diff --git a/apps/app/src/components/event/RegistrationFieldFormDialog.vue b/apps/app/src/components/event/RegistrationFieldFormDialog.vue
index c22e29ac..e358fce5 100644
--- a/apps/app/src/components/event/RegistrationFieldFormDialog.vue
+++ b/apps/app/src/components/event/RegistrationFieldFormDialog.vue
@@ -2,8 +2,11 @@
 import { VForm } from 'vuetify/components/VForm'
 import { usePersonTagCategories } from '@/composables/api/usePersonTags'
 import { requiredValidator } from '@core/utils/validators'
-import type { RegistrationFormField } from '@/types/registration-form-field'
+import type { RegistrationFormField, RegistrationFormFieldCreateDTO } from '@/types/registration-form-field'
+import type { RegistrationFieldType } from '@/types/registration-field-template'
 import { FIELD_TYPE_LABELS, FIELD_TYPES_WITH_OPTIONS } from '@/types/registration-field-template'
+import type { AxiosError } from 'axios'
+import type { ApiErrorResponse } from '@/types/auth'
 
 const props = defineProps<{
   orgId: string
@@ -12,7 +15,7 @@ const props = defineProps<{
 }>()
 
 const emit = defineEmits<{
-  save: [payload: Record<string, any>]
+  save: [payload: Partial<RegistrationFormFieldCreateDTO>]
   'update:modelValue': [value: boolean]
 }>()
 
@@ -46,7 +49,7 @@ const dialogTitle = computed(() =>
 )
 
 const showOptions = computed(() =>
-  FIELD_TYPES_WITH_OPTIONS.includes(form.value.field_type as any),
+  (FIELD_TYPES_WITH_OPTIONS as readonly string[]).includes(form.value.field_type),
 )
 
 const showTagCategory = computed(() => form.value.field_type === 'tag_picker')
@@ -87,7 +90,7 @@ function onSubmit() {
     if (!valid) return
 
     errors.value = {}
-    const payload: Record<string, any> = {
+    const payload: Partial<RegistrationFormFieldCreateDTO> = {
       label: form.value.label,
       is_required: form.value.is_required,
       is_filterable: form.value.is_filterable,
@@ -98,7 +101,7 @@ function onSubmit() {
     }
 
     if (!props.field) {
-      payload.field_type = form.value.field_type
+      payload.field_type = form.value.field_type as RegistrationFieldType
     }
 
     if (showOptions.value) {
@@ -119,8 +122,8 @@ function onSubmit() {
   })
 }
 
-function setErrors(err: any) {
-  const data = err.response?.data
+function setErrors(err: Error) {
+  const data = (err as AxiosError<ApiErrorResponse>).response?.data
   if (data?.errors) {
     errors.value = Object.fromEntries(
       Object.entries(data.errors).map(([k, v]) => [k, (v as string[])[0]]),
diff --git a/apps/app/src/components/events/CreateEventDialog.vue b/apps/app/src/components/events/CreateEventDialog.vue
index 7622b052..76d62509 100644
--- a/apps/app/src/components/events/CreateEventDialog.vue
+++ b/apps/app/src/components/events/CreateEventDialog.vue
@@ -3,6 +3,8 @@ import { VForm } from 'vuetify/components/VForm'
 import { useCreateEvent } from '@/composables/api/useEvents'
 import { requiredValidator } from '@core/utils/validators'
 import type { EventTypeEnum } from '@/types/event'
+import type { AxiosError } from 'axios'
+import type { ApiErrorResponse } from '@/types/auth'
 
 const props = defineProps<{
   orgId: string
@@ -111,8 +113,8 @@ function onSubmit() {
         modelValue.value = false
         showSuccess.value = true
       },
-      onError: (err: any) => {
-        const data = err.response?.data
+      onError: (err: Error) => {
+        const data = (err as AxiosError<ApiErrorResponse>).response?.data
         if (data?.errors) {
           errors.value = Object.fromEntries(
             Object.entries(data.errors).map(([k, v]) => [k, (v as string[])[0]]),
diff --git a/apps/app/src/components/events/CreateSubEventDialog.vue b/apps/app/src/components/events/CreateSubEventDialog.vue
index 80e1af82..d179dcd0 100644
--- a/apps/app/src/components/events/CreateSubEventDialog.vue
+++ b/apps/app/src/components/events/CreateSubEventDialog.vue
@@ -3,6 +3,8 @@ import { VForm } from 'vuetify/components/VForm'
 import { useCreateSubEvent } from '@/composables/api/useEvents'
 import { requiredValidator } from '@core/utils/validators'
 import type { EventItem, EventStatus } from '@/types/event'
+import type { AxiosError } from 'axios'
+import type { ApiErrorResponse } from '@/types/auth'
 
