diff --git a/src/main/kotlin/fr/dcproject/common/validation/Password.kt b/src/main/kotlin/fr/dcproject/common/validation/Password.kt
index 3e6b0cb..b08bb7d 100644
--- a/src/main/kotlin/fr/dcproject/common/validation/Password.kt
+++ b/src/main/kotlin/fr/dcproject/common/validation/Password.kt
@@ -19,4 +19,4 @@ fun String.passwordScore(): Int {
     score += (hasAlphaLower + hasAlphaUpper + hasNum - 2) * 2
 
     return score
-}
\ No newline at end of file
+}
diff --git a/src/main/kotlin/fr/dcproject/component/auth/routes/Register.kt b/src/main/kotlin/fr/dcproject/component/auth/routes/Register.kt
index 08d1d67..0daa29a 100644
--- a/src/main/kotlin/fr/dcproject/component/auth/routes/Register.kt
+++ b/src/main/kotlin/fr/dcproject/component/auth/routes/Register.kt
@@ -1,7 +1,10 @@
 package fr.dcproject.component.auth.routes
 
 import com.fasterxml.jackson.module.kotlin.MissingKotlinParameterException
+import fr.dcproject.application.http.badRequestIfNotValid
 import fr.dcproject.common.utils.receiveOrBadRequest
+import fr.dcproject.common.validation.email
+import fr.dcproject.common.validation.passwordScore
 import fr.dcproject.component.auth.database.UserForCreate
 import fr.dcproject.component.auth.database.UserI
 import fr.dcproject.component.auth.jwt.makeToken
@@ -9,6 +12,9 @@ import fr.dcproject.component.auth.routes.Register.RegisterRequest.Input
 import fr.dcproject.component.citizen.database.CitizenForCreate
 import fr.dcproject.component.citizen.database.CitizenI
 import fr.dcproject.component.citizen.database.CitizenRepository
+import io.konform.validation.Validation
+import io.konform.validation.jsonschema.maxLength
+import io.konform.validation.jsonschema.minLength
 import io.ktor.application.call
 import io.ktor.features.BadRequestException
 import io.ktor.http.ContentType
@@ -43,6 +49,35 @@ object Register {
                 val username: String,
                 val password: String
             )
+
+            fun validate() = Validation<Input> {
+                Input::name {
+                    Name::firstName {
+                        minLength(2)
+                        maxLength(50)
+                    }
+                    Name::lastName {
+                        minLength(2)
+                        maxLength(50)
+                    }
+                    Name::civility ifPresent {
+                        minLength(1)
+                        maxLength(10)
+                    }
+                }
+                Input::user {
+                    User::username {
+                        minLength(7)
+                        maxLength(30)
+                    }
+                    User::password {
+                        passwordScore(15)
+                    }
+                }
+                Input::email {
+                    email()
+                }
+            }.validate(this)
         }
     }
 
@@ -62,7 +97,10 @@ object Register {
 
         post<RegisterRequest> {
             try {
-                val citizen = call.receiveOrBadRequest<Input>().toCitizen()
+                val citizen = call.receiveOrBadRequest<Input>()
+                    .apply { validate().badRequestIfNotValid() }
+                    .toCitizen()
+
                 citizenRepo.insertWithUser(citizen)?.user?.makeToken()?.let { token ->
                     if (call.request.accept() == ContentType.Application.Json.toString()) {
                         call.respond(
diff --git a/src/main/resources/openapi.yaml b/src/main/resources/openapi.yaml
index 17d5216..f1deaca 100644
--- a/src/main/resources/openapi.yaml
+++ b/src/main/resources/openapi.yaml
@@ -351,7 +351,7 @@ paths:
           content:
             application/json:
               schema:
-                description: sdf
+                $ref: '#/components/schemas/400'
   /auth/passwordless:
     post:
       summary: Send a connexion link by email
diff --git a/src/test/kotlin/integration/Register routes.kt b/src/test/kotlin/integration/Register routes.kt
index 52c4ae5..510d0b2 100644
--- a/src/test/kotlin/integration/Register routes.kt	
+++ b/src/test/kotlin/integration/Register routes.kt	
@@ -29,7 +29,7 @@ class `Register routes` : BaseTest() {
                       "birthday": "2001-01-01",
                       "user":{
                         "username": "george-junior",
-                        "password": "azerty"
+                        "password": "Azerty123!"
                       },
                       "email": "george-junior@gmail.com"
                     }