diff --git a/example/server/index.ts b/example/server/index.ts
index 54711f9..ab4997b 100644
--- a/example/server/index.ts
+++ b/example/server/index.ts
@@ -6,10 +6,11 @@ const app = express();
 const router = express.Router();
 const port = 3001;
 const API_KEY = 'example-api-key';
+const URL = 'http://localhost:3000';
 
 app.use(cors());
 
-const uploadJet = new UploadJet({ apiKey: API_KEY });
+const uploadJet = new UploadJet({ apiKey: API_KEY, url: URL });
 const uploadRouteConfig: UploadOptions = {
   fileType: 'image',
   maxFileSize: '1MB',
diff --git a/packages/express/apiProposal.md b/packages/express/apiProposal.md
index 21d4200..5ae4010 100644
--- a/packages/express/apiProposal.md
+++ b/packages/express/apiProposal.md
@@ -8,20 +8,20 @@ Once the package is installed, you can import the library by using import or
 require approach:
 
 ```javascript
-import UploadJet from 'upload-jet';
+import UploadJet from '@upload-jet/express';
 
 // or
 
-const UploadJet = require('upload-jet');
+const UploadJet = require('@upload-jet/express');
 ```
 
 ## Usage
 
-To use the uploader it is required to provide an api key when creating
-a new instance of Upload Jet class.
+To use the uploader it is required to provide an api key and specify the URL of the Upload-Jet server when creating a new instance of the Upload Jet class.
 
 ```javascript
-const uploadJet = new UploadJet({ apiKey: API_KEY });
+const URL = 'SERVER_URL';
+const uploadJet = new UploadJet({ apiKey: API_KEY, url: URL });
 ```
 
 ### Registering a new route
diff --git a/packages/express/src/schema/upload-jet-config.dto.ts b/packages/express/src/schema/upload-jet-config.dto.ts
index 3755015..6499ce3 100644
--- a/packages/express/src/schema/upload-jet-config.dto.ts
+++ b/packages/express/src/schema/upload-jet-config.dto.ts
@@ -2,7 +2,8 @@ import { z } from 'zod';
 
 export const uploadJetConfigSchema = z
   .object({
-    apiKey: z.string()
+    apiKey: z.string(),
+    url: z.string()
   })
   .strict();
 
diff --git a/packages/express/src/upload-jet.ts b/packages/express/src/upload-jet.ts
index d847045..2f4bdae 100644
--- a/packages/express/src/upload-jet.ts
+++ b/packages/express/src/upload-jet.ts
@@ -13,17 +13,18 @@ import { createUploadPolicyBodySchema } from './schema/create-upload-policy-body
 import * as bytes from 'bytes';
 import { ZodError } from 'zod';
 
-const API_URL = 'http://localhost:3000';
 const BAD_REQUEST_CODE = 400;
 const INTERNAL_SERVER_ERROR_CODE = 500;
 const DEFAULT_SERVER_ERROR_MESSAGE = 'Something went wrong.';
 
 export class UploadJet {
   #apiKey: string;
+  #url: string;
 
   constructor(config: UploadJetConfig) {
     const data = uploadJetConfigSchema.parse(config);
     this.#apiKey = data.apiKey;
+    this.#url = data.url;
   }
 
   createUploadRoute(options: UploadOptions) {
@@ -96,7 +97,7 @@ export class UploadJet {
         {}
       );
 
-    const url = new URL('upload-policy', API_URL);
+    const url = new URL('upload-policy', this.#url);
     const headers = { Authorization: `Bearer ${this.#apiKey}` };
     return axios
       .post(url.href, policyRules, { headers })
diff --git a/upload-jet/src/application/application.entity.ts b/upload-jet/src/application/application.entity.ts
index 3977571..852f2c9 100644
--- a/upload-jet/src/application/application.entity.ts
+++ b/upload-jet/src/application/application.entity.ts
@@ -39,7 +39,7 @@ export default class Application extends BaseEntity {
   @Property({ persist: false })
   get keyHint() {
     const apiKeys = this.apiKeys.getItems();
-    return apiKeys.find(apiKey => !apiKey.deletedAt).keyHint;
+    return apiKeys.find(apiKey => !apiKey.deletedAt)?.keyHint;
   }
 
   constructor(name: string, userId: number) {