 const props = defineProps<{
   parentEvent: EventItem
@@ -74,8 +76,8 @@ function onSubmit() {
         modelValue.value = false
         showSuccess.value = true
       },
-      onError: (err: any) => {
-        const data = err.response?.data
+      onError: (err: Error) => {
+        const data = (err as AxiosError<ApiErrorResponse>).response?.data
         if (data?.errors) {
           errors.value = Object.fromEntries(
             Object.entries(data.errors).map(([k, v]) => [k, (v as string[])[0]]),
diff --git a/apps/app/src/components/events/EditEventDialog.vue b/apps/app/src/components/events/EditEventDialog.vue
index 9e9e93ac..33158189 100644
--- a/apps/app/src/components/events/EditEventDialog.vue
+++ b/apps/app/src/components/events/EditEventDialog.vue
@@ -3,6 +3,8 @@ import { VForm } from 'vuetify/components/VForm'
 import { useUpdateEvent } from '@/composables/api/useEvents'
 import { requiredValidator } from '@core/utils/validators'
 import type { EventItem } from '@/types/event'
+import type { AxiosError } from 'axios'
+import type { ApiErrorResponse } from '@/types/auth'
 
 const props = defineProps<{
   event: EventItem
@@ -97,8 +99,8 @@ function onSubmit() {
         modelValue.value = false
         showSuccess.value = true
       },
-      onError: (err: any) => {
-        const data = err.response?.data
+      onError: (err: Error) => {
+        const data = (err as AxiosError<ApiErrorResponse>).response?.data
         if (data?.errors) {
           errors.value = Object.fromEntries(
             Object.entries(data.errors).map(([k, v]) => [k, (v as string[])[0]]),
diff --git a/apps/app/src/components/members/EditMemberRoleDialog.vue b/apps/app/src/components/members/EditMemberRoleDialog.vue
index a963a6f2..850181f4 100644
--- a/apps/app/src/components/members/EditMemberRoleDialog.vue
+++ b/apps/app/src/components/members/EditMemberRoleDialog.vue
@@ -4,6 +4,8 @@ import { useUpdateMemberRole } from '@/composables/api/useMembers'
 import { useAuthStore } from '@/stores/useAuthStore'
 import { requiredValidator } from '@core/utils/validators'
 import type { Member, OrganisationRole } from '@/types/member'
+import type { AxiosError } from 'axios'
+import type { ApiErrorResponse } from '@/types/auth'
 
 const props = defineProps<{
   orgId: string
@@ -51,8 +53,8 @@ function onSubmit() {
           modelValue.value = false
           showSuccess.value = true
         },
-        onError: (err: any) => {
-          const data = err.response?.data
+        onError: (err: Error) => {
+          const data = (err as AxiosError<ApiErrorResponse>).response?.data
           if (data?.errors) {
             errors.value = { role: data.errors.role?.[0] ?? '' }
           }
diff --git a/apps/app/src/components/members/InviteMemberDialog.vue b/apps/app/src/components/members/InviteMemberDialog.vue
index 6d897ae7..1d4f2a1e 100644
--- a/apps/app/src/components/members/InviteMemberDialog.vue
+++ b/apps/app/src/components/members/InviteMemberDialog.vue
@@ -3,6 +3,8 @@ import { VForm } from 'vuetify/components/VForm'
 import { useInviteMember } from '@/composables/api/useMembers'
 import { emailValidator, requiredValidator } from '@core/utils/validators'
 import type { OrganisationRole } from '@/types/member'
+import type { AxiosError } from 'axios'
+import type { ApiErrorResponse } from '@/types/auth'
 
 const props = defineProps<{
   orgId: string
@@ -50,8 +52,8 @@ function onSubmit() {
           modelValue.value = false
           showSuccess.value = true
         },
-        onError: (err: any) => {
-          const data = err.response?.data
+        onError: (err: Error) => {
+          const data = (err as AxiosError<ApiErrorResponse>).response?.data
           if (data?.errors) {
             errors.value = {
               email: data.errors.email?.[0] ?? '',
diff --git a/apps/app/src/components/organisation/CompanyDialog.vue b/apps/app/src/components/organisation/CompanyDialog.vue
index 9fb41a3f..64e29844 100644
--- a/apps/app/src/components/organisation/CompanyDialog.vue
+++ b/apps/app/src/components/organisation/CompanyDialog.vue
@@ -3,6 +3,8 @@ import { VForm } from 'vuetify/components/VForm'
 import { useCreateCompany, useUpdateCompany } from '@/composables/api/useCompanies'
 import { requiredValidator, emailValidator } from '@core/utils/validators'
 import type { Company } from '@/types/organisation'
+import type { AxiosError } from 'axios'
+import type { ApiErrorResponse } from '@/types/auth'
 
 const props = defineProps<{
   orgId: string
@@ -90,8 +92,8 @@ function onSubmit() {
       emit('saved')
     }
 
