diff --git a/Cargo.lock b/Cargo.lock
index 2339016..deb4d1c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -107,7 +107,7 @@ checksum = "6e0c28dcc82d7c8ead5cb13beb15405b57b8546e93215673ff8ca0349a028107"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.72",
 ]
 
 [[package]]
@@ -220,7 +220,7 @@ dependencies = [
  "heck 0.4.1",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.72",
 ]
 
 [[package]]
@@ -439,6 +439,41 @@ dependencies = [
  "typenum",
 ]
 
+[[package]]
+name = "darling"
+version = "0.20.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6f63b86c8a8826a49b8c21f08a2d07338eec8d900540f8630dc76284be802989"
+dependencies = [
+ "darling_core",
+ "darling_macro",
+]
+
+[[package]]
+name = "darling_core"
+version = "0.20.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "95133861a8032aaea082871032f5815eb9e98cef03fa916ab4500513994df9e5"
+dependencies = [
+ "fnv",
+ "ident_case",
+ "proc-macro2",
+ "quote",
+ "strsim",
+ "syn 2.0.72",
+]
+
+[[package]]
+name = "darling_macro"
+version = "0.20.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d336a2a514f6ccccaa3e09b02d41d35330c07ddf03a62165fcec10bb561c7806"
+dependencies = [
+ "darling_core",
+ "quote",
+ "syn 2.0.72",
+]
+
 [[package]]
 name = "der"
 version = "0.7.9"
@@ -642,7 +677,7 @@ checksum = "87750cf4b7a4c0625b1529e4c543c2182106e4dedc60a2a6455e00d212c489ac"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.72",
 ]
 
 [[package]]
@@ -921,6 +956,12 @@ dependencies = [
  "cc",
 ]
 
+[[package]]
+name = "ident_case"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b9e0384b61958566e926dc50660321d12159025e767c18e043daf26b70104c39"
+
 [[package]]
 name = "idna"
 version = "0.5.0"
@@ -950,6 +991,15 @@ dependencies = [
  "generic-array",
 ]
 
+[[package]]
+name = "itertools"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "413ee7dfc52ee1a4949ceeb7dbc8a33f2d6c088194d9f922fb8318faf1f01186"
+dependencies = [
+ "either",
+]
+
 [[package]]
 name = "itoa"
 version = "1.0.11"
@@ -1326,7 +1376,7 @@ checksum = "2f38a4412a78282e09a2cf38d195ea5420d15ba0602cb375210efbc877243965"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.72",
 ]
 
 [[package]]
@@ -1383,6 +1433,30 @@ dependencies = [
  "zerocopy",
 ]
 
+[[package]]
+name = "proc-macro-error"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "da25490ff9892aab3fcf7c36f08cfb902dd3e71ca0f9f9517bea02a73a5ce38c"
+dependencies = [
+ "proc-macro-error-attr",
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+ "version_check",
+]
+
+[[package]]
+name = "proc-macro-error-attr"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a1be40180e52ecc98ad80b184934baf3d0d29f979574e439af5a55274b35f869"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "version_check",
+]
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.86"
@@ -1402,6 +1476,7 @@ dependencies = [
  "chrono",
  "dotenvy",
  "futures",
+ "itertools",
  "jsonwebtoken",
  "rand",
  "scrypt",
@@ -1417,6 +1492,7 @@ dependencies = [
  "tracing",
  "tracing-subscriber",
  "uuid",
+ "validator",
 ]
 
 [[package]]
@@ -1670,7 +1746,7 @@ checksum = "e0cd7e117be63d3c3678776753929474f3b04a43a080c744d6b0ae2a8c28e222"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.72",
 ]
 
 [[package]]
@@ -1884,7 +1960,7 @@ dependencies = [
  "quote",
  "sqlx-core",
  "sqlx-macros-core",
- "syn",
+ "syn 2.0.72",
 ]
 
 [[package]]
@@ -1907,7 +1983,7 @@ dependencies = [
  "sqlx-mysql",
  "sqlx-postgres",
  "sqlx-sqlite",
- "syn",
+ "syn 2.0.72",
  "tempfile",
  "tokio",
  "url",
@@ -2033,12 +2109,28 @@ dependencies = [
  "unicode-properties",
 ]
 
+[[package]]
+name = "strsim"
+version = "0.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7da8b5736845d9f2fcb837ea5d9e2628564b3b043a70948a3f0b778838c5fb4f"
+
 [[package]]
 name = "subtle"
 version = "2.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "13c2bddecc57b384dee18652358fb23172facb8a2c51ccc10d74c157bdea3292"
 
