diff --git a/api/src/routes/settings.test.ts b/api/src/routes/settings.test.ts
index 7589152e271..1818d90c148 100644
--- a/api/src/routes/settings.test.ts
+++ b/api/src/routes/settings.test.ts
@@ -24,6 +24,11 @@ const profileUI = {
   showPortfolio: true
 };
 
+const updateErrorResponse = {
+  type: 'danger',
+  message: 'flash.wrong-updating'
+};
+
 describe('settingRoutes', () => {
   setupServer();
 
@@ -146,12 +151,7 @@ describe('settingRoutes', () => {
           }
         });
 
-        expect(response.body).toEqual({
-          code: 'FST_ERR_VALIDATION',
-          error: 'Bad Request',
-          message: `body/profileUI must have required property 'showAbout'`,
-          statusCode: 400
-        });
+        expect(response.body).toEqual(updateErrorResponse);
         expect(response.statusCode).toEqual(400);
       });
     });
@@ -180,6 +180,7 @@ describe('settingRoutes', () => {
           theme: 'invalid'
         });
 
+        expect(response.body).toEqual(updateErrorResponse);
         expect(response.statusCode).toEqual(400);
       });
     });
@@ -392,6 +393,7 @@ describe('settingRoutes', () => {
           setCookies
         }).send({ keyboardShortcuts: 'invalid' });
 
+        expect(response.body).toEqual(updateErrorResponse);
         expect(response.statusCode).toEqual(400);
       });
     });
@@ -426,6 +428,7 @@ describe('settingRoutes', () => {
           githubProfile: 'invalid'
         });
 
+        expect(response.body).toEqual(updateErrorResponse);
         expect(response.statusCode).toEqual(400);
       });
     });
@@ -450,6 +453,7 @@ describe('settingRoutes', () => {
           setCookies
         }).send({ sendQuincyEmail: 'invalid' });
 
+        expect(response.body).toEqual(updateErrorResponse);
         expect(response.statusCode).toEqual(400);
       });
     });
@@ -525,6 +529,7 @@ describe('settingRoutes', () => {
           setCookies
         }).send({ isHonest: false });
 
+        expect(response.body).toEqual(updateErrorResponse);
         expect(response.statusCode).toEqual(400);
       });
     });
@@ -549,12 +554,7 @@ describe('settingRoutes', () => {
           setCookies
         }).send({ quincyEmails: '123' });
 
-        expect(response.body).toEqual({
-          code: 'FST_ERR_VALIDATION',
-          error: 'Bad Request',
-          message: 'body/quincyEmails must be boolean',
-          statusCode: 400
-        });
+        expect(response.body).toEqual(updateErrorResponse);
         expect(response.statusCode).toEqual(400);
       });
     });
@@ -581,10 +581,7 @@ describe('settingRoutes', () => {
           setCookies
         }).send({});
 
-        expect(response.body).toEqual({
-          type: 'danger',
-          message: 'flash.wrong-updating'
-        });
+        expect(response.body).toEqual(updateErrorResponse);
         expect(response.statusCode).toEqual(400);
       });
 
@@ -599,10 +596,7 @@ describe('settingRoutes', () => {
           ]
         });
 
-        expect(response.body).toEqual({
-          type: 'danger',
-          message: 'flash.wrong-updating'
-        });
+        expect(response.body).toEqual(updateErrorResponse);
         expect(response.statusCode).toEqual(400);
       });
     });
diff --git a/api/src/routes/settings.ts b/api/src/routes/settings.ts
index b976add84dd..f2e08651220 100644
--- a/api/src/routes/settings.ts
+++ b/api/src/routes/settings.ts
@@ -1,3 +1,4 @@
+import type { FastifyError, FastifyReply, FastifyRequest } from 'fastify';
 import { type FastifyPluginCallbackTypebox } from '@fastify/type-provider-typebox';
 import { isProfane } from 'no-profanity';
 import { isValidUsername } from '../../../shared/utils/validate';
@@ -38,10 +39,24 @@ export const settingRoutes: FastifyPluginCallbackTypebox = (
   fastify.addHook('onRequest', fastify.csrfProtection);
   fastify.addHook('onRequest', fastify.authenticateSession);
 
