How to logout once jwt token is expired

Question

I am working on a web-app using node.js and vue.js, I am doing authentication and maintaining session using jwt and passport.js using passport-jwtstrategy

I have done all the things from creating jwt to protecting routes all the things now my issue is while generating jwt I am passing expiresIn:3600 so I want to auto-logout my user from Ui and remove token from localStorage once it has been one hour

On decoding my jwt I am getting

 {
  "name": "Dheeraj",
  "iat": 1571896207,
  "exp": 1571899807
}

So how can I get the real-time when to logout

In my auth.js vue store file my logout code when user clicks on logout is

logout({ commit }) {
        return new Promise((resolve, reject) => {
            localStorage.removeItem('jwt-token')
            localStorage.removeItem('user-name')
            commit('setAuthUser', null)
            resolve(true)
        })

    },

In the same file, I have a method getAuthUser which is running whenever a page is loading or reloading to check to protect rout and guestUser

getAuthUser({ commit, getters }) {
        const authUser = getters['authUser']
        const token = localStorage.getItem('jwt-token')
        const isTokenValid = checkTokenValidity(token)
        if (authUser && isTokenValid) {
            return Promise.resolve(authUser)
        }

        commit('setAuthUser', token)
        commit('setAuthState', true)
        debugger
        return token


    }

So how can I logout once my token is expired Anyone out here please guide me how can I logout once the token is expired

Edit

In my router.js file

router.beforeEach((to, from, next) => {
store.dispatch('auth/getAuthUser')
    .then((authUser) => {
        const isAuthenticated = store.getters['auth/isAuthenticated']

        if (to.meta.onlyAuthUser) {
            if (isAuthenticated) {
                next()
            } else {
                next({ name: 'login' })
            }
        } else if (to.meta.onlyGuestUser) {
            if (isAuthenticated) {
                next({ name: 'welcome' })
            } else {
                next()
            }
        } else {
            next()
        }
    })

})

from my auth file I am calling get authUser which I have already mention above

for checking token validity I am using this code

function checkTokenValidity(token) {
if (token) {
    const decodedToken = jwt.decode(token)
    return decodedToken && (decodedToken.exp * 1000) > new Date().getTime()

}
return false

}

but it returns false when I am on login page and there is no token there but once I am loged in it shows null

My global api file

    import axios from 'axios';

export default () => {
    let headers = {
        'cache-control': 'no-cache'
    };
    let accessToken = localStorage.getItem('jwt-token');

    if (accessToken && accessToken !== '') {
        headers.Authorization = accessToken;

    };
    return axios.create({
        baseURL: 'http://localhost:8086/',
        headers: headers
    });
}

Answer 1

Refer to the axios documentataion: https://github.com/axios/axios

import axios from 'axios';

export default () => {
    let headers = {
        'cache-control': 'no-cache'
    };
    let accessToken = localStorage.getItem('jwt-token');

    if (accessToken && accessToken !== '') {
        headers.Authorization = accessToken;

    };
    const instance = axios.create({
        baseURL: 'http://localhost:8086/',
        headers: headers
    });

    instance.interceptors.response.use((response) => {
        if(response.status === 401) {
             //add your code
             alert("You are not authorized");
        }
        return response;
    }, (error) => {
        if (error.response && error.response.data) {
             //add your code
             return Promise.reject(error.response.data);
        }
        return Promise.reject(error.message);
    });

    return instance;
}