+[[package]]
+name = "syn"
+version = "1.0.109"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
+dependencies = [
+ "proc-macro2",
+ "unicode-ident",
+]
+
 [[package]]
 name = "syn"
 version = "2.0.72"
@@ -2092,7 +2184,7 @@ checksum = "a4558b58466b9ad7ca0f102865eccc95938dca1a74a856f2b57b6629050da261"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.72",
 ]
 
 [[package]]
@@ -2176,7 +2268,7 @@ checksum = "693d596312e88961bc67d7f1f97af8a70227d9f90c31bba5806eec004978d752"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.72",
 ]
 
 [[package]]
@@ -2273,7 +2365,7 @@ checksum = "34704c8d6ebcbc939824180af020566b01a7c01f80641264eba0999f6c2b6be7"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.72",
 ]
 
 [[package]]
@@ -2382,6 +2474,36 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "validator"
+version = "0.18.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "db79c75af171630a3148bd3e6d7c4f42b6a9a014c2945bc5ed0020cbb8d9478e"
+dependencies = [
+ "idna",
+ "once_cell",
+ "regex",
+ "serde",
+ "serde_derive",
+ "serde_json",
+ "url",
+ "validator_derive",
+]
+
+[[package]]
+name = "validator_derive"
+version = "0.18.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "55591299b7007f551ed1eb79a684af7672c19c3193fb9e0a31936987bb2438ec"
+dependencies = [
+ "darling",
+ "once_cell",
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.72",
+]
+
 [[package]]
 name = "valuable"
 version = "0.1.0"
@@ -2433,7 +2555,7 @@ dependencies = [
  "once_cell",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.72",
  "wasm-bindgen-shared",
 ]
 
@@ -2455,7 +2577,7 @@ checksum = "e94f17b526d0a461a191c78ea52bbce64071ed5c04c9ffe424dcb38f74171bb7"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.72",
  "wasm-bindgen-backend",
  "wasm-bindgen-shared",
 ]
@@ -2670,7 +2792,7 @@ checksum = "fa4f8080344d4671fb4e831a13ad1e68092748387dfc4f55e356242fae12ce3e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.72",
 ]
 
 [[package]]
diff --git a/Cargo.toml b/Cargo.toml
index fe7d612..0fcb12c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,6 +22,7 @@ axum-extra = { version = "0.9", features = ["typed-header"] }
 chrono = { version = "0.4", features = ["serde"] }
 dotenvy = "0.15"
 futures = "0.3"
+itertools = "0.13.0"
 jsonwebtoken = "9"
 rand = "0.8"
 scrypt = { version = "0.11", default-features = false, features = ["std"] }
@@ -52,3 +53,4 @@ tracing-subscriber = { version = "0.3", features = [
     "env-filter",
 ] }
 uuid = { version = "1", features = ["serde", "v7"] }
+validator = { version = "0.18", features = ["derive"] }
diff --git a/sql/get_folders.sql b/sql/get_folders.sql
index 084f0c5..f17eca1 100644
--- a/sql/get_folders.sql
+++ b/sql/get_folders.sql
@@ -5,7 +5,7 @@ SELECT
     created_at
 FROM
     folders f
-    JOIN permissions p ON f.folder_id = p.folder_id
+    LEFT JOIN permissions p ON f.folder_id = p.folder_id
 WHERE
     parent_folder_id = $1
-    AND p.user_id = $2
\ No newline at end of file
+    AND (p.user_id = $2 OR f.owner_id = $2)
\ No newline at end of file
diff --git a/src/auth.rs b/src/auth.rs
index 189540a..19460a7 100644
--- a/src/auth.rs
+++ b/src/auth.rs
@@ -10,6 +10,7 @@ use axum_extra::{
     headers::{authorization::Bearer, Authorization},
     TypedHeader,
 };
+use chrono::{TimeDelta, Utc};
 use jsonwebtoken::{decode, encode, DecodingKey, EncodingKey, Header, Validation};
 use rand::{rngs::OsRng, RngCore};
 use serde::{Deserialize, Serialize};
@@ -122,6 +123,13 @@ pub struct Claims {
 }
 
