diff --git a/src/lib/db/feature-type-store.ts b/src/lib/db/feature-type-store.ts
index b7c8119985..10c696d6bd 100644
--- a/src/lib/db/feature-type-store.ts
+++ b/src/lib/db/feature-type-store.ts
@@ -9,7 +9,7 @@ const COLUMNS = ['id', 'name', 'description', 'lifetime_days'];
 const TABLE = 'feature_types';
 
 interface IFeatureTypeRow {
-    id: number;
+    id: string;
     name: string;
     description: string;
     lifetime_days: number;
@@ -39,7 +39,7 @@ class FeatureTypeStore implements IFeatureTypeStore {
         };
     }
 
-    async get(id: number): Promise<IFeatureType | undefined> {
+    async get(id: string): Promise<IFeatureType | undefined> {
         const row = await this.db(TABLE).where({ id }).first();
         return this.rowToFeatureType(row);
     }
@@ -49,7 +49,7 @@ class FeatureTypeStore implements IFeatureTypeStore {
         return this.rowToFeatureType(row);
     }
 
-    async delete(key: number): Promise<void> {
+    async delete(key: string): Promise<void> {
         await this.db(TABLE).where({ id: key }).del();
     }
 
@@ -59,7 +59,7 @@ class FeatureTypeStore implements IFeatureTypeStore {
 
     destroy(): void {}
 
-    async exists(key: number): Promise<boolean> {
+    async exists(key: string): Promise<boolean> {
         const result = await this.db.raw(
             `SELECT EXISTS (SELECT 1 FROM ${TABLE} WHERE id = ?) AS present`,
             [key],
diff --git a/src/lib/openapi/index.ts b/src/lib/openapi/index.ts
index f6bd2bcbed..855f034eff 100644
--- a/src/lib/openapi/index.ts
+++ b/src/lib/openapi/index.ts
@@ -8,6 +8,8 @@ import { environmentSchema } from './spec/environment-schema';
 import { featureEnvironmentSchema } from './spec/feature-environment-schema';
 import { featureSchema } from './spec/feature-schema';
 import { featureStrategySchema } from './spec/feature-strategy-schema';
+import { featureTypeSchema } from './spec/feature-type-schema';
+import { featureTypesSchema } from './spec/feature-types-schema';
 import { featureVariantsSchema } from './spec/feature-variants-schema';
 import { featuresSchema } from './spec/features-schema';
 import { healthOverviewSchema } from './spec/health-overview-schema';
@@ -59,6 +61,8 @@ export const schemas = {
     featureEnvironmentSchema,
     featureSchema,
     featureStrategySchema,
+    featureTypeSchema,
+    featureTypesSchema,
     featureVariantsSchema,
     featuresSchema,
     healthOverviewSchema,
diff --git a/src/lib/openapi/spec/__snapshots__/feature-type-schema.test.ts.snap b/src/lib/openapi/spec/__snapshots__/feature-type-schema.test.ts.snap
new file mode 100644
index 0000000000..1fd9d01904
--- /dev/null
+++ b/src/lib/openapi/spec/__snapshots__/feature-type-schema.test.ts.snap
@@ -0,0 +1,19 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`featureTypeSchema empty 1`] = `
+Object {
+  "data": Object {},
+  "errors": Array [
+    Object {
+      "instancePath": "",
+      "keyword": "required",
+      "message": "must have required property 'id'",
+      "params": Object {
+        "missingProperty": "id",
+      },
+      "schemaPath": "#/required",
+    },
+  ],
+  "schema": "#/components/schemas/featureTypeSchema",
+}
+`;
diff --git a/src/lib/openapi/spec/feature-type-schema.test.ts b/src/lib/openapi/spec/feature-type-schema.test.ts
