diff --git a/backend/controller/crud/crud.go b/backend/controller/crud/crud.go
index c85a9a5..ccbd99f 100644
--- a/backend/controller/crud/crud.go
+++ b/backend/controller/crud/crud.go
@@ -11,23 +11,41 @@ import (
 	"gitnet.fr/deblan/budget/database/manager"
 	"gorm.io/gorm"
 	"gorm.io/gorm/clause"
+
+	"github.com/go-playground/locales/fr"
+	ut "github.com/go-playground/universal-translator"
+	"github.com/go-playground/validator/v10"
+	fr_translations "github.com/go-playground/validator/v10/translations/fr"
 )
 
 type UpdateCallback func(*gorm.DB, interface{}, interface{}) (interface{}, error)
 type CreateCallback func(*gorm.DB, interface{}) (interface{}, error)
 
 type Error struct {
-	Code    int    `json:"code"`
-	Message string `json:"message"`
+	Code    int                                    `json:"code"`
+	Message string                                 `json:"message"`
+	Errors  validator.ValidationErrorsTranslations `json:"errors"`
 }
 
 type Controller struct {
-	Config Configuration
+	Config    Configuration
+	Validator *validator.Validate
+	Trans     ut.Translator
 }
 
 func New() *Controller {
 	c := Controller{}
 
+	fr := fr.New()
+	uni := ut.New(fr, fr)
+
+	trans, _ := uni.GetTranslator("fr")
+	validate := validator.New()
+	fr_translations.RegisterDefaultTranslations(validate, trans)
+
+	c.Validator = validate
+	c.Trans = trans
+
 	return &c
 }
 
@@ -155,10 +173,13 @@ func (ctrl *Controller) Create(c echo.Context, body interface{}, createCallback
 		})
 	}
 
-	if err := c.Validate(body); err != nil {
+	if err := ctrl.Validator.Struct(body); err != nil {
+		errs := err.(validator.ValidationErrors)
+
 		return c.JSON(400, Error{
 			Code:    400,
-			Message: err.Error(),
+			Message: message.InvalidForm,
+			Errors:  errs.Translate(ctrl.Trans),
 		})
 	}
 
@@ -211,10 +232,13 @@ func (ctrl *Controller) Update(c echo.Context, body interface{}, updateCallback
 		})
 	}
 
-	if err := c.Validate(body); err != nil {
+	if err := ctrl.Validator.Struct(body); err != nil {
+		errs := err.(validator.ValidationErrors)
+
 		return c.JSON(400, Error{
 			Code:    400,
-			Message: err.Error(),
+			Message: message.InvalidForm,
+			Errors:  errs.Translate(ctrl.Trans),
 		})
 	}
 
diff --git a/backend/controller/transaction/controller.go b/backend/controller/transaction/controller.go
index 93afafd..e1dfac2 100644
--- a/backend/controller/transaction/controller.go
+++ b/backend/controller/transaction/controller.go
@@ -5,6 +5,7 @@ import (
 	"io"
 	"strconv"
 
+	"github.com/go-playground/validator/v10"
 	"github.com/labstack/echo/v4"
 	"gitnet.fr/deblan/budget/backend/controller/crud"
 	"gitnet.fr/deblan/budget/backend/message"
@@ -86,7 +87,10 @@ func (ctrl *Controller) Create(c echo.Context) error {
 	if err != nil {
 		return c.JSON(400, crud.Error{
 			Code:    400,
-			Message: err.Error(),
+			Message: message.InvalidForm,
+			Errors: validator.ValidationErrorsTranslations{
+				"BankAccount": message.BlankBankAccount,
+			},
 		})
 	}
 
@@ -96,7 +100,10 @@ func (ctrl *Controller) Create(c echo.Context) error {
 	if count == 0 {
 		return c.JSON(400, crud.Error{
 			Code:    400,
-			Message: "Invalid bank account",
+			Message: message.InvalidForm,
+			Errors: validator.ValidationErrorsTranslations{
+				"BankAccount": message.UnknownBankAccount,
+			},
 		})
 	}
 
@@ -104,7 +111,10 @@ func (ctrl *Controller) Create(c echo.Context) error {
 	if err != nil {
 		return c.JSON(400, crud.Error{
 			Code:    400,
-			Message: err.Error(),
+			Message: message.InvalidForm,
+			Errors: validator.ValidationErrorsTranslations{
+				"File": message.BlankFile,
+			},
 		})
 	}
 