-    const onError = (err: any) => {
-      const data = err.response?.data
+    const onError = (err: Error) => {
+      const data = (err as AxiosError<ApiErrorResponse>).response?.data
       if (data?.errors) {
         errors.value = Object.fromEntries(
           Object.entries(data.errors).map(([k, v]) => [k, (v as string[])[0]]),
diff --git a/apps/app/src/components/organisation/EmailBrandingTab.vue b/apps/app/src/components/organisation/EmailBrandingTab.vue
index bb4845eb..d8ed162f 100644
--- a/apps/app/src/components/organisation/EmailBrandingTab.vue
+++ b/apps/app/src/components/organisation/EmailBrandingTab.vue
@@ -2,6 +2,8 @@
 import { VForm } from 'vuetify/components/VForm'
 import { useEmailSettings, useUpdateEmailSettings } from '@/composables/api/useEmail'
 import { emailValidator } from '@core/utils/validators'
+import type { AxiosError } from 'axios'
+import type { ApiErrorResponse } from '@/types/auth'
 
 const props = defineProps<{
   orgId: string
@@ -68,9 +70,10 @@ async function onSubmit() {
     onSuccess: () => {
       snackbar.value = true
     },
-    onError: (error: any) => {
-      if (error.response?.status === 422 && error.response?.data?.errors) {
-        serverErrors.value = error.response.data.errors
+    onError: (error: Error) => {
+      const axiosError = error as AxiosError<ApiErrorResponse>
+      if (axiosError.response?.status === 422 && axiosError.response?.data?.errors) {
+        serverErrors.value = axiosError.response.data.errors
       }
     },
   })
diff --git a/apps/app/src/components/organisation/EmailTemplatesTab.vue b/apps/app/src/components/organisation/EmailTemplatesTab.vue
index 12cd44c2..4e484d52 100644
--- a/apps/app/src/components/organisation/EmailTemplatesTab.vue
+++ b/apps/app/src/components/organisation/EmailTemplatesTab.vue
@@ -11,6 +11,8 @@ import { useAuthStore } from '@/stores/useAuthStore'
 import { TEMPLATE_VARIABLES } from '@/types/email'
 import type { EmailTemplate, UpdateEmailTemplatePayload } from '@/types/email'
 import { emailValidator, requiredValidator } from '@core/utils/validators'
+import type { AxiosError } from 'axios'
+import type { ApiErrorResponse } from '@/types/auth'
 
 const props = defineProps<{
   orgId: string
@@ -89,9 +91,10 @@ function onEditSubmit() {
         snackbarMessage.value = 'Template opgeslagen'
         snackbar.value = true
       },
-      onError: (error: any) => {
-        if (error.response?.status === 422 && error.response?.data?.errors) {
-          editErrors.value = error.response.data.errors
+      onError: (error: Error) => {
+        const axiosError = error as AxiosError<ApiErrorResponse>
+        if (axiosError.response?.status === 422 && axiosError.response?.data?.errors) {
+          editErrors.value = axiosError.response.data.errors
         }
       },
     })
diff --git a/apps/app/src/components/organisation/PersonTagsTab.vue b/apps/app/src/components/organisation/PersonTagsTab.vue
index cc01afcc..bc6326ee 100644
--- a/apps/app/src/components/organisation/PersonTagsTab.vue
+++ b/apps/app/src/components/organisation/PersonTagsTab.vue
@@ -9,6 +9,8 @@ import {
 } from '@/composables/api/usePersonTags'
 import { requiredValidator } from '@core/utils/validators'
 import type { PersonTag } from '@/types/person-tag'
+import type { AxiosError } from 'axios'
+import type { ApiErrorResponse } from '@/types/auth'
 
 const props = defineProps<{
   orgId: string
@@ -139,8 +141,8 @@ function onSubmit() {
   })
 }
 
-function handleError(err: any) {
-  const data = err.response?.data
+function handleError(err: Error) {
+  const data = (err as AxiosError<ApiErrorResponse>).response?.data
   if (data?.errors) {
     errors.value = Object.fromEntries(
       Object.entries(data.errors).map(([k, v]) => [k, (v as string[])[0]]),
diff --git a/apps/app/src/components/organisation/RegistrationFieldTemplatesTab.vue b/apps/app/src/components/organisation/RegistrationFieldTemplatesTab.vue
index 70b08342..875ec29a 100644
--- a/apps/app/src/components/organisation/RegistrationFieldTemplatesTab.vue
+++ b/apps/app/src/components/organisation/RegistrationFieldTemplatesTab.vue
@@ -8,8 +8,10 @@ import {
 } from '@/composables/api/useRegistrationFieldTemplates'
 import { usePersonTagCategories } from '@/composables/api/usePersonTags'
 import { requiredValidator } from '@core/utils/validators'
-import type { RegistrationFieldTemplate } from '@/types/registration-field-template'
+import type { RegistrationFieldTemplate, RegistrationFieldTemplateCreateDTO, RegistrationFieldType } from '@/types/registration-field-template'
 import { FIELD_TYPE_LABELS, FIELD_TYPES_WITH_OPTIONS } from '@/types/registration-field-template'
+import type { AxiosError } from 'axios'
+import type { ApiErrorResponse } from '@/types/auth'
 