new file mode 100644
index 0000000000..57219dc6b4
--- /dev/null
+++ b/src/lib/openapi/spec/feature-type-schema.test.ts
@@ -0,0 +1,21 @@
+import { validateSchema } from '../validate';
+import { FeatureTypeSchema } from './feature-type-schema';
+
+test('featureTypeSchema', () => {
+    const data: FeatureTypeSchema = {
+        description: '',
+        id: '',
+        name: '',
+        lifetimeDays: 0,
+    };
+
+    expect(
+        validateSchema('#/components/schemas/featureTypeSchema', data),
+    ).toBeUndefined();
+});
+
+test('featureTypeSchema empty', () => {
+    expect(
+        validateSchema('#/components/schemas/featureTypeSchema', {}),
+    ).toMatchSnapshot();
+});
diff --git a/src/lib/openapi/spec/feature-type-schema.ts b/src/lib/openapi/spec/feature-type-schema.ts
new file mode 100644
index 0000000000..c7a8fed031
--- /dev/null
+++ b/src/lib/openapi/spec/feature-type-schema.ts
@@ -0,0 +1,26 @@
+import { FromSchema } from 'json-schema-to-ts';
+
+export const featureTypeSchema = {
+    $id: '#/components/schemas/featureTypeSchema',
+    type: 'object',
+    additionalProperties: false,
+    required: ['id', 'name', 'description', 'lifetimeDays'],
+    properties: {
+        id: {
+            type: 'string',
+        },
+        name: {
+            type: 'string',
+        },
+        description: {
+            type: 'string',
+        },
+        lifetimeDays: {
+            type: 'number',
+            nullable: true,
+        },
+    },
+    components: {},
+} as const;
+
+export type FeatureTypeSchema = FromSchema<typeof featureTypeSchema>;
diff --git a/src/lib/openapi/spec/feature-types-schema.ts b/src/lib/openapi/spec/feature-types-schema.ts
new file mode 100644
index 0000000000..33ce80980a
--- /dev/null
+++ b/src/lib/openapi/spec/feature-types-schema.ts
@@ -0,0 +1,27 @@
+import { FromSchema } from 'json-schema-to-ts';
+import { featureTypeSchema } from './feature-type-schema';
+
+export const featureTypesSchema = {
+    $id: '#/components/schemas/featureTypesSchema',
+    type: 'object',
+    additionalProperties: false,
+    required: ['version', 'types'],
+    properties: {
+        version: {
+            type: 'integer',
+        },
+        types: {
+            type: 'array',
+            items: {
+                $ref: '#/components/schemas/featureTypeSchema',
+            },
+        },
+    },
+    components: {
+        schemas: {
+            featureTypeSchema,
+        },
+    },
+} as const;
+
+export type FeatureTypesSchema = FromSchema<typeof featureTypesSchema>;
diff --git a/src/lib/routes/admin-api/email.ts b/src/lib/routes/admin-api/email.ts
index 8fb851ea05..5a9822900c 100644
--- a/src/lib/routes/admin-api/email.ts
+++ b/src/lib/routes/admin-api/email.ts
@@ -1,12 +1,16 @@
 import { ADMIN } from '../../types/permissions';
-import { TemplateFormat } from '../../services/email-service';
+import { EmailService, TemplateFormat } from '../../services/email-service';
 import { IUnleashConfig } from '../../types/option';
 import { IUnleashServices } from '../../types/services';
 import { Request, Response } from 'express';
-
-const Controller = require('../controller');
+import Controller from '../controller';
+import { Logger } from '../../logger';
 
