> For the complete documentation index, see [llms.txt](https://phoenixcoded.gitbook.io/able-pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://phoenixcoded.gitbook.io/able-pro/vue/development/authentication.md).

# Authentication

JSON Web Token (JWT) is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object.

This information can be verified and trusted because it is digitally signed. JWTs can be signed using a secret (with the HMAC algorithm) or a public/private key pair using RSA or ECDSA.

### How does it work?

Only authenticated users can access dashboard pages. If a user is not authenticated, the user is redirected to the login page.

#### Main.ts

```typescript
// Main.ts
import { fakeBackend } from '@/utils/helpers/fake-backend';
fakeBackend();
```

#### router.ts

```typescript
// router.ts
router.beforeEach(async (to) => {
  const auth = useAuthStore();

  const routeName = String(to.name ?? '');
  const authRequired = routeName.startsWith('/(main)') || to.matched.some((record) => record.meta.requiresAuth === true);

  if (authRequired && !auth.user) {
    auth.returnUrl = to.fullPath;
    return { path: '/login' };
  }

  if (auth.user && to.path === '/login') {
    return { path: auth.returnUrl || '/' };
  }
});
```