 const props = defineProps<{
   orgId: string
@@ -67,7 +69,7 @@ const dialogTitle = computed(() =>
 const isSaving = computed(() => isCreating.value || isUpdating.value)
 
 const showOptions = computed(() =>
-  FIELD_TYPES_WITH_OPTIONS.includes(form.value.field_type as any),
+  (FIELD_TYPES_WITH_OPTIONS as readonly string[]).includes(form.value.field_type),
 )
 
 const showTagCategory = computed(() => form.value.field_type === 'tag_picker')
@@ -115,7 +117,7 @@ function onSubmit() {
     if (!valid) return
 
     errors.value = {}
-    const payload: Record<string, any> = {
+    const payload: Partial<RegistrationFieldTemplateCreateDTO> = {
       label: form.value.label,
       is_required: form.value.is_required,
       is_filterable: form.value.is_filterable,
@@ -127,7 +129,7 @@ function onSubmit() {
     }
 
     if (!editingTemplate.value) {
-      payload.field_type = form.value.field_type
+      payload.field_type = form.value.field_type as RegistrationFieldType
     }
 
     if (showOptions.value) {
@@ -155,7 +157,7 @@ function onSubmit() {
       )
     }
     else {
-      createTemplate(payload as any, {
+      createTemplate(payload as RegistrationFieldTemplateCreateDTO, {
         onSuccess: () => {
           isDialogOpen.value = false
           successMessage.value = `${form.value.label} aangemaakt`
@@ -167,8 +169,8 @@ function onSubmit() {
   })
 }
 
-function handleError(err: any) {
-  const data = err.response?.data
+function handleError(err: Error) {
+  const data = (err as AxiosError<ApiErrorResponse>).response?.data
   if (data?.errors) {
     errors.value = Object.fromEntries(
       Object.entries(data.errors).map(([k, v]) => [k, (v as string[])[0]]),
diff --git a/apps/app/src/components/organisations/CrowdTypesManager.vue b/apps/app/src/components/organisations/CrowdTypesManager.vue
index 1562fca7..bae61496 100644
--- a/apps/app/src/components/organisations/CrowdTypesManager.vue
+++ b/apps/app/src/components/organisations/CrowdTypesManager.vue
@@ -3,6 +3,8 @@ import { VForm } from 'vuetify/components/VForm'
 import { useCrowdTypeList, useCreateCrowdType, useUpdateCrowdType, useDeleteCrowdType } from '@/composables/api/useCrowdTypes'
 import { requiredValidator } from '@core/utils/validators'
 import type { CrowdType } from '@/types/organisation'
+import type { AxiosError } from 'axios'
+import type { ApiErrorResponse } from '@/types/auth'
 
 const props = defineProps<{
   orgId: string
@@ -128,8 +130,8 @@ function onSubmit() {
   })
 }
 
-function handleError(err: any) {
-  const data = err.response?.data
+function handleError(err: Error) {
+  const data = (err as AxiosError<ApiErrorResponse>).response?.data
   if (data?.errors) {
     errors.value = Object.fromEntries(
       Object.entries(data.errors).map(([k, v]) => [k, (v as string[])[0]]),
diff --git a/apps/app/src/components/organisations/EditOrganisationDialog.vue b/apps/app/src/components/organisations/EditOrganisationDialog.vue
index eab6a925..aa474093 100644
--- a/apps/app/src/components/organisations/EditOrganisationDialog.vue
+++ b/apps/app/src/components/organisations/EditOrganisationDialog.vue
@@ -3,6 +3,8 @@ import { VForm } from 'vuetify/components/VForm'
 import { useUpdateOrganisation } from '@/composables/api/useOrganisations'
 import { requiredValidator } from '@core/utils/validators'
 import type { Organisation } from '@/types/organisation'
+import type { AxiosError } from 'axios'
+import type { ApiErrorResponse } from '@/types/auth'
 
 const props = defineProps<{
   organisation: Organisation
@@ -34,8 +36,8 @@ function onSubmit() {
           modelValue.value = false
           showSuccess.value = true
         },
-        onError: (err: any) => {
-          const data = err.response?.data
+        onError: (err: Error) => {
+          const data = (err as AxiosError<ApiErrorResponse>).response?.data
           if (data?.errors) {
             errors.value = { name: data.errors.name?.[0] ?? '' }
           }
diff --git a/apps/app/src/components/persons/CreatePersonDialog.vue b/apps/app/src/components/persons/CreatePersonDialog.vue
index 425aa4ea..c71c7e35 100644
--- a/apps/app/src/components/persons/CreatePersonDialog.vue
+++ b/apps/app/src/components/persons/CreatePersonDialog.vue
@@ -5,6 +5,8 @@ import { useCrowdTypeList } from '@/composables/api/useCrowdTypes'
 import { useCompanies } from '@/composables/api/useCompanies'
 import { requiredValidator, emailValidator } from '@core/utils/validators'
 import type { PersonStatus } from '@/types/person'
+import type { AxiosError } from 'axios'
+import type { ApiErrorResponse } from '@/types/auth'
 
