &data.auth.token).await {
-        return Err(Error::Unauthorized(Json("Invalid session".into())));
+        return Err(Error::Unauthorized(Json("Invalid credentials".into())));
     }
 
     let problem = data.into_inner();
-    contest::add_problems(
-        db,
-        problem.contest_id,
-        &problem
-            .problem_ids
-            .iter()
-            .map(|&p| Thing::from(("problem", p)))
-            .collect::<Vec<Thing>>(),
-    )
-    .await
-    .map_err(|e| Error::ServerError(Json(e.into())))?
-    .ok_or(Error::NotFound(Json("Contest not found".into())))?;
 
     Ok(Json(Response {
         success: true,
@@ -63,7 +50,24 @@ pub async fn add_problem(
     }))
 }
 
+#[post("/list/all", data = "<auth>")]
+pub async fn list_all(
+    db: &State<Surreal<Client>>,
+    auth: Json<Credentials<'_>>,
+) -> Result<Vec<UserContest>> {
+    if !session::verify(db, &auth.id, &auth.token).await {
+        return Err(Error::Unauthorized(Json("Invalid credentials".into())));
+    }
+
+    let contests = contest::list_all(db).await?;
+    Ok(Json(Response {
+        success: true,
+        message: "Contests listed successfully".into(),
+        data: Some(contests.into_iter().map(|c| c.into()).collect()),
+    }))
+}
+
 pub fn routes() -> Vec<rocket::Route> {
     use rocket::routes;
-    routes![create, add_problem]
+    routes![create, add_problems, list_all]
 }
diff --git a/src/routes/problem.rs b/src/routes/problem.rs
index 05a7e91..7f02913 100644
--- a/src/routes/problem.rs
+++ b/src/routes/problem.rs
@@ -113,7 +113,7 @@ pub async fn list(
 ) -> Result<Vec<UserProblem>> {
     let authed_id = if let Some(auth) = &data.auth {
         if !session::verify(db, &auth.id, &auth.token).await {
-            return Err(Error::Unauthorized(Json("Invalid token".into())));
+            return Err(Error::Unauthorized(Json("Invalid credentials".into())));
         };
         Some(auth.id.clone())
     } else {
@@ -125,8 +125,7 @@ pub async fn list(
     let account_id = if let Some(identity) = data.identity.clone() {
         Some(
             account::get_by_identity::<Account>(db, &identity)
-                .await
-                .map_err(|e| Error::ServerError(Json(e.to_string().into())))?
+                .await?
                 .ok_or(Error::Unauthorized(Json("Invalid identity".into())))?
                 .id
                 .unwrap()
@@ -137,9 +136,8 @@ pub async fn list(
         None
     };
 
-    let problems = problem::list_for_account::<Problem>(db, account_id, authed_id, data.limit)
-        .await
-        .map_err(|e| Error::ServerError(Json(e.to_string().into())))?;
+    let problems =
+        problem::list_for_account::<Problem>(db, account_id, authed_id, data.limit).await?;
 
     Ok(Json(Response {
         success: true,
diff --git a/src/utils/contest.rs b/src/utils/contest.rs
index 749c61e..3c954b0 100644
--- a/src/utils/contest.rs
+++ b/src/utils/contest.rs
@@ -1,5 +1,5 @@
 use anyhow::Result;
-use surrealdb::{engine::remote::ws::Client, opt::PatchOp, sql::Thing, Surreal};
+use surrealdb::{engine::remote::ws::Client, sql::Thing, Surreal};
 
 use crate::models::contest::{Contest, ContestData};
 
@@ -19,7 +19,6 @@ pub async fn create(
             announcement: None,
             start_time: contest.start_time,
             end_time: contest.end_time,
-            problems: vec![],
             owner: contest.owner.clone().into(),
             creator: ("account", creator_id).into(),
             updaters: vec![("account", creator_id).into()],
@@ -34,23 +33,16 @@ pub async fn get(db: &Surreal<Client>, id: &str) -> Result<Option<Contest>> {
     Ok(db.select(("contest", id)).await?)
 }
 
-pub async fn list(db: &Surreal<Client>, id: Thing) -> Result<Vec<Contest>> {
-    Ok(db
-        .query("SELECT * FROM contest WHERE owner = $id")
-        .bind(("id", id))
-        .await?
-        .take(0)?)
+pub async fn list_all(db: &Surreal<Client>) -> Result<Vec<Contest>> {
+    Ok(db.query("SELECT * FROM contest").await?.take(0)?)
 }
 
-pub async fn add_problems(
-    db: &Surreal<Client>,
-    id: &str,
-    problems: &[Thing],
-) -> Result<Option<Contest>> {
+pub async fn list_by_owner(db: &Surreal<Client>, id: &str) -> Result<Vec<Contest>> {
     Ok(db
-        .update(("contest", id))
-        .patch(PatchOp::add("/problems", problems))
-        .await?)
+        .query("SELECT * FROM contest WHERE record::id(owner) = $id")
+        .bind(("id", id.to_string()))
+        .await?
+        .take(0)?)
 }
 
 const REMOVE_PROBLEM: &str =