diff --git a/api/v1/content.js b/api/v1/content.js
index 3f41348..d62ce82 100755
--- a/api/v1/content.js
+++ b/api/v1/content.js
@@ -120,7 +120,7 @@ app.get('/category/:category/info', [
             users: users
         }
     });
-}));
+}, undefined, config.roleMap.USER));
 
 app.get('/category/list', authenticateEndpoint(async (req, res, user) => {
     let count = parseInt(req.query.count);
@@ -136,6 +136,6 @@ app.get('/category/list', authenticateEndpoint(async (req, res, user) => {
         message: 'SUCCESS_CATEGORY_LIST_FETCHED',
         categories
     });
-}));
+}, undefined, config.roleMap.USER));
 
 module.exports = app;
\ No newline at end of file
diff --git a/api/v1/users.js b/api/v1/users.js
index 7155e1a..30eeb7f 100755
--- a/api/v1/users.js
+++ b/api/v1/users.js
@@ -22,11 +22,26 @@ const createAccountLimiter = rateLimit({
     message: "You are being rate limited"
 });
 
+app.get('/account/create/info', async (req, res) => {
+    const restrictions = config.restrictions.signup;
+    let requiresCode = false;
+    if (restrictions && restrictions.specialCode) {
+        requiresCode = true;
+    }
+
+    res.json({
+        error: false,
+        message: 'SUCCESS_ACCOUNT_CREATE_INFO_FETCH',
+        requiresSpecialCode: requiresCode
+    });
+});
+
 app.post('/account/create', [
     createAccountLimiter,
     body('username').not().isEmpty().trim().isLength({ min: 3, max: 32 }).isAlphanumeric(),
     body('email').not().isEmpty().isEmail().normalizeEmail(),
-    body('password').not().isEmpty().isLength({ min: 8, max: 128 })
+    body('password').not().isEmpty().isLength({ min: 8, max: 128 }),
+    body('specialCode').optional().isLength({ min: 12, max: 12 }).isAlphanumeric()
 ], async (req, res) => {
     try {
         const errors = validationResult(req);
@@ -34,6 +49,22 @@ app.post('/account/create', [
             res.status(400).json({ error: true, message: 'ERROR_REQUEST_INVALID_DATA', errors: errors.array() });
             return;
         }
+
+        const restrictions = config.restrictions.signup;
+        if (restrictions && restrictions.specialCode) {
+            const passedSpecialCode = req.body.specialCode;
+            const specialCode = restrictions.specialCode;
+
+            if (passedSpecialCode && specialCode) {
+                if (specialCode !== passedSpecialCode) {
+                    res.status(401).json({ error: true, message: 'ERROR_REQUEST_SPECIAL_CODE_MISSING', errors: [{ msg: 'No specialCode passed', param: 'specialCode', location: 'body' }] });
+                    return false;
+                }
+            } else {
+                res.status(401).json({ error: true, message: 'ERROR_REQUEST_SPECIAL_CODE_MISSING', errors: [{ msg: 'No specialCode passed', param: 'specialCode', location: 'body' }] });
+                return false;
+            }
+        }
     
         const username = req.body.username;
     
@@ -171,7 +202,7 @@ app.get('/user/:userid/info', [
         message: 'SUCCESS_USER_DATA_FETCHED',
         user: await otherUser.getPublicObject(),
     });
-}));
+}, undefined, config.roleMap.USER));
 
 app.post('/browser/token/clear', authenticateEndpoint((req, res, user) => {
     res.clearCookie('token');
diff --git a/app/auth.html b/app/auth.html
index aa3f41b..4f76fb9 100755
--- a/app/auth.html
+++ b/app/auth.html
@@ -47,13 +47,26 @@
                             </md-field>
                         </div>
                     </div>
+                    <div v-if="mode === 'SPECIAL_CODE'">
+                        <div>
+                            <p>
+                                The owner of this Brainlet instance has made it so that signing up requires a special code.
+                            </p>
+                            <md-field>
+                                <label>Special code</label>
+                                <md-input v-model="specialCodeInput" type="password"></md-input>
+                            </md-field>
+                        </div>
+                    </div>
                 </md-card-content>
     