 const props = defineProps<{
   eventId: string
@@ -106,11 +108,11 @@ function onSubmit() {
         modelValue.value = false
         showSuccess.value = true
       },
-      onError: (err: any) => {
-        const data = err.response?.data
+      onError: (err: Error) => {
+        const data = (err as AxiosError<ApiErrorResponse>).response?.data
         if (data?.errors) {
           errors.value = Object.fromEntries(
-            Object.entries(data.errors).map(([k, v]) => [k, (v as string[])[0]]),
+            Object.entries(data.errors).map(([k, v]) => [k, v[0]]),
           )
         }
         else if (data?.message) {
diff --git a/apps/app/src/components/persons/EditPersonDialog.vue b/apps/app/src/components/persons/EditPersonDialog.vue
index adb67363..2cf37dab 100644
--- a/apps/app/src/components/persons/EditPersonDialog.vue
+++ b/apps/app/src/components/persons/EditPersonDialog.vue
@@ -5,6 +5,8 @@ import { useCrowdTypeList } from '@/composables/api/useCrowdTypes'
 import { useCompanies } from '@/composables/api/useCompanies'
 import { requiredValidator, emailValidator } from '@core/utils/validators'
 import type { Person, PersonStatus } from '@/types/person'
+import type { AxiosError } from 'axios'
+import type { ApiErrorResponse } from '@/types/auth'
 
 const props = defineProps<{
   person: Person
@@ -110,11 +112,11 @@ function onSubmit() {
         modelValue.value = false
         showSuccess.value = true
       },
-      onError: (err: any) => {
-        const data = err.response?.data
+      onError: (err: Error) => {
+        const data = (err as AxiosError<ApiErrorResponse>).response?.data
         if (data?.errors) {
           errors.value = Object.fromEntries(
-            Object.entries(data.errors).map(([k, v]) => [k, (v as string[])[0]]),
+            Object.entries(data.errors).map(([k, v]) => [k, v[0]]),
           )
         }
         else if (data?.message) {
diff --git a/apps/app/src/components/sections/AssignShiftDialog.vue b/apps/app/src/components/sections/AssignShiftDialog.vue
index 5e6565fd..dda33dc9 100644
--- a/apps/app/src/components/sections/AssignShiftDialog.vue
+++ b/apps/app/src/components/sections/AssignShiftDialog.vue
@@ -4,6 +4,8 @@ import { usePersonList } from '@/composables/api/usePersons'
 import { useAuthStore } from '@/stores/useAuthStore'
 import type { Shift } from '@/types/section'
 import type { Person } from '@/types/person'
+import type { AxiosError } from 'axios'
+import type { ApiErrorResponse } from '@/types/auth'
 
 const props = defineProps<{
   eventId: string
@@ -66,8 +68,8 @@ function onSubmit() {
         modelValue.value = false
         selectedPersonId.value = ''
       },
-      onError: (err: any) => {
-        const data = err.response?.data
+      onError: (err: Error) => {
+        const data = (err as AxiosError<ApiErrorResponse>).response?.data
         if (data?.errors) {
           errors.value = Object.fromEntries(
             Object.entries(data.errors).map(([k, v]) => [k, (v as string[])[0]]),
diff --git a/apps/app/src/components/sections/CreateSectionDialog.vue b/apps/app/src/components/sections/CreateSectionDialog.vue
index 38b234c1..36249b37 100644
--- a/apps/app/src/components/sections/CreateSectionDialog.vue
+++ b/apps/app/src/components/sections/CreateSectionDialog.vue
@@ -4,6 +4,8 @@ import { useCreateSection, useSectionCategories } from '@/composables/api/useSec
 import { useAuthStore } from '@/stores/useAuthStore'
 import { requiredValidator } from '@core/utils/validators'
 import type { SectionType } from '@/types/section'
+import type { AxiosError } from 'axios'
+import type { ApiErrorResponse } from '@/types/auth'
 
