student-client/src/router.js

import Vue from "vue";
import Router from "vue-router";
import Home from "./views/Home.vue";
import About from "./views/About.vue";

import NotFoundComponent from "./views/NotFoundComponent.vue";
import OnlineExamHome from "./features/OnlineExam/OnlineExamHome.vue";
import Login from "./features/login/Login.vue";

Vue.use(Router);
let router = new Router({
  mode: "history",
  routes: [{
      path: "/",
      name: "home",
      component: Home
    },
    {
      path: "/about",
      name: "about",
      component: About
    },
    {
      path: "/login",
      name: "login",
      component: Login
    },
    {
      path: "/online-exam",
      name: "OnlineExamHome",
      component: OnlineExamHome
    },
    {
      path: "/online-exam",
      name: "OnlineExamHome",
      component: OnlineExamHome
    },
    {
      path: "*",
      component: NotFoundComponent
    }
  ]
});

router.beforeEach((to, from, next) => {
  debugger
  if (to.path === "/login") {
    next();
  } else {
    if (!window.localStorage.getItem("token")) {
      next({
        path: "/login"
      })
    } else {
      next();
    }
  }
});

export default router;