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Follow this quickstart tutorial to add authentication to your Vue application

Authgear helps you add user logins to your Vue apps. It provides prebuilt login page and user settings page that accelerate the development.

Follow this 🕐 15 minutes tutorial to create a simple app using Vue with Authgear SDK.

Check out and clone the Sample Project on GitHub.

Table of Content

Setup Application in Authgear

Signup for an account in https://portal.authgear.com/ and create a Project.

After that, we will need to create an Application in the Project Portal.

Create an application in the Portal

  1. Go to Applications on the left menu bar.

  2. Click ⊕Add Application in the top tool bar.

  3. Input the name of your application, e.g. "MyAwesomeApp".

  4. Select Single Page Application as the application type

  5. Click "Save" to create the application

Configure Authorize Redirect URI

The Redirect URI is a URL in you application where the user will be redirected to after login with Authgear. In this path, make a finish authentication call to complete the login process.

For this tutorial, add http://localhost:4000/auth-redirect to Authorize Redirect URIs.

Configure Post Logout Redirect URI

The Post Logout Redirect URI is the URL users will be redirected after they have logged out. The URL must be whitelisted.

For this tutorial, add http://localhost:4000/ to Post Logout Redirect URIs.

Save the configuration before next steps.

Step 1: Create a simple Vue project

Here are some recommended steps to scaffold a Vue project. You can skip this part if you are adding Authgear to an existing project. See Step 3: Install Authgear SDK to the project in the next section.

Install basic project dependencies

Create the project folder and install the dependencies. We will use vite as the build tool and the vue-router package. Also, we will use TypeScript in this tutorial. 

# Create a brand new project using vite
npm create vite@latest my-app -- --template vue-ts
# Move into the project directory
cd my-app
# Install dependencies
npm install
# Install vue-router
npm install --save-exact vue-router

Add port configuration for development mode

As we are using port 4000 for this tutorial, we need to add the port information to the config. In the vite.config.ts file, modify the file with the following lines:

// vite.config.ts
import { defineConfig } from "vite";
import vue from "@vitejs/plugin-vue";

// https://vitejs.dev/config/
export default defineConfig({
  plugins: [vue()],
  server: {
    port: 4000,
  },
});

After doing so, when you run npm run dev , the server will be running on port 4000.

Create the Home.vue file

Create a new file called Home.vue in the src/components folder with simply showing Hello World on the screen. 

// src/components/Home.vue
<script setup lang="ts"></script>

<template><div>Hello World</div></template>

Edit the App.vue file

The App.vue file is generated by Vite already but some sections might not being needed for this tutorial. 

// src/components/App.vue
<script setup lang="ts">
import Home from "./components/Home.vue";
</script>

<template>
  <Home />
</template>

Delete unnecessary files

Some of the files might not being used and thus can be deleted. You can perform the following script to delete these files: 

rm -rf src/assets src/components/HelloWorld.vue

File structure

The file structure in your project is now:

my-app
├── node_modules
│   └── (...)
├── package-lock.json
├── package.json
├── vite.config.ts
├── (...)
└── src
    ├── components
    │   └── Home.vue
    ├── App.vue
    ├── main.ts
    └── (...)

Run npm run dev now to run the project and you will see default page with the title Vite + Vue and a count button on http://localhost:4000.

Step 2: Create routes for the project

Create a AuthReditect.vue file in the src/components folder with the same content as src/components/Home.vue at this moment.

Create a file called router.ts in the src/ folder. We will import Home and AuthRedirect component as the route and we will implement these components later. The content of this file will look like this: 

// src/router.ts
import { createRouter, createWebHistory } from "vue-router";

export const history = createWebHistory();
export const router = createRouter({
  history,
  routes: [
    {
      path: "/",
      // We will implement this component later
      component: () => import("./components/Home.vue"),
    },
    {
      path: "/auth-redirect",
      // We will implement this component later
      component: () => import("./components/AuthRedirect.vue"),
    },
  ],
});

Step 3: Install Authgear SDK to the project

Run the following command within your Vue project directory to install the Authgear Web SDK

npm install --save-exact @authgear/web

In src/main.ts , import authgear and call the configure function to initialize an Authgear instance on application loads. We will also import router and use it to build routes for us. 

// src/main.ts
import { createApp } from "vue";
import './style.css'
import App from "./App.vue";
import { router } from "./router";
import authgear from "@authgear/web";

const app = createApp(App);

async function init() {
  try {
    // configure Authgear container instance
    await authgear.configure({
      endpoint: "<your_app_endpoint>",
      clientID: "<your_client_id>",
      sessionType: "refresh_token",
    });
  } finally {
    app.use(router);
    app.mount("#app");
  }
}

init().catch((e) => {
  // Error handling
  console.error(e)
});

The Authgear container instance takes endpoint and clientID as parameters. They can be obtained from the application page created in Setup Application in Authgear.

It is recommend to render the app after configure() resolves. So by the time the app is rendered, Authgear is ready to use.

