Local

Source Code

local is the default, credentials/token based scheme for flows like JWT.

Note: You can use cookie scheme which is based on local but modified for cookie based APIs.

By default local scheme is enabled and preconfigured. You can set strategies.local to false to disable it.

Usage

To do a password based login by sending credentials in request body as a JSON object:

<template>
  <div>
    <form @submit.prevent="userLogin">
      <div>
        <label>Username</label>
        <input type="text" v-model="login.username" />
      </div>
      <div>
        <label>Password</label>
        <input type="password" v-model="login.password" />
      </div>
      <div>
        <button type="submit">Submit</button>
      </div>
    </form>
  </div>
</template>

<script>
export default {
  data() {
    return {
      login: {
        username: '',
        password: ''
      }
    }
  },
  methods: {
    async userLogin() {
      try {
        const response = await this.$auth.loginWith('local', {
          data: this.login
        })
        console.log(response)
      } catch (err) {
        console.log(err)
      }
    }
  }
}
</script>

Backend

You'll need a backend server that implement the basics of authentication. As this is very security-sensitive code, we strongly recommend that you use an established authentication library for your backend, too.

The backend will, at minimum, need to handle login and logout. It will also, by default, need to include an endpoint to fetch user information (ID, email, etc). This can be disabled with endpoints.user = false if your frontend doesn't need to know anything about your user. In this case, this.$auth.user will be {}.

Login

The backend should verify the login credentials, then return a JSON body with the token that the frontend can use to act as this user. The JSON body format is configured in the token section of the local scheme configuration.

TIP: If you want to use cookies instead of token-based authentication, use the cookie scheme.

The entire backend response is passed through to the loginWith response, so you can pass through additional information about the user, e.g. for authorization (which is out of scope of @nuxtjs/auth).

Fetch User

The auth module does not persist information about the user, so there needs to be a way to fetch the user's information on e.g. page reload. That's what the user endpoint is for. By default, this is also called after a successful login.

If user.autoFetch is true (default), then a request to endpoints.user is sent immediately after a successful login. That endpoint should respond with the JSON information for a specific user, which is assigned directly to the user property.

If you'd prefer to return the user's information directly from the login session, configure user.autoFetch to false, fetch the user information from the loginWith response, and pass it in to setUser.

If you want to disable fetching user info entirely, set endpoints.user: false. This will mean the user info endpoint is never called, but will also mean the frontend doesn't know anything about the user; this.$auth.user will be {}.

Options

Example for a token based flow:

auth: {
  strategies: {
    local: {
      token: {
        property: 'token',
        global: true,
        // required: true,
        // type: 'Bearer'
      },
      user: {
        property: 'user',
        // autoFetch: true
      },
      endpoints: {
        login: { url: '/api/auth/login', method: 'post' },
        logout: { url: '/api/auth/logout', method: 'post' },
        user: { url: '/api/auth/user', method: 'get' }
      }
    }
  }
}

Example for a cookie based flow:

auth: {
  strategies: {
    local: {
      token: {
        required: false,
        type: false
      },
      endpoints: {
        login: { url: '/api/auth/login', method: 'post' },
      }
    }
  }
}

endpoints

Each endpoint is used to make requests using axios. They are basically extending Axios Request Config.

::: tip To disable each endpoint, simply set its value to false. :::

token

Here you configure the token options.

property

property can be used to specify which field of the response JSON to be used for value. It can be false to directly use API response or being more complicated like auth.token.

prefix

• Default: _token.

prefix sets the token prefix in the state.

Note: if you are using vuex, the token will only appear in the auth state if the prefix does not start with an underscore (_).

required

• Default: true

This option can be used to disable all token handling.

::: tip Useful for Cookie only flows. :::

global

• Default: true

This determines if the authentication token is automatically included in all custom axios requests.

name

• Default: Authorization

Authorization header name to be used in axios requests.

type

• Default: Bearer

Authorization header type to be used in axios requests.

maxAge

• Default: 1800

Here you set the expiration time of the token, in seconds. This time will be used if for some reason we couldn't decode the token to get the expiration date.

By default is set to 30 minutes.

user

Here you configure the user options. Note that these options should be set in local.user and not in the user endpoints options (local.endpoints.user). Refer to the example above for further clarification.

property

property can be used to specify which field of the response JSON to be used for value. It can be false to directly use API response or being more complicated like auth.user.

autoFetch

• Default: true

By default, auth will load the user's info using a second HTTP request after a successful login. This option disables that request, but does not disable fetching user info from the user endpoint; set endpoints.user: false for that.

TIP: Set this to false when you want to return the user info from your login request to save an extra HTTP roundtrip. To do so, get the response from loginWith and pass the data to setUser. Note that, unless you disable the user endpoint with endpoints.user: false you will still need to implement the user endpoint so that auth can fetch the user information on e.g. page refresh.

clientId

• Default: false

If your backend requires client id, it can be set here.

grantType

• Default: false

If your backend requires grant type, it can be set here.

scope

• Default: false

If your backend requires scope, it can be set here.