                 <md-card-actions>
                     <md-button v-if="mode === 'SIGNUP'" @click="mode='LOGIN'" class="md-dense">Log in instead</md-button>
                     <md-button v-if="mode === 'LOGIN'" @click="mode='SIGNUP'" class="md-dense">Sign up instead</md-button>
                     
-                    <md-button v-if="mode === 'SIGNUP'" class="md-dense md-raised md-primary" @click="performAccountCreation()">Sign up</md-button>
+                    <md-button v-if="mode === 'SPECIAL_CODE'" class="md-dense" @click="mode='SIGNUP'">Go back</md-button>
+                    <md-button v-if="mode === 'SIGNUP' || mode === 'SPECIAL_CODE'" class="md-dense md-raised md-primary" @click="performAccountCreation()">Sign up</md-button>
+
                     <md-button v-if="mode === 'LOGIN'" class="md-dense md-raised md-primary" @click="performTokenCreation()">Log in</md-button>
                 
                     <md-button v-if="mode === 'MANAGE'" class="md-dense md-raised" @click="performTokenRemoval()">Log out</md-button>
diff --git a/app/resources/js/auth.js b/app/resources/js/auth.js
index 5b79b8c..f1e6788 100755
--- a/app/resources/js/auth.js
+++ b/app/resources/js/auth.js
@@ -30,6 +30,9 @@ const getSignupMessageFromError = (json) => {
                 case 'email': {
                     return 'Invalid email.';
                 }
+                case 'specialCode': {
+                    return 'Invalid special code.';
+                }
 
                 default: {
                     return 'Invalid value sent to server. Something went wrong.';
@@ -58,13 +61,15 @@ const app = new Vue({
         usernameInput: '',
         emailInput: '',
         passwordInput: '',
+        specialCodeInput: '',
         mode: 'SIGNUP',
         showSnackbarNotification: false,
         snackbarNotification: '',
         snackbarNotificationDuration: 999999,
         snackbarButtonText: 'Ok',
         successfulLogin: false,
-        loggedInUser: {}
+        loggedInUser: {},
+        requiresSpecialCode: null
     },
     mounted: async function() {
         const res = await fetch(`${window.location.origin}/api/v1/users/current/info`, {
@@ -86,7 +91,21 @@ const app = new Vue({
                 this.successfulLogin = true;
             }
         } else {
-            this.mode = 'SIGNUP';
+            const resInfo = await fetch(`${window.location.origin}/api/v1/users/account/create/info`, {
+                method: 'GET',
+                headers: {
+                    'Accept': 'application/json',
+                }
+            });
+
+            if (resInfo.ok) {
+                const json = await resInfo.json();
+                this.requiresSpecialCode = json.requiresSpecialCode;
+
+                this.mode = 'SIGNUP';
+            } else {
+                this.mode = '_ERROR';
+            }
         }
     },
     computed: {
@@ -104,6 +123,9 @@ const app = new Vue({
                 case 'MANAGE': {
                     return this.loggedInUser.username || 'Unknown account';
                 }
+                case 'SPECIAL_CODE': {
+                    return 'Just one more step'
+                }
                 case 'NONE': {
                     return '';
                 }
@@ -192,17 +214,33 @@ const app = new Vue({
             }
         },
         performAccountCreation: async function() {
+            let jsonData = {
+                username: this.usernameInput,
+                email: this.emailInput,
+                password: this.passwordInput
+            };
+
+            if (this.requiresSpecialCode) {
+                if (this.mode === 'SIGNUP') {
+                    this.mode = 'SPECIAL_CODE';
+                    return;
+                } else if (this.mode !== 'SPECIAL_CODE') {
+                    return;
+                }
+
+                jsonData = {
+                    specialCode: this.specialCodeInput,
+                    ...jsonData
+                }
+            }
+
             const res = await fetch(`${window.location.origin}/api/v1/users/account/create`, {
                 method: 'POST',
                 headers: {
                     'Accept': 'application/json',
                     'Content-Type': 'application/json'
                 },
-                body: JSON.stringify({
-                    username: this.usernameInput,
-                    email: this.emailInput,
-                    password: this.passwordInput
-                })
+                body: JSON.stringify(jsonData)
             });
 
             const json = await res.json();