diff --git a/Sources/pom.xml b/Sources/pom.xml
index 9edef89..dd83b7a 100644
--- a/Sources/pom.xml
+++ b/Sources/pom.xml
@@ -37,12 +37,22 @@
             <artifactId>ktorm-core</artifactId>
             <version>3.2.0</version>
         </dependency>
+        <dependency>
+            <groupId>ch.qos.logback</groupId>
+            <artifactId>logback-classic</artifactId>
+            <version>${logback_version}</version>
+        </dependency>
         <dependency>
             <groupId>io.ktor</groupId>
             <artifactId>ktor-server-tests-jvm</artifactId>
             <version>${ktor_version}</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+            <version>${slf4j_version}</version>
+        </dependency>
         <dependency>
             <groupId>io.ktor</groupId>
             <artifactId>ktor-server-core</artifactId>
diff --git a/Sources/src/main/kotlin/allin/dto/UserDTO.kt b/Sources/src/main/kotlin/allin/dto/UserDTO.kt
new file mode 100644
index 0000000..d59f39c
--- /dev/null
+++ b/Sources/src/main/kotlin/allin/dto/UserDTO.kt
@@ -0,0 +1,15 @@
+package allin.dto
+
+import allin.model.User
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class UserDTO(val username: String,val email: String, val nbCoins: Int)
+@Serializable
+data class UserDTOWithToken(val username: String,val email: String, val nbCoins: Int, val token:String?)
+fun convertUserToUserDTO(user: User): UserDTO {
+    return UserDTO(user.username, user.email, user.nbCoins)
+}
+fun convertUserToUserDTOToken(user: User): UserDTOWithToken {
+    return UserDTOWithToken(user.username, user.email, user.nbCoins,user.token)
+}
diff --git a/Sources/src/main/kotlin/allin/routing/UserRouter.kt b/Sources/src/main/kotlin/allin/routing/UserRouter.kt
index 0630642..473de5e 100644
--- a/Sources/src/main/kotlin/allin/routing/UserRouter.kt
+++ b/Sources/src/main/kotlin/allin/routing/UserRouter.kt
@@ -1,5 +1,6 @@
 package allin.routing
 
+import allin.dto.*
 import allin.model.CheckUser
 import allin.model.User
 import com.typesafe.config.ConfigFactory
@@ -29,7 +30,7 @@ fun Application.UserRouter() {
                 val user = users.find { it.username == TempUser.username || it.email == TempUser.email }
                 if(user == null) {
                     users.add(TempUser)
-                    call.respond(HttpStatusCode.Created, TempUser)
+                    call.respond(HttpStatusCode.Created, convertUserToUserDTO(TempUser))
                 }
                 call.respond(HttpStatusCode.Conflict,"Mail or/and username already exist")
             }
@@ -40,8 +41,8 @@ fun Application.UserRouter() {
                 val checkUser = call.receive<CheckUser>()
                 val user = users.find { it.username == checkUser.login || it.email == checkUser.login }
                 if (user != null && user.password == checkUser.password) {
-                    user.token=tokenManager.generateJWTToken(user)
-                    call.respond(HttpStatusCode.OK, user)
+                    user.token=tokenManager.generateOrReplaceJWTToken(user)
+                    call.respond(HttpStatusCode.OK, convertUserToUserDTOToken(user))
                 } else {
                     call.respond(HttpStatusCode.NotFound,"Login and/or password incorrect.")
                 }
@@ -54,7 +55,7 @@ fun Application.UserRouter() {
                 val user = users.find { it.username == checkUser.login || it.email == checkUser.login }
                 if (user != null && user.password == checkUser.password) {
                     users.remove(user)
-                    call.respond(HttpStatusCode.Accepted, user)
+                    call.respond(HttpStatusCode.Accepted,convertUserToUserDTO(user))
                 } else {
                     call.respond(HttpStatusCode.NotFound,"Login and/or password incorrect.")
                 }
@@ -67,7 +68,7 @@ fun Application.UserRouter() {
                 val username = principal!!.payload.getClaim("username").asString()
                 val user = users.find { it.username == username }
                 if (user != null) {
-                    call.respond(HttpStatusCode.OK, user)
+                    call.respond(HttpStatusCode.OK,convertUserToUserDTO(user))
                 } else {
                     call.respond(HttpStatusCode.NotFound, "User not found with the valid token !")
                 }
diff --git a/Sources/src/main/kotlin/allin/utils/TokenManager.kt b/Sources/src/main/kotlin/allin/utils/TokenManager.kt
index 82999d2..5729406 100644
--- a/Sources/src/main/kotlin/allin/utils/TokenManager.kt
+++ b/Sources/src/main/kotlin/allin/utils/TokenManager.kt
@@ -12,8 +12,9 @@ class TokenManager (val config: HoconApplicationConfig){
     val audience=config.property("audience").getString()
     val secret=config.property("secret").getString()
     val issuer=config.property("issuer").getString()
-    val expirationDate = System.currentTimeMillis() + 60000
-    fun generateJWTToken(user : User): String {
+    private fun generateJWTToken(user : User): String {
+        val expirationDate = System.currentTimeMillis() + 604800000 // une semaine en miliseconde
+
         val token = JWT.create()
             .withAudience(audience)
             .withIssuer(issuer)
@@ -29,4 +30,22 @@ class TokenManager (val config: HoconApplicationConfig){
             .withIssuer(issuer)
             .build()
     }
+
+    fun generateOrReplaceJWTToken(user: User): String {
+        val userToken = getUserToken(user)
+        if (userToken != null && !isTokenExpired(userToken)) {
+            return userToken
+        } else {
+            return generateJWTToken(user)
+        }
+    }
+
+    private fun isTokenExpired(token: String): Boolean {
+        val expirationTime = JWT.decode(token).expiresAt.time
+        return System.currentTimeMillis() > expirationTime
+    }
+
+    private fun getUserToken(user: User): String? {
+        return user.token
+    }
 }
\ No newline at end of file