 const props = withDefaults(defineProps<{
   eventId: string
@@ -92,8 +94,8 @@ function onSubmit() {
             parentEventName: result.parentEventName,
           })
         },
-        onError: (err: any) => {
-          const data = err.response?.data
+        onError: (err: Error) => {
+          const data = (err as AxiosError<ApiErrorResponse>).response?.data
           if (data?.errors) {
             errors.value = Object.fromEntries(
               Object.entries(data.errors).map(([k, v]) => [k, (v as string[])[0]]),
diff --git a/apps/app/src/components/sections/CreateShiftDialog.vue b/apps/app/src/components/sections/CreateShiftDialog.vue
index 59b6274f..583361d6 100644
--- a/apps/app/src/components/sections/CreateShiftDialog.vue
+++ b/apps/app/src/components/sections/CreateShiftDialog.vue
@@ -7,6 +7,8 @@ import { useAuthStore } from '@/stores/useAuthStore'
 import { useTimeSlotDropdown } from '@/composables/useTimeSlotDropdown'
 import { requiredValidator } from '@core/utils/validators'
 import type { FestivalSection, Shift, ShiftStatus } from '@/types/section'
+import type { AxiosError } from 'axios'
+import type { ApiErrorResponse } from '@/types/auth'
 
 const props = withDefaults(defineProps<{
   eventId: string
@@ -184,8 +186,8 @@ function onSubmit() {
       onSuccess: () => {
         modelValue.value = false
       },
-      onError: (err: any) => {
-        const data = err.response?.data
+      onError: (err: Error) => {
+        const data = (err as AxiosError<ApiErrorResponse>).response?.data
         if (data?.errors) {
           errors.value = Object.fromEntries(
             Object.entries(data.errors).map(([k, v]) => [k, (v as string[])[0]]),
diff --git a/apps/app/src/components/sections/CreateTimeSlotDialog.vue b/apps/app/src/components/sections/CreateTimeSlotDialog.vue
index 615b9dd9..d4b89335 100644
--- a/apps/app/src/components/sections/CreateTimeSlotDialog.vue
+++ b/apps/app/src/components/sections/CreateTimeSlotDialog.vue
@@ -4,6 +4,8 @@ import { useCreateTimeSlot, useUpdateTimeSlot } from '@/composables/api/useTimeS
 import { useAuthStore } from '@/stores/useAuthStore'
 import { requiredValidator } from '@core/utils/validators'
 import type { TimeSlot } from '@/types/section'
+import type { AxiosError } from 'axios'
+import type { ApiErrorResponse } from '@/types/auth'
 
 const props = defineProps<{
   eventId: string
@@ -127,8 +129,8 @@ function onSubmit() {
       onSuccess: () => {
         modelValue.value = false
       },
-      onError: (err: any) => {
-        const data = err.response?.data
+      onError: (err: Error) => {
+        const data = (err as AxiosError<ApiErrorResponse>).response?.data
         if (data?.errors) {
           errors.value = Object.fromEntries(
             Object.entries(data.errors).map(([k, v]) => [k, (v as string[])[0]]),
diff --git a/apps/app/src/components/sections/EditSectionDialog.vue b/apps/app/src/components/sections/EditSectionDialog.vue
index 5ddec8e1..ea8023d2 100644
--- a/apps/app/src/components/sections/EditSectionDialog.vue
+++ b/apps/app/src/components/sections/EditSectionDialog.vue
@@ -4,6 +4,8 @@ import { useUpdateSection, useSectionCategories } from '@/composables/api/useSec
 import { useAuthStore } from '@/stores/useAuthStore'
 import { requiredValidator } from '@core/utils/validators'
 import type { FestivalSection, SectionType } from '@/types/section'
+import type { AxiosError } from 'axios'
+import type { ApiErrorResponse } from '@/types/auth'
 
 const props = defineProps<{
   eventId: string
@@ -91,8 +93,8 @@ function onSubmit() {
           modelValue.value = false
           emit('updated')
         },
-        onError: (err: any) => {
-          const data = err.response?.data
+        onError: (err: Error) => {
+          const data = (err as AxiosError<ApiErrorResponse>).response?.data
           if (data?.errors) {
             errors.value = Object.fromEntries(
               Object.entries(data.errors).map(([k, v]) => [k, (v as string[])[0]]),
diff --git a/apps/app/src/pages/events/[id]/settings/index.vue b/apps/app/src/pages/events/[id]/settings/index.vue
index beabb864..377198c0 100644
--- a/apps/app/src/pages/events/[id]/settings/index.vue
+++ b/apps/app/src/pages/events/[id]/settings/index.vue
@@ -3,7 +3,7 @@ import { VForm } from 'vuetify/components/VForm'
 import EventTabsNav from '@/components/events/EventTabsNav.vue'
 import { useUpdateEvent, useUploadEventImage } from '@/composables/api/useEvents'
 import { useAuthStore } from '@/stores/useAuthStore'
-import type { EventItem } from '@/types/event'
+import type { EventItem, UpdateEventPayload } from '@/types/event'
 
 definePage({
   meta: {
@@ -55,7 +55,7 @@ function onFileSelected(files: File[], type: 'banner' | 'logo') {
 function onClearImage(event: EventItem, type: 'banner' | 'logo') {
   const field = type === 'banner' ? 'registration_banner_url' : 'registration_logo_url'
 
