diff --git a/src/app.module.ts b/src/app.module.ts
index d9a09f527..416a3e813 100644
--- a/src/app.module.ts
+++ b/src/app.module.ts
@@ -25,9 +25,13 @@ import hstsConfig from './config/hsts.config';
 import cspConfig from './config/csp.config';
 import databaseConfig from './config/database.config';
 import authConfig from './config/auth.config';
+import customizationConfig from './config/customization.config';
+import externalConfig from './config/external-services.config';
 import { PrivateApiModule } from './api/private/private-api.module';
 import { ScheduleModule } from '@nestjs/schedule';
 import { RouterModule, Routes } from 'nest-router';
+import { FrontendConfigService } from './frontend-config/frontend-config.service';
+import { FrontendConfigModule } from './frontend-config/frontend-config.module';
 
 const routes: Routes = [
   {
@@ -53,6 +57,8 @@ const routes: Routes = [
         cspConfig,
         databaseConfig,
         authConfig,
+        customizationConfig,
+        externalConfig,
       ],
       isGlobal: true,
     }),
diff --git a/src/config/customization.config.ts b/src/config/customization.config.ts
new file mode 100644
index 000000000..401e3e2b2
--- /dev/null
+++ b/src/config/customization.config.ts
@@ -0,0 +1,80 @@
+/*
+ * SPDX-FileCopyrightText: 2021 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { registerAs } from '@nestjs/config';
+import * as Joi from 'joi';
+import { buildErrorMessage } from './utils';
+
+export interface CustomizationConfig {
+  branding: {
+    customName: string;
+    customLogo: string;
+  };
+  specialUrls: {
+    privacy: string;
+    termsOfUse: string;
+    imprint: string;
+  };
+}
+
+const schema = Joi.object({
+  branding: Joi.object({
+    customName: Joi.string().optional().label('HD_CUSTOM_NAME'),
+    customLogo: Joi.string()
+      .uri({
+        scheme: [/https?/],
+      })
+      .optional()
+      .label('HD_CUSTOM_LOGO'),
+  }),
+  specialUrls: Joi.object({
+    privacy: Joi.string()
+      .uri({
+        scheme: /https?/,
+      })
+      .optional()
+      .label('HD_PRIVACY_URL'),
+    termsOfUse: Joi.string()
+      .uri({
+        scheme: /https?/,
+      })
+      .optional()
+      .label('HD_TERMS_OF_USE_URL'),
+    imprint: Joi.string()
+      .uri({
+        scheme: /https?/,
+      })
+      .optional()
+      .label('HD_IMPRINT_URL'),
+  }),
+});
+
+export default registerAs('customizationConfig', () => {
+  const customizationConfig = schema.validate(
+    {
+      branding: {
+        customName: process.env.HD_CUSTOM_NAME,
+        customLogo: process.env.HD_CUSTOM_LOGO,
+      },
+      specialUrls: {
+        privacy: process.env.HD_PRIVACY_URL,
+        termsOfUse: process.env.HD_TERMS_OF_USE_URL,
+        imprint: process.env.HD_IMPRINT_URL,
+      },
+    },
+    {
+      abortEarly: false,
+      presence: 'required',
+    },
+  );
+  if (customizationConfig.error) {
+    const errorMessages = customizationConfig.error.details.map(
+      (detail) => detail.message,
+    );
+    throw new Error(buildErrorMessage(errorMessages));
+  }
+  return customizationConfig.value as CustomizationConfig;
+});
diff --git a/src/config/external-services.config.ts b/src/config/external-services.config.ts
new file mode 100644
index 000000000..406633a4e
--- /dev/null
+++ b/src/config/external-services.config.ts
@@ -0,0 +1,49 @@
+/*
+ * SPDX-FileCopyrightText: 2021 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { registerAs } from '@nestjs/config';
+import * as Joi from 'joi';
+import { buildErrorMessage } from './utils';
+
+export interface ExternalServicesConfig {
+  plantUmlServer: string;
+  imageProxy: string;
+}
+
+const schema = Joi.object({
+  plantUmlServer: Joi.string()
+    .uri({
+      scheme: /https?/,
+    })
+    .optional()
+    .label('HD_PLANTUML_SERVER'),
+  imageProxy: Joi.string()
+    .uri({
+      scheme: /https?/,
+    })
+    .optional()
+    .label('HD_IMAGE_PROXY'),
+});
+
+export default registerAs('externalServicesConfig', () => {
+  const externalConfig = schema.validate(
+    {
+      plantUmlServer: process.env.HD_PLANTUML_SERVER,
+      imageProxy: process.env.HD_IMAGE_PROXY,
+    },
+    {
+      abortEarly: false,
+      presence: 'required',
+    },
+  );
+  if (externalConfig.error) {
+    const errorMessages = externalConfig.error.details.map(
+      (detail) => detail.message,
+    );
+    throw new Error(buildErrorMessage(errorMessages));
+  }
+  return externalConfig.value as ExternalServicesConfig;
+});