Run npm run dev now and you should see the same page and no error message in the console if Authgear SDK is configured successfully

Step 4: Implement the Context Provider

Since we want to reference the logged in state in anywhere of the app, let's put the state in a context provider with UserProvider.vue in the /src/contexts folder.

In UserProvider.vue, it will have a isLoggedIn boolean value. The isLoggedIn boolean state can be auto updated using the onSessionStateChange callback. This callback can be stored in delegate which is in the local SDK container. 

// src/context/UserProvider.vue
<script lang="ts">
import {
  defineComponent,
  InjectionKey,
  provide,
  readonly,
  ref,
  Ref,
  toRefs,
} from "vue";
import authgear from "@authgear/web";

export interface UserContextValue {
  isLoggedIn: Ref<boolean>;
}

export const UserStateSymbol: InjectionKey<UserContextValue> =
  Symbol("UserState");

export default defineComponent({
  setup() {
    const isLoggedIn = ref(false);

    const state: UserContextValue = {
      isLoggedIn,
    };

    authgear.delegate = {
      onSessionStateChange: (container) => {
        const sessionState = container.sessionState;
        if (sessionState === "AUTHENTICATED") {
          isLoggedIn.value = true;
        } else {
          isLoggedIn.value = false;
        }
      },
    };

    provide<UserContextValue>(UserStateSymbol, toRefs(readonly(state)));

    return { state };
  },
});
</script>

<template>
  <slot />
</template>

Step 5: Implement the Auth Redirect

Next, we will add an "AuthRedirect" page for handling the authentication result after the user have been authenticated by Authgear.

Create the AuthRedirect.vue component file in the src/components/ folder.

Call the Authgear finishAuthentication() function in the Auth Redirect component to send a token back to Authgear server in exchange for access token and refresh token. Don't worry about the technical jargons, finishAuthentication() will do all the hard work for you and and save the authentication data.

When the authentication is finished, the isLoggedIn state from the UserContextProvider will automatic set to true. Finally, navigate back to root (/) which is our Home page.

The final AuthRedirect.vue will look like this

// src/components/AuthRedirect.vue
<script setup lang="ts">
import { onMounted } from "vue";
import authgear from "@authgear/web";
import { router } from "../router";

onMounted(() => {
  async function updateToken() {
    try {
      await authgear.finishAuthentication();
    } finally {
      router.replace({ path: "/" });
    }
  }
  updateToken().catch((e) => console.error(e));
});
</script>

<template></template>

Step 6: Apply Routes and Context Provider to the App

As we have already configure the routes in the previous section, we can simply add <router-view /> tag to the App.vue. We can then Import UserProvider and wrap the router-view with it.

Your final App.vue should look like this:

// src/App.vue
<script setup lang="ts">
import UserProvider from "./contexts/UserProvider.vue";
</script>

<template>
  <UserProvider>
    <router-view />
  </UserProvider>
</template>

The file structure should now look like

src
├── App.vue
├── main.ts
├── router.ts
├── vite-env.d.ts
├── contexts
│   └── UserProvider.vue
└── components
    ├── AuthRedirect.vue
    └── Home.vue

Step 7: Add a Login button

First we will import the Authgear dependency. Then add the login button which will call startAuthentication(ConfigureOptions) through startLogin callback on click. This will redirect the user to the login page.

// src/components/Home.vue
<script setup lang="ts">
import authgear from "@authgear/web";

const startLogin = () => {
  authgear
    .startAuthentication({
      redirectURI: "http://localhost:4000/auth-redirect",
      prompt: "login",
    })
    .then(
      () => {
        // started authorization, user should be redirected to Authgear
      },
      (err) => {
        // failed to start authorization
        console.error(err);
      }
    );
};
</script>

<template>
  <h1>Home Page</h1>
  <button @click="startLogin">Login</button>
</template>

You can now run npm run dev and you will be redirected to the Authgear Login page when you click the Login button.

Step 8: Show the user information

The Authgear SDK helps you get the information of the logged in users easily.

In the last step, the user is successfully logged in so let's try to print the user ID (sub) of the user in the Home page.

In Home.vue, we will add a simple Loading splash and a greeting message printing the Sub ID. We will add two conditional elements such that they are only shown when user is logged in. We can also change the login button to show only if the user is not logged in.

Make use of isLoggedIn from the UserProvider to control the components on the page. Fetch the user info by fetchInfo() and access its sub property.

The Login button can be also rendered conditionally which only visible if the user is not logged in. 

