In this article, we will implement Vue3 application authentication with the JWT auth cookie. So in this portion, we mainly target access token utilization. To know about Jwt authentication in vuejs like managing token using browser storage then check below mentioned articles. Part-1 Jwt Access Token Auth In Vue3 Part2 Refresh Token In Vue3 HTTP Only JWT Cookie: The HTTP only cookie is only accessible by the server application. Client apps like javascript-based apps can't access the HTTP-only cookie. So if we use authentication with HTTP only JWT cookie then we no need to implement custom logic like adding authorization header or storing token data, etc at our client application. Because once the user authenticated, that auth cookie will be automatically sent to the server by the browser on every API call. Authentication API: To implement JWT cookie authentication we need to set up an API. For that, I had created a mock authentication API(Using the NestJS Server framework). So d