diff --git a/backend/.gitignore b/backend/.gitignore
index 317753a..40b942a 100644
--- a/backend/.gitignore
+++ b/backend/.gitignore
@@ -1,4 +1,4 @@
 /target
 .vscode
-app.toml
+App.toml
 *.sqlite
diff --git a/backend/app.toml.example b/backend/App.toml.example
similarity index 100%
rename from backend/app.toml.example
rename to backend/App.toml.example
diff --git a/backend/Cargo.lock b/backend/Cargo.lock
index bfa916f..2bd89f1 100644
--- a/backend/Cargo.lock
+++ b/backend/Cargo.lock
@@ -2,6 +2,15 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "aho-corasick"
+version = "0.7.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e37cfd5e7657ada45f742d6e99ca5788580b5c529dc78faf11ece6dc702656f"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "ansi_term"
 version = "0.12.1"
@@ -397,6 +406,16 @@ version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
 
+[[package]]
+name = "form_urlencoded"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5fc25a87fa4fd2094bffb06925852034d90a17f0d1e05197d4956d3555752191"
+dependencies = [
+ "matches",
+ "percent-encoding",
+]
+
 [[package]]
 name = "fsevent"
 version = "0.4.0"
@@ -538,6 +557,7 @@ dependencies = [
  "rocket_dyn_templates",
  "rocket_sync_db_pools",
  "serde",
+ "validator",
 ]
 
 [[package]]
@@ -701,6 +721,23 @@ dependencies = [
  "want",
 ]
 
+[[package]]
+name = "idna"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "418a0a6fab821475f634efe3ccc45c013f742efe03d853e8d3355d5cb850ecf8"
+dependencies = [
+ "matches",
+ "unicode-bidi",
+ "unicode-normalization",
+]
+
+[[package]]
+name = "if_chain"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cb56e1aa765b4b4f3aadfab769793b7087bb03a4ea4920644a6d238e2df5b9ed"
+
 [[package]]
 name = "indexmap"
 version = "1.8.0"
@@ -872,6 +909,12 @@ dependencies = [
  "regex-automata",
 ]
 
+[[package]]
+name = "matches"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a3e378b66a060d48947b590737b30a1be76706c8dd7b8ba0f2fe3989c68a853f"
+
 [[package]]
 name = "memchr"
 version = "2.4.1"
@@ -1240,6 +1283,30 @@ version = "0.2.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "eb9f9e6e233e5c4a35559a617bf40a4ec447db2e84c20b55a6f83167b7e57872"
 
+[[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",
+ "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-macro-hack"
 version = "0.5.19"
@@ -1368,6 +1435,8 @@ version = "1.5.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1a11647b6b25ff05a515cb92c365cec08801e83423a235b51e231e1808747286"
 dependencies = [
+ "aho-corasick",
+ "memchr",
  "regex-syntax",
 ]
 
@@ -1924,6 +1993,21 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "tinyvec"
+version = "1.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2c1c1d5a42b6245520c249549ec267180beaffcc0615401ac8e31853d4b6d8d2"
+dependencies = [
+ "tinyvec_macros",
+]
+
+[[package]]
+name = "tinyvec_macros"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cda74da7e1a664f795bb1f8a87ec406fb89a02522cf6e50620d016add6dbbf5c"
+
 [[package]]
 name = "tokio"
 version = "1.17.0"
@@ -2093,6 +2177,21 @@ dependencies = [
  "version_check",
 ]
 
+[[package]]
+name = "unicode-bidi"
+version = "0.3.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a01404663e3db436ed2746d9fefef640d868edae3cceb81c3b8d5732fda678f"
+
+[[package]]
+name = "unicode-normalization"
+version = "0.1.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d54590932941a9e9266f0832deed84ebe1bf2e4c9e4a3554d393d18f5e854bf9"
+dependencies = [
+ "tinyvec",
+]
+
 [[package]]
 name = "unicode-xid"
 version = "0.2.2"
@@ -2105,6 +2204,61 @@ version = "0.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a156c684c91ea7d62626509bce3cb4e1d9ed5c4d978f7b4352658f96a4c26b4a"
 
+[[package]]
+name = "url"
+version = "2.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a507c383b2d33b5fc35d1861e77e6b383d158b2da5e14fe51b83dfedf6fd578c"
+dependencies = [
+ "form_urlencoded",
+ "idna",
+ "matches",
+ "percent-encoding",
+]
+
+[[package]]
+name = "validator"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6d0f08911ab0fee2c5009580f04615fa868898ee57de10692a45da0c3bcc3e5e"
+dependencies = [
+ "idna",
+ "lazy_static",
+ "regex",
+ "serde",
+ "serde_derive",
+ "serde_json",
+ "url",
+ "validator_derive",
+ "validator_types",
+]
+
+[[package]]
+name = "validator_derive"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d85135714dba11a1bd0b3eb1744169266f1a38977bf4e3ff5e2e1acb8c2b7eee"
+dependencies = [
+ "if_chain",
+ "lazy_static",
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "regex",
+ "syn",
+ "validator_types",
+]
+
+[[package]]
+name = "validator_types"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ded9d97e1d42327632f5f3bae6403c04886e2de3036261ef42deebd931a6a291"
+dependencies = [
+ "proc-macro2",
+ "syn",
+]
+
 [[package]]
 name = "valuable"
 version = "0.1.0"
diff --git a/backend/Cargo.toml b/backend/Cargo.toml
index a6ee3fa..319a427 100644
--- a/backend/Cargo.toml
+++ b/backend/Cargo.toml
@@ -20,4 +20,5 @@ argon2 = "0.4"
 rand_core = { version = "0.6", features = ["std"] }
 diesel-derive-enum = { version = "1.1", features = ["sqlite"] }
 jsonwebtoken = "8.1"
+validator = { version = "0.14", features = ["derive"] }
 