@@ -112,7 +122,10 @@ func (ctrl *Controller) Create(c echo.Context) error {
 	if err != nil {
 		return c.JSON(400, crud.Error{
 			Code:    400,
-			Message: err.Error(),
+			Message: message.InvalidForm,
+			Errors: validator.ValidationErrorsTranslations{
+				"File": message.UnproccessableFile,
+			},
 		})
 	}
 
@@ -126,7 +139,10 @@ func (ctrl *Controller) Create(c echo.Context) error {
 	if err != nil {
 		return c.JSON(400, crud.Error{
 			Code:    400,
-			Message: err.Error(),
+			Message: message.InvalidForm,
+			Errors: validator.ValidationErrorsTranslations{
+				"File": message.InvalidFile,
+			},
 		})
 	}
 
diff --git a/backend/message/message.go b/backend/message/message.go
index be386e1..600e379 100644
--- a/backend/message/message.go
+++ b/backend/message/message.go
@@ -1,8 +1,14 @@
 package message
 
 var (
-	LoginRequired = "Login required"
-	FileNotFound  = "File not found"
-	NotFound      = "Not found"
-	BadRequest    = "Bad request"
+	LoginRequired      = "Login required"
+	FileNotFound       = "File not found"
+	NotFound           = "Not found"
+	BadRequest         = "Bad request"
+	InvalidForm        = "Le formulaire n'est pas valide"
+	BlankBankAccount   = "Le compte bancaire n'est pas renseigné"
+	UnknownBankAccount = "Le compte bancaire n'existe pas"
+	BlankFile          = "Le fichier n'est pas renseigné"
+	UnproccessableFile = "Le fichier ne peut être traité"
+	InvalidFile        = "Le fichier n'est pas valide"
 )
diff --git a/frontend/js/lib/request.js b/frontend/js/lib/request.js
index aa509d5..e524447 100644
--- a/frontend/js/lib/request.js
+++ b/frontend/js/lib/request.js
@@ -21,4 +21,15 @@ const request = async (endpoint, options) => {
   return fetch(endpoint, createRequestOptions(options)).then((response) => response.json())
 }
 
-export { createRequestOptions, request, requestCallback }
+const requestErrorBuilder = (response) => {
+  let value = response.message
+  const errors = Object.values(response.errors ?? {})
+
+  if (errors.length) {
+    value += `<ul class="px-3 py-0 my-0 pt-1">${errors.map((e) => `<li class="m-0 p-0">${e}</li>`).join('')}</ul>`
+  }
+
+  return value
+}
+
+export { createRequestOptions, request, requestCallback, requestErrorBuilder }
diff --git a/frontend/js/models/saving_account.js b/frontend/js/models/saving_account.js
index 8ff3c9e..e3a2e46 100644
--- a/frontend/js/models/saving_account.js
+++ b/frontend/js/models/saving_account.js
@@ -56,10 +56,14 @@ const remove = async (id, callback, callbackError) => {
 const fixData = (data) => {
   if (data.blocked_amount) {
     data.blocked_amount = parseFloat(data.blocked_amount)
+  } else {
+    data.blocked_amount = 0.0
   }
 
   if (data.released_amount) {
     data.released_amount = parseFloat(data.released_amount)
+  } else {
+    data.released_amount = 0.0
   }
 
   return data
diff --git a/frontend/js/views/bank_account/CreateView.vue b/frontend/js/views/bank_account/CreateView.vue
index ed17cfd..a7b67b0 100644
--- a/frontend/js/views/bank_account/CreateView.vue
+++ b/frontend/js/views/bank_account/CreateView.vue
@@ -32,7 +32,7 @@
         variant="warning"
         :model-value="true"
       >
-        {{ form.error }}
+        <div v-html="form.error"></div>
       </BAlert>
       <BRow>
         <BCol>
@@ -51,6 +51,7 @@ import FormView from './../../components/crud/FormView.vue'
 import { ref, onMounted } from 'vue'
 import { useRouter } from 'vue-router'
 import { create, createForm } from '../../models/bank_account'
+import { requestErrorBuilder } from '../../lib/request'
 