 export default class EmailController extends Controller {
+    private emailService: EmailService;
+
+    private logger: Logger;
+
     constructor(
         config: IUnleashConfig,
         { emailService }: Pick<IUnleashServices, 'emailService'>,
diff --git a/src/lib/routes/admin-api/feature-type.ts b/src/lib/routes/admin-api/feature-type.ts
index cb7a16f210..4aa847b336 100644
--- a/src/lib/routes/admin-api/feature-type.ts
+++ b/src/lib/routes/admin-api/feature-type.ts
@@ -3,31 +3,57 @@ import { IUnleashServices } from '../../types/services';
 import FeatureTypeService from '../../services/feature-type-service';
 import { Logger } from '../../logger';
 import { IUnleashConfig } from '../../types/option';
-
-const Controller = require('../controller');
+import { OpenApiService } from '../../services/openapi-service';
+import { NONE } from '../../types/permissions';
+import { FeatureTypesSchema } from '../../openapi/spec/feature-types-schema';
+import { createResponseSchema } from '../../openapi';
+import Controller from '../controller';
 
 const version = 1;
 
-export default class FeatureTypeController extends Controller {
+export class FeatureTypeController extends Controller {
     private featureTypeService: FeatureTypeService;
 
+    private openApiService: OpenApiService;
+
     private logger: Logger;
 
     constructor(
         config: IUnleashConfig,
-        { featureTypeService }: Pick<IUnleashServices, 'featureTypeService'>,
+        {
+            featureTypeService,
+            openApiService,
+        }: Pick<IUnleashServices, 'featureTypeService' | 'openApiService'>,
     ) {
         super(config);
         this.featureTypeService = featureTypeService;
+        this.openApiService = openApiService;
         this.logger = config.getLogger('/admin-api/feature-type.js');
 
-        this.get('/', this.getAllFeatureTypes);
+        this.route({
+            method: 'get',
+            path: '',
+            handler: this.getAllFeatureTypes,
+            permission: NONE,
+            middleware: [
+                openApiService.validPath({
+                    tags: ['admin'],
+                    operationId: 'getAllFeatureTypes',
+                    responses: {
+                        200: createResponseSchema('featureTypesSchema'),
+                    },
+                }),
+            ],
+        });
     }
 
-    async getAllFeatureTypes(req: Request, res: Response): Promise<void> {
-        const types = await this.featureTypeService.getAll();
-        res.json({ version, types });
+    async getAllFeatureTypes(
+        req: Request,
+        res: Response<FeatureTypesSchema>,
+    ): Promise<void> {
+        res.json({
+            version,
+            types: await this.featureTypeService.getAll(),
+        });
     }
 }
-
-module.exports = FeatureTypeController;
diff --git a/src/lib/routes/admin-api/index.ts b/src/lib/routes/admin-api/index.ts
index 79e7b415d0..69493f7de8 100644
--- a/src/lib/routes/admin-api/index.ts
+++ b/src/lib/routes/admin-api/index.ts
@@ -3,7 +3,7 @@ import Controller from '../controller';
 import { IUnleashServices } from '../../types/services';
 import { IUnleashConfig } from '../../types/option';
 import FeatureController from './feature';
-import FeatureTypeController from './feature-type';
+import { FeatureTypeController } from './feature-type';
 import ArchiveController from './archive';
 import StrategyController from './strategy';
 import EventController from './event';
diff --git a/src/lib/services/email-service.ts b/src/lib/services/email-service.ts
index 022f60840d..f2307a50ec 100644
--- a/src/lib/services/email-service.ts
+++ b/src/lib/services/email-service.ts
@@ -189,10 +189,10 @@ export class EmailService {
         return this.mailer !== undefined;
     }
 
-    private async compileTemplate(
+    async compileTemplate(
         templateName: string,
         format: TemplateFormat,
-        context: any,
+        context: unknown,
     ): Promise<string> {
         try {
             const template = this.resolveTemplate(templateName, format);
diff --git a/src/lib/types/stores/feature-type-store.ts b/src/lib/types/stores/feature-type-store.ts
index 4776eb1fff..dfc34e43e3 100644
--- a/src/lib/types/stores/feature-type-store.ts
+++ b/src/lib/types/stores/feature-type-store.ts
@@ -1,12 +1,12 @@
 import { Store } from './store';
 
 export interface IFeatureType {
-    id: number;
+    id: string;
     name: string;
     description: string;
-    lifetimeDays: number;
+    lifetimeDays: number | null;
 }
 
-export interface IFeatureTypeStore extends Store<IFeatureType, number> {
+export interface IFeatureTypeStore extends Store<IFeatureType, string> {
     getByName(name: string): Promise<IFeatureType>;
 }
diff --git a/src/test/e2e/api/admin/feature-type.test.ts b/src/test/e2e/api/admin/feature-type.test.ts
index beebe404a3..4ceb529a9a 100644
--- a/src/test/e2e/api/admin/feature-type.test.ts
+++ b/src/test/e2e/api/admin/feature-type.test.ts
@@ -1,6 +1,8 @@
 import dbInit from '../../helpers/database-init';
 import getLogger from '../../../fixtures/no-logger';
 import { setupApp } from '../../helpers/test-helper';
+import { validateSchema } from '../../../../lib/openapi/validate';
+import { featureTypesSchema } from '../../../../lib/openapi/spec/feature-types-schema';
 