// src/components/Home.vue  
<script setup lang="ts">
import authgear from "@authgear/web";
import { inject, onMounted, ref } from "vue";
import { UserStateSymbol } from "../contexts/UserProvider.vue";

const { isLoggedIn } = inject(UserStateSymbol)!;
const isLoading = ref(false);
const greetingMessage = ref("");

onMounted(() => {
  async function updateGreetingMessage() {
    isLoading.value = true;
    try {
      if (isLoggedIn.value) {
        const userInfo = await authgear.fetchUserInfo();
        greetingMessage.value = "The current User sub: " + userInfo.sub;
      }
    } finally {
      isLoading.value = false;
    }
  }

  updateGreetingMessage().catch((e) => {
    console.error(e);
  });
});

const startLogin = () => {
  authgear
    .startAuthentication({
      redirectURI: "http://localhost:4000/auth-redirect",
      prompt: "login",
    })
    .then(
      () => {
        // started authorization, user should be redirected to Authgear
      },
      (err) => {
        // failed to start authorization
        console.error(err);
      }
    );
};
</script>

<template>
  <h1>Home Page</h1>
  <span v-if="isLoading">Loading...</span>
  <span v-if="greetingMessage">{{ greetingMessage }}</span>
  <div v-if="!isLoggedIn">
    <button @click="startLogin">Login</button>
  </div>
</template>

Run the app again, the User ID (sub) of the user should be printed on the Home page.

Step 9: Add a Logout button

Finally, let's add an Logout button when user is logged in.

In Home.vue, we will add a conditional elements in the template:

<div v-if="isLoggedIn">
  <button @click="logout">Logout</button>
</div>

And add the logout callback:

const logout = () => {
  authgear
    .logout({
      redirectURI: "http://localhost:4000/",
    })
    .then(
      () => {
        greetingMessage.value = "";
      },
      (err) => {
        console.error(err);
      }
    );
};

Run the app again, we can now logout by clicking the logout button.

Step 10: Open User Settings

Authgear provide a built-in UI for the users to set their attributes and change security settings.

Use the open function to open the setting page at <your_app_endpoint>/settings

In Home.vue append a conditional link to the logout button section.

<div v-if="isLoggedIn">
  <button @click="logout()">Logout</button>
  <br />
  <a
    target="_blank"
    rel="noreferrer"
    @click.stop.prevent="userSetting"
    href="#"
  >
    User Setting
  </a>
</div>

And add the userSetting callback:

import authgear, { Page } from "@authgear/web";

const userSetting = async () => {
  await authgear.open(Page.Settings);
};

This the the resulting Home.vue:

// src/components/Home.vue
<script setup lang="ts">
import authgear, { Page } from "@authgear/web";
import { inject, onMounted, ref } from "vue";
import { UserStateSymbol } from "../contexts/UserProvider.vue";

const { isLoggedIn } = inject(UserStateSymbol)!;
const isLoading = ref(false);
const greetingMessage = ref("");

onMounted(() => {
  async function updateGreetingMessage() {
    isLoading.value = true;
    try {
      if (isLoggedIn.value) {
        const userInfo = await authgear.fetchUserInfo();
        greetingMessage.value = "The current User sub: " + userInfo.sub;
      }
    } finally {
      isLoading.value = false;
    }
  }

  updateGreetingMessage().catch((e) => {
    console.error(e);
  });
});

const startLogin = () => {
  authgear
    .startAuthentication({
      redirectURI: "http://localhost:4000/auth-redirect",
      prompt: "login",
    })
    .then(
      () => {
        // started authorization, user should be redirected to Authgear
      },
      (err) => {
        // failed to start authorization
        console.error(err);
      }
    );
};

const logout = () => {
  authgear
    .logout({
      redirectURI: "http://localhost:4000/",
    })
    .then(
      () => {
        greetingMessage.value = "";
      },
      (err) => {
        console.error(err);
      }
    );
};

const userSetting = async () => {
  await authgear.open(Page.Settings);
};
</script>

<template>
  <h1>Home Page</h1>
  <span v-if="isLoading">Loading...</span>
  <span v-if="greetingMessage">{{ greetingMessage }}</span>
  <div v-if="!isLoggedIn">
    <button @click="startLogin">Login</button>
  </div>
  <div v-if="isLoggedIn">
    <button @click="logout">Logout</button>
    <br />
    <a
      target="_blank"
      rel="noreferrer"
      @click.stop.prevent="userSetting"
      href="#"
    >
      User Setting
    </a>
  </div>
</template>

Next steps, Calling an API

To access restricted resources on your backend application server, the HTTP requests should include the access token in their Authorization headers. The Web SDK provides a fetch function which automatically handle this, or you can get the token with authgear.accessToken.

Option 1: Using fetch function provided by Authgear SDK

Authgear SDK provides the fetch function for you to call your application server. This fetch function will include the Authorization header in your application request, and handle refresh access token automatically. The authgear.fetch implements fetch.

authgear
    .fetch("YOUR_SERVER_URL")
    .then(response => response.json())
    .then(data => console.log(data));

Option 2: Add the access token to the HTTP request header

You can get the access token through authgear.accessToken. Call refreshAccessTokenIfNeeded every time before using the access token, the function will check and make the network call only if the access token has expired. Include the access token into the Authorization header of the application request.

authgear
    .refreshAccessTokenIfNeeded()
    .then(() => {
        // access token is ready to use
        // accessToken can be string or undefined
        // it will be empty if user is not logged in or session is invalid
        const accessToken = authgear.accessToken;

        // include Authorization header in your application request
        const headers = {
            Authorization: `Bearer ${accessToken}`
        };
    });
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