-  updateEvent({ [field]: null } as any)
+  updateEvent({ [field]: null } as UpdateEventPayload)
 }
 </script>
 
diff --git a/apps/app/src/pages/events/[id]/settings/registration-fields.vue b/apps/app/src/pages/events/[id]/settings/registration-fields.vue
index 5112d708..28dc3e99 100644
--- a/apps/app/src/pages/events/[id]/settings/registration-fields.vue
+++ b/apps/app/src/pages/events/[id]/settings/registration-fields.vue
@@ -15,7 +15,7 @@ import {
 } from '@/composables/api/useRegistrationFormFields'
 import { useAuthStore } from '@/stores/useAuthStore'
 import { useNotificationStore } from '@/stores/useNotificationStore'
-import type { RegistrationFormField } from '@/types/registration-form-field'
+import type { RegistrationFormField, RegistrationFormFieldCreateDTO } from '@/types/registration-form-field'
 import type { EventItem } from '@/types/event'
 
 definePage({
@@ -97,7 +97,7 @@ function openEditDialog(field: RegistrationFormField) {
   isFieldDialogOpen.value = true
 }
 
-function onSaveField(payload: Record<string, any>) {
+function onSaveField(payload: Partial<RegistrationFormFieldCreateDTO>) {
   if (editingField.value) {
     updateField(
       { id: editingField.value.id, ...payload },
@@ -111,7 +111,7 @@ function onSaveField(payload: Record<string, any>) {
     )
   }
   else {
-    createField(payload as any, {
+    createField(payload as RegistrationFormFieldCreateDTO, {
       onSuccess: () => {
         isFieldDialogOpen.value = false
         notificationStore.show(`${payload.label} aangemaakt`, 'success')
diff --git a/apps/app/src/pages/invitations/[token].vue b/apps/app/src/pages/invitations/[token].vue
index 6fcfc506..55e1fa9c 100644
--- a/apps/app/src/pages/invitations/[token].vue
+++ b/apps/app/src/pages/invitations/[token].vue
@@ -6,6 +6,8 @@ import { requiredValidator } from '@core/utils/validators'
 import { VNodeRenderer } from '@layouts/components/VNodeRenderer'
 import { themeConfig } from '@themeConfig'
 import type { OrganisationRole } from '@/types/member'
+import type { AxiosError } from 'axios'
+import type { ApiErrorResponse } from '@/types/auth'
 
 definePage({
   meta: {
@@ -68,8 +70,8 @@ function onSubmit() {
           authStore.setUser(response.data.user)
           router.replace('/dashboard')
         },
-        onError: (err: any) => {
-          const data = err.response?.data
+        onError: (err: Error) => {
+          const data = (err as AxiosError<ApiErrorResponse>).response?.data
           if (data?.errors) {
             errors.value = {
               name: data.errors.name?.[0] ?? '',
diff --git a/apps/app/src/types/event.ts b/apps/app/src/types/event.ts
index 27019d6e..ac843317 100644
--- a/apps/app/src/types/event.ts
+++ b/apps/app/src/types/event.ts
@@ -54,6 +54,8 @@ export interface CreateEventPayload {
 
 export interface UpdateEventPayload extends Partial<CreateEventPayload> {
   status?: EventStatus
+  registration_banner_url?: string | null
+  registration_logo_url?: string | null
   registration_welcome_text?: string | null
   registration_show_section_preferences?: boolean
   registration_show_availability?: boolean
diff --git a/apps/portal/src/components/event/ClaimenTab.vue b/apps/portal/src/components/event/ClaimenTab.vue
index 6f0cfe2a..806e255f 100644
--- a/apps/portal/src/components/event/ClaimenTab.vue
+++ b/apps/portal/src/components/event/ClaimenTab.vue
@@ -1,6 +1,8 @@
 <script setup lang="ts">
 import { useAvailableShifts, useClaimShift } from '@/composables/api/usePortalShifts'
 import type { AvailableShift } from '@/types/portal-shift'
+import axios from 'axios'
+import type { ApiErrorResponse } from '@/types/api'
 
 const props = defineProps<{
   eventId: string
@@ -45,9 +47,10 @@ async function confirmClaim() {
     snackbarColor.value = 'success'
     snackbar.value = true
   }
-  catch (err: any) {
-    const message = err?.response?.data?.message ?? 'Er is een fout opgetreden.'
-    claimError.value = message
+  catch (err: unknown) {
+    claimError.value = axios.isAxiosError<ApiErrorResponse>(err)
+      ? err.response?.data?.message ?? 'Er is een fout opgetreden.'
+      : 'Er is een fout opgetreden.'
   }
 }
 