diff --git a/backend/requests/gamenights.sh b/backend/requests/gamenights.sh
old mode 100644
new mode 100755
diff --git a/backend/requests/login.sh b/backend/requests/login.sh
old mode 100644
new mode 100755
diff --git a/backend/requests/register.sh b/backend/requests/register.sh
old mode 100644
new mode 100755
index 3e1d7d3..689bfbd
--- a/backend/requests/register.sh
+++ b/backend/requests/register.sh
@@ -1 +1 @@
-curl -X POST -H "Content-Type: application/json" -d '{"username": "a", "email": "b", "password": "c", "password_repeat": "d"}' localhost:8000/api/register
+curl -X POST -H "Content-Type: application/json" -d '{"username": "roflin", "email": "user@example.com", "password": "oreokoekje123", "password_repeat": "oreokoekje123"}' localhost:8000/api/register
diff --git a/backend/src/api.rs b/backend/src/api.rs
index fbe1c4d..f655e06 100644
--- a/backend/src/api.rs
+++ b/backend/src/api.rs
@@ -1,3 +1,4 @@
+use validator::ValidateArgs;
 use crate::AppConfig;
 use rocket::request::Outcome;
 use jsonwebtoken::decode;
@@ -141,7 +142,17 @@ pub async fn gamenight_post_json(conn: DbConn, user: Option<schema::User>, gamen
 
 #[post("/register", format = "application/json", data = "<register_json>")]
 pub async fn register_post_json(conn: DbConn, register_json: Json<schema::Register>) -> ApiResponseVariant  {
-    match schema::insert_user(conn, register_json.into_inner()).await {
+
+    let register = register_json.into_inner();
+    let register_clone = register.clone();
+    match conn.run(move |c| {
+        register_clone.validate_args((c,c))
+    }).await {
+        Ok(()) => (),
+        Err(error) => return ApiResponseVariant::Value(json!(ApiResponse::error(error.to_string())))
+    }
+    
+    match schema::insert_user(conn, register).await {
         Ok(_) => ApiResponseVariant::Value(json!(ApiResponse::SUCCES)),
         Err(err) => ApiResponseVariant::Value(json!(ApiResponse::error(err.to_string())))
     }
diff --git a/backend/src/schema.rs b/backend/src/schema.rs
index 6ced9e9..6d5aaa3 100644
--- a/backend/src/schema.rs
+++ b/backend/src/schema.rs
@@ -1,3 +1,5 @@
+use diesel::dsl::count;
+use std::ops::Deref;
 use argon2::PasswordVerifier;
 use argon2::PasswordHash;
 use diesel_derive_enum::DbEnum;
@@ -17,10 +19,19 @@ use argon2::{
     Argon2
 };
 use argon2::password_hash::SaltString;
+use validator::{Validate, ValidationError};
 
 #[database("gamenight_database")]
 pub struct DbConn(diesel::SqliteConnection);
 
+impl Deref for DbConn {
+    type Target = rocket_sync_db_pools::Connection<DbConn, diesel::SqliteConnection>;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
 table! {
     gamenight (id) {
         id -> Integer,
@@ -183,6 +194,28 @@ pub async fn get_user(conn: DbConn, id: i32) -> User {
     }).await
 }
 
+pub fn unique_username(username: &String, conn: &diesel::SqliteConnection) -> Result<(), ValidationError> {    
+    match user::table
+        .select(count(user::username))
+        .filter(user::username.eq(username))
+        .execute(conn) {
+            Ok(0) => Ok(()),
+            Ok(_) => Err(ValidationError::new("User already exists")),
+            Err(_) => Err(ValidationError::new("Database error while validating user"))
+        }
+}
+
+pub fn unique_email(email: &String, conn: &diesel::SqliteConnection) -> Result<(), ValidationError> {
+    match user::table
+        .select(count(user::email))
+        .filter(user::email.eq(email))
+        .execute(conn) {
+            Ok(0) => Ok(()),
+            Ok(_) => Err(ValidationError::new("email already exists")),
+            Err(_) => Err(ValidationError::new("Database error while validating email"))
+        }
+}
+
 pub async fn run_migrations(rocket: Rocket<Build>) -> Rocket<Build> {
     // This macro from `diesel_migrations` defines an `embedded_migrations`
     // module containing a function named `run`. This allows the example to be
@@ -236,10 +269,13 @@ pub struct GameNight {
     pub datetime : String, 
 }
 
-#[derive(Serialize, Deserialize, Debug)]
+#[derive(Serialize, Deserialize, Debug, Validate, Clone)]
 pub struct Register {
+    #[validate(length(min = 1), custom( function = "unique_username", arg = "&'v_a diesel::SqliteConnection"))]
     pub username: String,
+    #[validate(email, custom( function = "unique_email", arg = "&'v_a diesel::SqliteConnection"))]
     pub email: String,
+    #[validate(length(min = 10), must_match = "password_repeat")]
     pub password: String,
     pub password_repeat: String,
 }