+  function updateErrorHandler(
+    error: FastifyError,
+    request: FastifyRequest,
+    reply: FastifyReply
+  ) {
+    if (error.validation) {
+      void reply.code(400);
+      void reply.send({ message: 'flash.wrong-updating', type: 'danger' });
+    } else {
+      fastify.errorHandler(error, request, reply);
+    }
+  }
+
   fastify.put(
     '/update-my-profileui',
     {
-      schema: schemas.updateMyProfileUI
+      schema: schemas.updateMyProfileUI,
+      errorHandler: updateErrorHandler
     },
     async (req, reply) => {
       try {
@@ -79,7 +94,8 @@ export const settingRoutes: FastifyPluginCallbackTypebox = (
   fastify.put(
     '/update-my-theme',
     {
-      schema: schemas.updateMyTheme
+      schema: schemas.updateMyTheme,
+      errorHandler: updateErrorHandler
     },
     async (req, reply) => {
       try {
@@ -105,7 +121,8 @@ export const settingRoutes: FastifyPluginCallbackTypebox = (
   fastify.put(
     '/update-my-socials',
     {
-      schema: schemas.updateMySocials
+      schema: schemas.updateMySocials,
+      errorHandler: updateErrorHandler
     },
     async (req, reply) => {
       try {
@@ -252,7 +269,8 @@ export const settingRoutes: FastifyPluginCallbackTypebox = (
   fastify.put(
     '/update-my-keyboard-shortcuts',
     {
-      schema: schemas.updateMyKeyboardShortcuts
+      schema: schemas.updateMyKeyboardShortcuts,
+      errorHandler: updateErrorHandler
     },
     async (req, reply) => {
       try {
@@ -278,7 +296,8 @@ export const settingRoutes: FastifyPluginCallbackTypebox = (
   fastify.put(
     '/update-my-quincy-email',
     {
-      schema: schemas.updateMyQuincyEmail
+      schema: schemas.updateMyQuincyEmail,
+      errorHandler: updateErrorHandler
     },
     async (req, reply) => {
       try {
@@ -304,7 +323,8 @@ export const settingRoutes: FastifyPluginCallbackTypebox = (
   fastify.put(
     '/update-my-honesty',
     {
-      schema: schemas.updateMyHonesty
+      schema: schemas.updateMyHonesty,
+      errorHandler: updateErrorHandler
     },
     async (req, reply) => {
       try {
@@ -330,7 +350,8 @@ export const settingRoutes: FastifyPluginCallbackTypebox = (
   fastify.put(
     '/update-privacy-terms',
     {
-      schema: schemas.updateMyPrivacyTerms
+      schema: schemas.updateMyPrivacyTerms,
+      errorHandler: updateErrorHandler
     },
     async (req, reply) => {
       try {
@@ -358,14 +379,7 @@ export const settingRoutes: FastifyPluginCallbackTypebox = (
     '/update-my-portfolio',
     {
       schema: schemas.updateMyPortfolio,
-      errorHandler: (error, request, reply) => {
-        if (error.validation) {
-          void reply.code(400);
-          void reply.send({ message: 'flash.wrong-updating', type: 'danger' });
-        } else {
-          fastify.errorHandler(error, request, reply);
-        }
-      }
+      errorHandler: updateErrorHandler
     },
     async (req, reply) => {
       try {
diff --git a/api/src/schemas.ts b/api/src/schemas.ts
index 55a2bdbcb7a..82ead55db11 100644
--- a/api/src/schemas.ts
+++ b/api/src/schemas.ts
@@ -137,6 +137,7 @@ export const schemas = {
   },
   updateMyAbout: {
     body: Type.Object({
+      // TODO(Post-MVP): make these required
       about: Type.Optional(Type.String()),
       name: Type.Optional(Type.String()),
       picture: Type.Optional(Type.String()),