Authorize Reactjs Pages

I have learned allot of the authentication like JWT and session cookie from the back-end side

but I would Like to know how to authorize a page for some that is not logged in and Redirect to the login page. I know that after succesfull login, you first have to fetch user data from the database. and then maybe keep that data in Reactjs… Like how does something like that work?

maybe doing a if statement after receiving the login like:

if(login == ’ ')
redirect to other page
allowed to enter

im a just guessing…

in the asp net core Reactjs template i saw some a “authService” function
is that required as well?

Can some one give an example and tell me how to deal with this


is there any one that can help me?

You are asking for implementation detail examples without providing any information about your actual implementation. Any examples given would be specific to some implementation.

Did you try searching for this question? Because I feel like there is a lot of articles and tutorials on this out there.

I have searched allot on this topic but its either done with NodeJS wich i do not use
and about 90% is explaining how JWT works wich i already understand.
I just want to know how to authorize from a Client side like a reactJS framework
even on the React website it self it says very little.

the Asp net core React authentication template is kind of hard to understand if you dont understand how these functions work.

I just want to know how to authorize a webpage for users that are not logged in and redirect them thats all.

You can’t do that on the client side alone. You need a backend/a server that checks whether the user has entered a correct username/password combination. That code cannot run on the client. The client is the one who asks for permission, the server checks if that permission should be granted. If yes, the server will respond with (for example) an access token.

This is the second time you have referred to this. I don’t know what that is, at least not off the top of my head. Unless you provide some more information I would have to spend time trying to figure it out.

I don’t know anything about your current implementation. If you are asking for help using a specific auth implementation you have to provide that information and preferably show us what you have right now.

Like I said, how you do it is largely an implementation detail. We would need to know how you are doing the authentication.

However, any documentation, articles, tutorials would have some common code. They might do it differently depending on how you want to check for the “token” and redirect to the login page, but all of them should have React code that shows some ways of doing it. They might conditionally render something, or use a client-side router, or maybe just use the browser API. Again, this is an implementation detail that can and will vary.

You need a backend/a server that checks whether the user has entered a correct username/password combination

I understand backend coding and how to verify a user account,
The acces token from the client side is what i do not understand and how reactjs would handle that. I am very interested to see how it would work

there are many articles out there and it is getting a bit confusing to follow, many services like Auth0 are all over the place.

I have got some code from the React Template wich i dont not really understand that well it is also done with classes instead of hooks , I also think the following code could be writen much more simpler wich would make it easier to understand :


import React, { Component } from 'react';
import { Route } from 'react-router';
import { Layout } from './components/Layout';
import { Home } from './components/Home';
import { FetchData } from './components/FetchData';
import { Counter } from './components/Counter';
import AuthorizeRoute from './components/api-authorization/AuthorizeRoute';
import ApiAuthorizationRoutes from './components/api-authorization/ApiAuthorizationRoutes';
import { ApplicationPaths } from './components/api-authorization/ApiAuthorizationConstants';

import './custom.css'

export default class App extends Component {
  static displayName =;

  render () {
    return (
        <Route exact path='/' component={Home} />
        < Route path='/counter' component={Counter} />
        <AuthorizeRoute path='/fetch-data' component={FetchData} />
        <Route path={ApplicationPaths.ApiAuthorizationPrefix} component={ApiAuthorizationRoutes} />


import React from 'react'
import { Component } from 'react'
import { Route, Redirect } from 'react-router-dom'
import { ApplicationPaths, QueryParameterNames } from './ApiAuthorizationConstants'
import authService from './AuthorizeService'

export default class AuthorizeRoute extends Component {
    constructor(props) {

        this.state = {
            ready: false,
            authenticated: false

    componentDidMount() {
        this._subscription = authService.subscribe(() => this.authenticationChanged());

    componentWillUnmount() {

    render() {
        const { ready, authenticated } = this.state;
        var link = document.createElement("a");
        link.href = this.props.path;
        const returnUrl = `${link.protocol}//${}${link.pathname}${}${link.hash}`;
        const redirectUrl = `${ApplicationPaths.Login}?${QueryParameterNames.ReturnUrl}=${encodeURIComponent(returnUrl)}`
        if (!ready) {
            return <div></div>;
        } else {
            const { component: Component, } = this.props;
            return <Route {}
                render={(props) => {
                    if (authenticated) {
                        return <Component {...props} />
                    } else {
                        return <Redirect to={redirectUrl} />
                }} />

    async populateAuthenticationState() {
        const authenticated = await authService.isAuthenticated();
        this.setState({ ready: true, authenticated });

    async authenticationChanged() {
        this.setState({ ready: false, authenticated: false });
        await this.populateAuthenticationState();

