diff --git a/src/api.test.js b/src/api.test.js
deleted file mode 100644
index b658408..0000000
--- a/src/api.test.js
+++ /dev/null
@@ -1,10 +0,0 @@
-// SPDX-FileCopyrightText: 2023 Aravinth Manivannan <realaravinth@batsense.net>
-//
-// SPDX-License-Identifier: AGPL-3.0-or-later
-
-import Forgejo from './api';
-
-test('foo', () => {
-  const api = new Forgejo('https://git.batsense.net'); 
-  api.markNotificationReadForRepo(12)
-});
diff --git a/src/api.test.ts b/src/api.test.ts
new file mode 100644
index 0000000..81f1fbd
--- /dev/null
+++ b/src/api.test.ts
@@ -0,0 +1,11 @@
+import Forgejo from "./api";
+import authtoken from "../secrets/user1-accesstoken.json";
+
+test("use authentication without setting it ", () => {
+  const api = new Forgejo("http://localhost:3000", "owner_user");
+  const token = authtoken["sha1"]
+
+  expect(() => api.getTokenAuth()).toThrow();
+  api.setTokenAuth(token)
+  expect(api.getTokenAuth().getToken()).toBe(token)
+});
diff --git a/src/api.js b/src/api.ts
similarity index 62%
rename from src/api.js
rename to src/api.ts
index 239ce56..7242fd0 100644
--- a/src/api.js
+++ b/src/api.ts
@@ -2,23 +2,49 @@
 //
 // SPDX-License-Identifier: AGPL-3.0-or-later
 
+import Auth from "./auth";
+
 class Forgejo {
+  url: URL;
+  username: string;
+  token?: Auth;
   /**
    * Represents a Forgejo instance.
    * @constructor
    * @param {string} url - The URL of the Forgejo instance
    * @param {string} username - username of the logged in user
    */
-  constructor(url, username) {
+  constructor(url: string, username: string) {
     this.url = new URL(url);
     this.username = username;
   }
 
+  /**
+   * Authenticate with token
+   * @param {Auth} token - access token
+   */
+  setTokenAuth(token: string) {
+    this.token = new Auth(token);
+    console.log(this.token.getToken())
+  }
+
+  getTokenAuth(): Auth {
+    if (this.token) {
+      return this.token;
+    } else {
+      throw new Error("set authentication token before use");
+    }
+  }
+
+  getTokenAuthHeader() {
+    return { Authentication: `Bearer ${this.getTokenAuth().getToken()}` };
+  }
+
   /**
    * Get all notifications
    */
   async getNotifications() {
-    this.url.path = "/api/v1/notifications";
+    this.url.pathname = "/api/v1/notifications";
     let res = await fetch(this.url);
     return await res.json();
   }
@@ -26,7 +52,7 @@ class Forgejo {
    * Get number of unread notifications
    */
   async getNumUnreadNotifications() {
-    this.url.path = "/api/v1/notifications/new";
+    this.url.pathname = "/api/v1/notifications/new";
     let res = await fetch(this.url);
     return await res.json()["new"];
   }
@@ -35,8 +61,8 @@ class Forgejo {
    * Get Notification Thread
    * @param {number} id - The ID of a notification thread
    */
-  async getNotificationThread(id) {
-    this.url.path = `/api/v1/notifications/threads/${id}`;
+  async getNotificationThread(id: number) {
+    this.url.pathname = `/api/v1/notifications/threads/${id}`;
     let res = await fetch(this.url);
     return await res.json();
   }
@@ -44,18 +70,18 @@ class Forgejo {
   /**
    * Get the time at which the issue was last read
    */
-  lastReadTime(issue) {
+  lastReadTime(issue: number): number {
     return 10120123; // TODO: return last read UNIX epoch time from storage. If unread, return 0
   }
 
   /**
-   * Check if logged in user is mentioned in the issue 
+   * Check if logged in user is mentioned in the issue
    */
-  async findMentionsInIssue(id) {
-    let issue = this.getIssue(id);
+  async findMentionsInIssue(owner: string, repo: string, id: number) {
+    let issue = this.getIssue(owner, repo, id);
     let unreadTime = this.lastReadTime(issue);
 
-    const mentionUtil = (str) => str.includes(this.username);
+    const mentionUtil = (str: string): boolean => str.includes(this.username);
 
     const items = [];
 
@@ -89,8 +115,8 @@ class Forgejo {
    * Mark Notification Read
    * @param {number} id - The ID of a notification thread
    */
-  async markNotificationRead(id) {
-    this.url.path = `/api/v1/notifications/threads/${id}`;
+  async markNotificationRead(id: number) {
+    this.url.pathname = `/api/v1/notifications/threads/${id}`;
     await fetch(this.url, { method: "PATCH" });
   }
 
@@ -99,8 +125,8 @@ class Forgejo {
    * @param {string} owner - Name of the owner of the repository
    * @param {string} repo - Name of the repository
    */
-  async markNotificationReadForRepo(owner, repo) {
-    this.url.path = `/api/v1/repos/${owner}/${repo}/notifications`;
+  async markNotificationReadForRepo(owner: string, repo: string) {
+    this.url.pathname = `/api/v1/repos/${owner}/${repo}/notifications`;
     await fetch(this.url, { method: "PUT" });
   }
 
@@ -110,7 +136,7 @@ class Forgejo {
    * @param {str} repo - The name of the repository
    * @param {number} id - The ID of an issue
    */
-  async getIssue(owner, repo, id) {}
+  async getIssue(owner: string, repo: string, id: number) {}
 }
 
 export default Forgejo;
diff --git a/src/auth.ts b/src/auth.ts
new file mode 100644
index 0000000..d05ff95
--- /dev/null
+++ b/src/auth.ts
@@ -0,0 +1,12 @@
+class Auth {
+  token: string;
+  constructor(token: string) {
+    this.token = token;
+  }
+
+  getToken(): string {
+    return this.token;
+  }
+}
+
+export default Auth;