 impl Claims {
+    pub fn new(user_id: i32) -> Self {
+        Self {
+            user_id,
+            exp: (Utc::now() + TimeDelta::days(30)).timestamp(),
+        }
+    }
+
     pub fn encode(self) -> Result<Token, Error> {
         let access_token = encode(
             &Header::new(jsonwebtoken::Algorithm::HS256),
diff --git a/src/db/users.rs b/src/db/users.rs
index add0e8e..4e55314 100644
--- a/src/db/users.rs
+++ b/src/db/users.rs
@@ -10,16 +10,19 @@ pub async fn create_user(
     user_email: &str,
     hashed_password: &[u8],
     pool: &Pool,
-) -> sqlx::Result<i32> {
-    let id = sqlx::query!(
+) -> sqlx::Result<Option<i32>> {
+    let Some(record) = sqlx::query!(
         "INSERT INTO users(username, email, hashed_password) VALUES ($1, $2, $3) RETURNING user_id",
         user_name,
         user_email,
         hashed_password
     )
-    .fetch_one(pool)
+    .fetch_optional(pool)
     .await?
-    .user_id;
+    else {
+        return Ok(None);
+    };
+    let id = record.user_id;
     sqlx::query!(
         "INSERT INTO folders(owner_id, folder_name) VALUES ($1, $2)",
         id,
@@ -27,7 +30,7 @@ pub async fn create_user(
     )
     .execute(pool)
     .await?;
-    Ok(id)
+    Ok(Some(id))
 }
 
 /// Deletes the user and returns the files that must be deleted
diff --git a/src/endpoints/authorization/auth_post.rs b/src/endpoints/authorization/auth_post.rs
index 72381bc..00e942d 100644
--- a/src/endpoints/authorization/auth_post.rs
+++ b/src/endpoints/authorization/auth_post.rs
@@ -1,5 +1,4 @@
 use axum::Form;
-use chrono::TimeDelta;
 
 use crate::{
     auth::{authenticate_user, Error, Token},
@@ -12,24 +11,13 @@ pub struct Params {
     password: String,
 }
 
-fn get_exp() -> i64 {
-    let mut time = chrono::Utc::now();
-    time += TimeDelta::days(30);
-    time.timestamp()
-}
-
 pub async fn post(
-    State(state): State<AppState>,
+    State(pool): State<Pool>,
     Form(payload): Form<Params>,
 ) -> Result<Json<Token>, Error> {
-    let user_id = authenticate_user(&payload.username, &payload.password, &state.pool)
+    let user_id = authenticate_user(&payload.username, &payload.password, &pool)
         .await
         .map_err(|_| Error::WrongCredentials)?
         .ok_or(Error::WrongCredentials)?;
-    Claims {
-        user_id,
-        exp: get_exp(),
-    }
-    .encode()
-    .map(Json)
+    Claims::new(user_id).encode().map(Json)
 }
diff --git a/src/endpoints/authorization/mod.rs b/src/endpoints/authorization/mod.rs
index 8052f27..d7dc2a2 100644
--- a/src/endpoints/authorization/mod.rs
+++ b/src/endpoints/authorization/mod.rs
@@ -1 +1,2 @@
 pub mod auth_post;
+pub mod register;
diff --git a/src/endpoints/authorization/register.rs b/src/endpoints/authorization/register.rs
new file mode 100644
index 0000000..0130b89
--- /dev/null
+++ b/src/endpoints/authorization/register.rs
@@ -0,0 +1,68 @@
+use axum::Form;
+use axum_extra::either::Either;
+use itertools::Itertools;
+use validator::{Validate, ValidationError};
+
+use crate::{
+    auth::{Error, HashedBytes, Token},
+    prelude::*,
+};
+
+#[derive(Deserialize, Debug, Validate)]
+pub struct Params {
+    #[validate(length(min = 3, max = 10))]
+    username: String,
+    #[validate(email)]
+    email: String,
+    #[validate(length(min = 6), custom(function = "validate_password"))]
+    password: String,
+}
+
+fn validate_password(password: &str) -> Result<(), ValidationError> {
+    let mut has_lower = false;
+    let mut has_upper = false;
+    let mut has_number = false;
+    let mut has_special = false;
+    for char in password.chars() {
+        if char.is_lowercase() {
+            has_lower = true;
+        } else if char.is_uppercase() {
+            has_upper = true;
+        } else if char.is_ascii_digit() {
+            has_number = true;
+        } else {
+            has_special = true;
+        }
+    }
+    let error_msgs = [has_lower, has_upper, has_number, has_special]
+        .into_iter()
+        .zip(["No lower", "No upper", "No numbers", "No special"])
+        .filter_map(|(param, msg)| (!param).then_some(msg));
+    let msg = error_msgs.format(" ").to_string();
+    if !msg.is_empty() {
+        return Err(ValidationError::new("invalid_password").with_message(msg.into()));
+    }
+    Ok(())
+}
+
+pub async fn register(
+    State(pool): State<Pool>,
+    Form(params): Form<Params>,
+) -> Result<Json<Token>, Either<(StatusCode, String), Error>> {
+    params
+        .validate()
+        .map_err(|err| Either::E1((StatusCode::BAD_REQUEST, err.to_string())))?;
+    let password = HashedBytes::hash_bytes(params.password.as_bytes()).as_bytes();
+    let Some(id) = db::users::create_user(&params.username, &params.email, &password, &pool)
+        .await
+        .handle_internal()
+        .map_err(|status| Either::E1((status, String::new())))?
+    else {
+        return Err(Either::E1((
+            StatusCode::BAD_REQUEST,
+            "Either the user name or the email are taken".to_owned(),
+        )));
+    };
+    let token = Claims::new(id).encode().map_err(Either::E2)?;
+    Ok(Json(token))
+}
diff --git a/src/endpoints/folder/get_structure.rs b/src/endpoints/folder/get_structure.rs
index 3dbb8c7..812df99 100644
--- a/src/endpoints/folder/get_structure.rs
+++ b/src/endpoints/folder/get_structure.rs
@@ -22,17 +22,11 @@ impl From<db::folder::FolderWithoutParentId> for FolderStructure {
     }
 }
 