diff --git a/apps/portal/src/components/event/RoosterTab.vue b/apps/portal/src/components/event/RoosterTab.vue
index 95dcc982..c011ceaf 100644
--- a/apps/portal/src/components/event/RoosterTab.vue
+++ b/apps/portal/src/components/event/RoosterTab.vue
@@ -1,6 +1,8 @@
 <script setup lang="ts">
 import { useMyShifts, useCancelAssignment } from '@/composables/api/usePortalShifts'
 import type { MyShiftAssignment } from '@/types/portal-shift'
+import axios from 'axios'
+import type { ApiErrorResponse } from '@/types/api'
 
 const props = defineProps<{
   eventId: string
@@ -51,8 +53,10 @@ async function confirmCancel() {
     snackbarMessage.value = result.message
     snackbar.value = true
   }
-  catch (err: any) {
-    cancelError.value = err?.response?.data?.message ?? 'Er is een fout opgetreden.'
+  catch (err: unknown) {
+    cancelError.value = axios.isAxiosError<ApiErrorResponse>(err)
+      ? err.response?.data?.message ?? 'Er is een fout opgetreden.'
+      : 'Er is een fout opgetreden.'
   }
 }
 </script>
diff --git a/apps/portal/src/layouts/portal.vue b/apps/portal/src/layouts/portal.vue
index 9d071133..fcc92bfd 100644
--- a/apps/portal/src/layouts/portal.vue
+++ b/apps/portal/src/layouts/portal.vue
@@ -16,7 +16,7 @@ const isMobileMenuOpen = ref(false)
 // Navbar mode: 'event' shows org name + event name + back link
 // Default ('platform') shows Crewli logo + page title
 const isEventMode = computed(() => route.meta.navMode === 'event')
-const navTitle = computed(() => (route.meta as any).navTitle as string | undefined)
+const navTitle = computed(() => route.meta.navTitle)
 
 const eventName = computed(() => portal.activeEvent?.event_name ?? '')
 const orgName = computed(() => portal.activeEvent?.organisation_name ?? '')
diff --git a/apps/portal/src/pages/profiel.vue b/apps/portal/src/pages/profiel.vue
index 223755fa..ba43c475 100644
--- a/apps/portal/src/pages/profiel.vue
+++ b/apps/portal/src/pages/profiel.vue
@@ -7,6 +7,8 @@ import { apiClient } from '@/lib/axios'
 import MfaTotpSetupDialog from '@/components/settings/MfaTotpSetupDialog.vue'
 import MfaEmailSetupDialog from '@/components/settings/MfaEmailSetupDialog.vue'
 import MfaDisableDialog from '@/components/settings/MfaDisableDialog.vue'
+import axios from 'axios'
+import type { ApiErrorResponse } from '@/types/api'
 
 definePage({
   name: 'portal-profiel',
@@ -199,14 +201,19 @@ async function saveProfile() {
     snackbarColor.value = 'success'
     snackbar.value = true
   }
-  catch (err: any) {
-    const data = err?.response?.data
-    if (data?.errors) {
-      const firstError = Object.values(data.errors).flat()[0] as string
-      profileError.value = firstError
+  catch (err: unknown) {
+    if (axios.isAxiosError<ApiErrorResponse>(err)) {
+      const data = err.response?.data
+      if (data?.errors) {
+        const firstError = Object.values(data.errors).flat()[0]
+        profileError.value = firstError ?? 'Er is een fout opgetreden.'
+      }
+      else {
+        profileError.value = data?.message ?? 'Er is een fout opgetreden.'
+      }
     }
     else {
-      profileError.value = data?.message ?? 'Er is een fout opgetreden.'
+      profileError.value = 'Er is een fout opgetreden.'
     }
   }
 }
@@ -228,16 +235,21 @@ async function savePassword() {
     snackbarColor.value = 'success'
     snackbar.value = true
   }
-  catch (err: any) {
-    const data = err?.response?.data
-    if (data?.errors) {
-      passwordFieldErrors.value = {}
-      for (const [key, messages] of Object.entries(data.errors)) {
-        passwordFieldErrors.value[key] = (messages as string[])[0]
+  catch (err: unknown) {
+    if (axios.isAxiosError<ApiErrorResponse>(err)) {
+      const data = err.response?.data
+      if (data?.errors) {
+        passwordFieldErrors.value = {}
+        for (const [key, messages] of Object.entries(data.errors)) {
+          passwordFieldErrors.value[key] = messages[0]
+        }
+      }
+      else {
+        passwordError.value = data?.message ?? 'Er is een fout opgetreden.'
       }
     }
     else {
-      passwordError.value = data?.message ?? 'Er is een fout opgetreden.'
+      passwordError.value = 'Er is een fout opgetreden.'
     }
   }
 }
diff --git a/apps/portal/src/types/api.ts b/apps/portal/src/types/api.ts
new file mode 100644
index 00000000..aa4ea5de
--- /dev/null
+++ b/apps/portal/src/types/api.ts
@@ -0,0 +1,5 @@
+export interface ApiErrorResponse {
+  success: false
+  message: string
+  errors?: Record<string, string[]>
+}