 let app;
 let db;
@@ -22,9 +24,11 @@ test('Should get all defined feature types', async () => {
         .expect('Content-Type', /json/)
         .expect((res) => {
             const { version, types } = res.body;
-
             expect(version).toBe(1);
             expect(types.length).toBe(5);
             expect(types[0].name).toBe('Release');
+            expect(
+                validateSchema(featureTypesSchema.$id, res.body),
+            ).toBeUndefined();
         });
 });
diff --git a/src/test/e2e/api/openapi/__snapshots__/openapi.e2e.test.ts.snap b/src/test/e2e/api/openapi/__snapshots__/openapi.e2e.test.ts.snap
index 59d5f6051a..c7ffc6ef38 100644
--- a/src/test/e2e/api/openapi/__snapshots__/openapi.e2e.test.ts.snap
+++ b/src/test/e2e/api/openapi/__snapshots__/openapi.e2e.test.ts.snap
@@ -321,6 +321,50 @@ Object {
         ],
         "type": "object",
       },
+      "featureTypeSchema": Object {
+        "additionalProperties": false,
+        "properties": Object {
+          "description": Object {
+            "type": "string",
+          },
+          "id": Object {
+            "type": "string",
+          },
+          "lifetimeDays": Object {
+            "nullable": true,
+            "type": "number",
+          },
+          "name": Object {
+            "type": "string",
+          },
+        },
+        "required": Array [
+          "id",
+          "name",
+          "description",
+          "lifetimeDays",
+        ],
+        "type": "object",
+      },
+      "featureTypesSchema": Object {
+        "additionalProperties": false,
+        "properties": Object {
+          "types": Object {
+            "items": Object {
+              "$ref": "#/components/schemas/featureTypeSchema",
+            },
+            "type": "array",
+          },
+          "version": Object {
+            "type": "integer",
+          },
+        },
+        "required": Array [
+          "version",
+          "types",
+        ],
+        "type": "object",
+      },
       "featureVariantsSchema": Object {
         "additionalProperties": false,
         "properties": Object {
@@ -1014,6 +1058,26 @@ Object {
         ],
       },
     },
+    "/api/admin/feature-types": Object {
+      "get": Object {
+        "operationId": "getAllFeatureTypes",
+        "responses": Object {
+          "200": Object {
+            "content": Object {
+              "application/json": Object {
+                "schema": Object {
+                  "$ref": "#/components/schemas/featureTypesSchema",
+                },
+              },
+            },
+            "description": "featureTypesSchema",
+          },
+        },
+        "tags": Array [
+          "admin",
+        ],
+      },
+    },
     "/api/admin/features": Object {
       "get": Object {
         "deprecated": true,
diff --git a/src/test/e2e/stores/feature-type-store.e2e.test.ts b/src/test/e2e/stores/feature-type-store.e2e.test.ts
index dceebde442..e7da2e08d3 100644
--- a/src/test/e2e/stores/feature-type-store.e2e.test.ts
+++ b/src/test/e2e/stores/feature-type-store.e2e.test.ts
@@ -28,8 +28,8 @@ test('should be possible to get by name', async () => {
 });
 
 test('should be possible to get by id', async () => {
-    const type = await featureTypeStore.exists(0);
-    expect(type).toBeDefined();
+    expect(await featureTypeStore.exists('unknown')).toEqual(false);
+    expect(await featureTypeStore.exists('operational')).toEqual(true);
 });
 
 test('should be possible to delete by id', async () => {
diff --git a/src/test/fixtures/fake-feature-type-store.ts b/src/test/fixtures/fake-feature-type-store.ts
index d9c95ac175..028f700cb3 100644
--- a/src/test/fixtures/fake-feature-type-store.ts
+++ b/src/test/fixtures/fake-feature-type-store.ts
@@ -7,7 +7,7 @@ import NotFoundError from '../../lib/error/notfound-error';
 export default class FakeFeatureTypeStore implements IFeatureTypeStore {
     featureTypes: IFeatureType[] = [];
 
-    async delete(key: number): Promise<void> {
+    async delete(key: string): Promise<void> {
         this.featureTypes.splice(
             this.featureTypes.findIndex((type) => type.id === key),
             1,
@@ -20,11 +20,11 @@ export default class FakeFeatureTypeStore implements IFeatureTypeStore {
 
     destroy(): void {}
 
-    async exists(key: number): Promise<boolean> {
+    async exists(key: string): Promise<boolean> {
         return this.featureTypes.some((fT) => fT.id === key);
     }
 
-    async get(key: number): Promise<IFeatureType> {
+    async get(key: string): Promise<IFeatureType> {
         const type = this.featureTypes.find((fT) => fT.id === key);
         if (type) {
             return type;