-#[derive(Debug, Serialize)]
-pub struct Response {
-    folder_id: Uuid,
-    structure: FolderStructure,
-}
-
 pub async fn structure(
     Query(params): Query<Params>,
     State(pool): State<Pool>,
     claims: Claims,
-) -> Result<Json<Response>, StatusCode> {
+) -> Result<Json<FolderStructure>, StatusCode> {
     let folder_id = db::folder::process_id(params.folder_id, claims.user_id, &pool)
         .await
         .handle_internal()?
@@ -41,15 +35,12 @@ pub async fn structure(
         .await
         .handle_internal()?
         .ok_or(StatusCode::NOT_FOUND)?;
-    let mut response = Response {
-        folder_id,
-        structure: folder.into(),
-    };
-    let mut stack = vec![&mut response.structure];
+    let mut response: FolderStructure = folder.into();
+    let mut stack = vec![&mut response];
     while let Some(folder) = stack.pop() {
         let (files, folders) = try_join!(
-            db::file::get_files(folder_id, &pool).try_collect(),
-            db::folder::get_folders(folder_id, claims.user_id, &pool)
+            db::file::get_files(folder.folder_base.folder_id, &pool).try_collect(),
+            db::folder::get_folders(folder.folder_base.folder_id, claims.user_id, &pool)
                 .map_ok(Into::into)
                 .try_collect()
         )
diff --git a/src/endpoints/users/put.rs b/src/endpoints/users/put.rs
index e62c5ec..8a8cdbf 100644
--- a/src/endpoints/users/put.rs
+++ b/src/endpoints/users/put.rs
@@ -1,8 +1,12 @@
+use validator::Validate;
+
 use crate::prelude::*;
 
-#[derive(Deserialize, Debug)]
+#[derive(Deserialize, Debug, Validate)]
 pub struct Params {
+    #[validate(email)]
     username: String,
+    #[validate(email)]
     email: String,
 }
 
@@ -10,9 +14,13 @@ pub async fn put(
     State(pool): State<Pool>,
     claims: Claims,
     Json(params): Json<Params>,
-) -> Result<Json<db::users::UserInfo>, StatusCode> {
+) -> Result<Json<db::users::UserInfo>, (StatusCode, String)> {
+    params
+        .validate()
+        .map_err(|err| (StatusCode::BAD_REQUEST, err.to_string()))?;
     let info = db::users::update(claims.user_id, &params.username, &params.email, &pool)
         .await
-        .handle_internal()?;
+        .handle_internal()
+        .map_err(|status| (status, String::new()))?;
     Ok(Json(info))
 }
diff --git a/src/main.rs b/src/main.rs
index edd1a03..ef788b5 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -121,6 +121,7 @@ fn app(state: AppState) -> Router {
         )
         .route("/users/current", get(users::get::current))
         .route("/users/search", get(users::search::search))
+        .route("/register", post(authorization::register::register))
         .route("/authorize", post(authorization::auth_post::post))
         .layer(middleware)
         .with_state(state)