diff --git a/commafeed-client/.eslintrc.cjs b/commafeed-client/.eslintrc.cjs
index 98f46470..38791f51 100644
--- a/commafeed-client/.eslintrc.cjs
+++ b/commafeed-client/.eslintrc.cjs
@@ -35,15 +35,10 @@ module.exports = {
     plugins: ["react"],
     rules: {
         "@typescript-eslint/consistent-type-assertions": ["error", { assertionStyle: "as" }],
-        "@typescript-eslint/explicit-function-return-type": "off",
         "@typescript-eslint/no-confusing-void-expression": ["error", { ignoreArrowShorthand: true }],
         "@typescript-eslint/no-floating-promises": "off",
         "@typescript-eslint/no-misused-promises": "off",
-        "@typescript-eslint/no-unsafe-assignment": "off",
-        "@typescript-eslint/no-unsafe-member-access": "off",
         "@typescript-eslint/prefer-nullish-coalescing": ["error", { ignoreConditionalTests: true }],
-        "@typescript-eslint/strict-boolean-expressions": "off",
-        "@typescript-eslint/unbound-method": "off",
         "react/no-unescaped-entities": "off",
         "react/react-in-jsx-scope": "off",
         "react-hooks/exhaustive-deps": "error",
diff --git a/commafeed-client/src/app/client.ts b/commafeed-client/src/app/client.ts
index 449cfb17..8b642985 100644
--- a/commafeed-client/src/app/client.ts
+++ b/commafeed-client/src/app/client.ts
@@ -1,7 +1,8 @@
-import axios from "axios"
+import axios, { AxiosError } from "axios"
 import {
     type AddCategoryRequest,
     type AdminSaveUserRequest,
+    AuthenticationError,
     type Category,
     type CategoryModificationRequest,
     type CollapseRequest,
@@ -31,19 +32,18 @@ const axiosInstance = axios.create({ baseURL: "./rest", withCredentials: true })
 axiosInstance.interceptors.response.use(
     response => response,
     error => {
-        if (axios.isAxiosError(error) && error.response) {
-            const { status, data } = error.response
-            if (
-                (status === 401 && data?.message === "Credentials are required to access this resource.") ||
-                (status === 403 && data?.message === "You don't have the required role to access this resource.")
-            ) {
-                window.location.hash = data?.allowRegistrations ? "/welcome" : "/login"
-            }
+        if (isAuthenticationError(error)) {
+            const data = error.response?.data
+            window.location.hash = data?.allowRegistrations ? "/welcome" : "/login"
         }
         throw error
     }
 )
 
+function isAuthenticationError(error: unknown): error is AxiosError<AuthenticationError> {
+    return axios.isAxiosError(error) && !!error.response && [401, 403].includes(error.response.status)
+}
+
 export const client = {
     category: {
         getRoot: async () => await axiosInstance.get<Category>("category/get"),
@@ -110,11 +110,18 @@ export const errorToStrings = (err: unknown) => {
     let strings: string[] = []
 
     if (axios.isAxiosError(err) && err.response) {
-        const { data } = err.response
-        if (typeof data === "string") strings.push(data)
-        if (typeof data === "object" && data.message) strings.push(data.message as string)
-        if (typeof data === "object" && data.errors) strings = [...strings, ...data.errors]
+        if (typeof err.response.data === "string") strings.push(err.response.data)
+        if (isMessageError(err)) strings.push(err.response.data.message)
+        if (isMessageArrayError(err)) strings = [...strings, ...err.response.data.errors]
     }
 
     return strings
 }
+
+function isMessageError(err: AxiosError): err is AxiosError<{ message: string }> {
+    return !!err.response && !!err.response.data && typeof err.response.data === "object" && "message" in err.response.data
+}
+
+function isMessageArrayError(err: AxiosError): err is AxiosError<{ errors: string[] }> {
+    return !!err.response && !!err.response.data && typeof err.response.data === "object" && "errors" in err.response.data
+}
diff --git a/commafeed-client/src/app/types.ts b/commafeed-client/src/app/types.ts
index e642cb20..0d294a75 100644
--- a/commafeed-client/src/app/types.ts
+++ b/commafeed-client/src/app/types.ts
@@ -284,6 +284,11 @@ export interface AdminSaveUserRequest {
     admin: boolean
 }
 
+export interface AuthenticationError {
+    message: string
+    allowRegistrations: boolean
+}
+
 export type ReadingMode = "all" | "unread"
 
 export type ReadingOrder = "asc" | "desc"