 const router = useRouter()
 const form = ref(null)
@@ -60,7 +61,7 @@ const doSave = () => {
     form.value.data,
     (data) => {
       if (data.code === 400) {
-        form.value.error = data.message
+        form.value.error = requestErrorBuilder(data)
       } else {
         doBack()
       }
diff --git a/frontend/js/views/bank_account/EditView.vue b/frontend/js/views/bank_account/EditView.vue
index ef24794..1a1c60f 100644
--- a/frontend/js/views/bank_account/EditView.vue
+++ b/frontend/js/views/bank_account/EditView.vue
@@ -45,7 +45,7 @@
         variant="warning"
         :model-value="true"
       >
-        {{ form.error }}
+        <div v-html="form.error"></div>
       </BAlert>
       <BRow>
         <BCol>
@@ -63,6 +63,7 @@ import FormView from './../../components/crud/FormView.vue'
 import { ref, onMounted } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
 import { update, remove, getOne, createForm } from '../../models/bank_account'
+import { requestErrorBuilder } from '../../lib/request'
 
 const route = useRoute()
 const router = useRouter()
@@ -95,7 +96,7 @@ const doSave = () => {
     form.value.data,
     (data) => {
       if (data.code === 400) {
-        form.value.error = data.message
+        form.value.error = requestErrorBuilder(data)
       } else {
         doBack()
       }
diff --git a/frontend/js/views/category/CreateView.vue b/frontend/js/views/category/CreateView.vue
index f3b19f3..a6b57ac 100644
--- a/frontend/js/views/category/CreateView.vue
+++ b/frontend/js/views/category/CreateView.vue
@@ -32,7 +32,7 @@
         variant="warning"
         :model-value="true"
       >
-        {{ form.error }}
+        <div v-html="form.error"></div>
       </BAlert>
       <BRow>
         <BCol>
@@ -51,6 +51,7 @@ import FormView from './../../components/crud/FormView.vue'
 import { ref, onMounted } from 'vue'
 import { useRouter } from 'vue-router'
 import { create, createForm } from '../../models/category'
+import { requestErrorBuilder } from '../../lib/request'
 
 const router = useRouter()
 const form = ref(null)
@@ -60,7 +61,7 @@ const doSave = () => {
     form.value.data,
     (data) => {
       if (data.code === 400) {
-        form.value.error = data.message
+        form.value.error = requestErrorBuilder(data)
       } else {
         router.replace({ name: 'category_edit', params: { id: data.id } })
       }
diff --git a/frontend/js/views/category/EditView.vue b/frontend/js/views/category/EditView.vue
index bfec4e2..5bc3f9b 100644
--- a/frontend/js/views/category/EditView.vue
+++ b/frontend/js/views/category/EditView.vue
@@ -61,7 +61,7 @@
         variant="warning"
         :model-value="true"
       >
-        {{ form.error }}
+        <div v-html="form.error"></div>
       </BAlert>
       <BRow>
         <BCol
@@ -101,6 +101,7 @@ import { ref, onMounted } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
 import { update, remove, getOne, createForm } from '../../models/category'
 import { updateCategories, getOne as getTransactionOne } from '../../models/transaction'
+import { requestErrorBuilder } from '../../lib/request'
 
 const route = useRoute()
 const router = useRouter()
@@ -197,7 +198,7 @@ const doSave = () => {
     form.value.data,
     (data) => {
       if (data.code === 400) {
-        form.value.error = data.message
+        form.value.error = requestErrorBuilder(data)
       } else {
         form.value = null
         addTransaction = false
diff --git a/frontend/js/views/saving_account/CreateView.vue b/frontend/js/views/saving_account/CreateView.vue
index 1997349..482aad0 100644
--- a/frontend/js/views/saving_account/CreateView.vue
+++ b/frontend/js/views/saving_account/CreateView.vue
@@ -32,7 +32,7 @@
         variant="warning"
         :model-value="true"
       >
-        {{ form.error }}
+        <div v-html="form.error"></div>
       </BAlert>
       <BRow>
         <BCol>
@@ -51,6 +51,7 @@ import FormView from './../../components/crud/FormView.vue'
 import { ref, onMounted } from 'vue'
 import { useRouter } from 'vue-router'
 import { create, createForm } from '../../models/saving_account'
+import { requestErrorBuilder } from '../../lib/request'
 
 const router = useRouter()
 const form = ref(null)
@@ -60,7 +61,7 @@ const doSave = () => {
     form.value.data,
     (data) => {
       if (data.code === 400) {
-        form.value.error = data.message
+        form.value.error = requestErrorBuilder(data)
       } else {
         doBack()
       }
diff --git a/frontend/js/views/saving_account/EditView.vue b/frontend/js/views/saving_account/EditView.vue
index 0f04075..9b726d5 100644
--- a/frontend/js/views/saving_account/EditView.vue
+++ b/frontend/js/views/saving_account/EditView.vue
@@ -45,7 +45,7 @@
         variant="warning"
         :model-value="true"
       >
-        {{ form.error }}
+        <div v-html="form.error"></div>
       </BAlert>
       <BRow>
         <BCol>
@@ -63,6 +63,7 @@ import FormView from './../../components/crud/FormView.vue'
 import { ref, onMounted } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
 import { update, remove, getOne, createForm } from '../../models/saving_account'
+import { requestErrorBuilder } from '../../lib/request'
 
 const route = useRoute()
 const router = useRouter()
@@ -96,7 +97,7 @@ const doSave = () => {
     form.value.data,
     (data) => {
       if (data.code === 400) {
-        form.value.error = data.message
+        form.value.error = requestErrorBuilder(data)
       } else {
         doBack()
       }
diff --git a/frontend/js/views/transaction/ListView.vue b/frontend/js/views/transaction/ListView.vue
index 28d58c3..5c5d71e 100644
--- a/frontend/js/views/transaction/ListView.vue
+++ b/frontend/js/views/transaction/ListView.vue
@@ -54,8 +54,9 @@
       <BAlert
         :model-value="form.error !== null"
         variant="danger"
-        >{{ form.error }}</BAlert
-      >
+        >
+          <div v-html="form.error"></div>
+      </BAlert>
       <BForm @submit="doSave">
         <FormView :form="form" />
       </BForm>
@@ -107,6 +108,7 @@ import { useRouter, RouterView } from 'vue-router'
 import { getList, getListFields, getListFilters, createForm, importFile } from '../../models/transaction'
 import { getList as getAccountList } from '../../models/bank_account'
 import { getList as getCategoryList } from '../../models/category'
+import { requestErrorBuilder } from '../../lib/request'
 
 const endpoint = `/api/transaction`
 const order = ref(getStorage(`${endpoint}:order`))
@@ -183,7 +185,7 @@ const doSave = () => {
     form.value.data,
     (data) => {
       if (data.code === 400) {
-        form.value.error = data.message
+        form.value.error = requestErrorBuilder(data)
       } else {
         form.value = null
         formShow.value = false
diff --git a/frontend/js/views/user/CreateView.vue b/frontend/js/views/user/CreateView.vue
index f6e266c..cf6f801 100644
--- a/frontend/js/views/user/CreateView.vue
+++ b/frontend/js/views/user/CreateView.vue
@@ -26,6 +26,14 @@
       class="p-3"
       @submit="submit"
     >
+      <BAlert
+        v-if="form?.error"
+        dismissible
+        variant="warning"
+        :model-value="true"
+      >
+        <div v-html="form.error"></div>
+      </BAlert>
       <BRow>
         <BCol>
           <FormView :form="form" />
@@ -36,13 +44,13 @@
 </template>
 
 <script setup>
-import { BContainer, BButton, BForm, BRow, BCol } from 'bootstrap-vue-next'
-
+import { BContainer, BButton, BForm, BRow, BCol, BAlert } from 'bootstrap-vue-next'
 import CrudHeader from '../../components/crud/CrudHeader.vue'
 import FormView from '../../components/crud/FormView.vue'
 import { ref, onMounted } from 'vue'
 import { useRouter } from 'vue-router'
 import { create, createForm } from '../../models/user'
+import { requestErrorBuilder } from '../../lib/request'
 
 const router = useRouter()
 const parentRouteName = 'users'
@@ -53,7 +61,7 @@ const doSave = () => {
     form.value.data,
     (data) => {
       if (data.code === 400) {
-        form.value.error = data.message
+        form.value.error = requestErrorBuilder(data)
       } else {
         doBack()
       }
diff --git a/frontend/js/views/user/EditView.vue b/frontend/js/views/user/EditView.vue
index 7dbffd8..e8299ae 100644
--- a/frontend/js/views/user/EditView.vue
+++ b/frontend/js/views/user/EditView.vue
@@ -45,7 +45,7 @@
         variant="warning"
         :model-value="true"
       >
-        {{ form.error }}
+        <div v-html="form.error"></div>
       </BAlert>
       <BRow>
         <BCol>
@@ -63,6 +63,7 @@ import FormView from './../../components/crud/FormView.vue'
 import { ref, onMounted } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
 import { update, remove, getOne, createForm } from '../../models/user'
+import { requestErrorBuilder } from '../../lib/request'
 
 const route = useRoute()
 const router = useRouter()
@@ -96,7 +97,7 @@ const doSave = () => {
     form.value.data,
     (data) => {
       if (data.code === 400) {
-        form.value.error = data.message
+        form.value.error = requestErrorBuilder(data)
       } else {
         doBack()
       }