AuthorizeService.js :

import { UserManager, WebStorageStateStore } from 'oidc-client';
import { ApplicationPaths, ApplicationName } from './ApiAuthorizationConstants';

export class AuthorizeService {
    _callbacks = [];
    _nextSubscriptionId = 0;
    _user = null;
    _isAuthenticated = false;

    // By default pop ups are disabled because they don't work properly on Edge.
    // If you want to enable pop up authentication simply set this flag to false.
    _popUpDisabled = true;

    async isAuthenticated() {
        const user = await this.getUser();
        return !!user;

    async getUser() {
        if (this._user && this._user.profile) {
            return this._user.profile;

        await this.ensureUserManagerInitialized();
        const user = await this.userManager.getUser();
        return user && user.profile;

    async getAccessToken() {
        await this.ensureUserManagerInitialized();
        const user = await this.userManager.getUser();
        return user && user.access_token;

    // We try to authenticate the user in three different ways:
    // 1) We try to see if we can authenticate the user silently. This happens
    //    when the user is already logged in on the IdP and is done using a hidden iframe
    //    on the client.
    // 2) We try to authenticate the user using a PopUp Window. This might fail if there is a
    //    Pop-Up blocker or the user has disabled PopUps.
    // 3) If the two methods above fail, we redirect the browser to the IdP to perform a traditional
    //    redirect flow.
    async signIn(state) {
        await this.ensureUserManagerInitialized();
        try {
            const silentUser = await this.userManager.signinSilent(this.createArguments());
            return this.success(state);
        } catch (silentError) {
            // User might not be authenticated, fallback to popup authentication
            console.log("Silent authentication error: ", silentError);

            try {
                if (this._popUpDisabled) {
                    throw new Error('Popup disabled. Change \'AuthorizeService.js:AuthorizeService._popupDisabled\' to false to enable it.')

                const popUpUser = await this.userManager.signinPopup(this.createArguments());
                return this.success(state);
            } catch (popUpError) {
                if (popUpError.message === "Popup window closed") {
                    // The user explicitly cancelled the login action by closing an opened popup.
                    return this.error("The user closed the window.");
                } else if (!this._popUpDisabled) {
                    console.log("Popup authentication error: ", popUpError);

                // PopUps might be blocked by the user, fallback to redirect
                try {
                    await this.userManager.signinRedirect(this.createArguments(state));
                    return this.redirect();
                } catch (redirectError) {
                    console.log("Redirect authentication error: ", redirectError);
                    return this.error(redirectError);

    async completeSignIn(url) {
        try {
            await this.ensureUserManagerInitialized();
            const user = await this.userManager.signinCallback(url);
            return this.success(user && user.state);
        } catch (error) {
            console.log('There was an error signing in: ', error);
            return this.error('There was an error signing in.');

    // We try to sign out the user in two different ways:
    // 1) We try to do a sign-out using a PopUp Window. This might fail if there is a
    //    Pop-Up blocker or the user has disabled PopUps.
    // 2) If the method above fails, we redirect the browser to the IdP to perform a traditional
    //    post logout redirect flow.
    async signOut(state) {
        await this.ensureUserManagerInitialized();
        try {
            if (this._popUpDisabled) {
                throw new Error('Popup disabled. Change \'AuthorizeService.js:AuthorizeService._popupDisabled\' to false to enable it.')

            await this.userManager.signoutPopup(this.createArguments());
            return this.success(state);
        } catch (popupSignOutError) {
            console.log("Popup signout error: ", popupSignOutError);
            try {
                await this.userManager.signoutRedirect(this.createArguments(state));
                return this.redirect();
            } catch (redirectSignOutError) {
                console.log("Redirect signout error: ", redirectSignOutError);
                return this.error(redirectSignOutError);

    async completeSignOut(url) {
        await this.ensureUserManagerInitialized();
        try {
            const response = await this.userManager.signoutCallback(url);
            return this.success(response &&;
        } catch (error) {
            console.log(`There was an error trying to log out '${error}'.`);
            return this.error(error);

    updateState(user) {
        this._user = user;
        this._isAuthenticated = !!this._user;

    subscribe(callback) {
        this._callbacks.push({ callback, subscription: this._nextSubscriptionId++ });
        return this._nextSubscriptionId - 1;

    unsubscribe(subscriptionId) {
        const subscriptionIndex = this._callbacks
            .map((element, index) => element.subscription === subscriptionId ? { found: true, index } : { found: false })
            .filter(element => element.found === true);
        if (subscriptionIndex.length !== 1) {
            throw new Error(`Found an invalid number of subscriptions ${subscriptionIndex.length}`);

        this._callbacks.splice(subscriptionIndex[0].index, 1);

    notifySubscribers() {
        for (let i = 0; i < this._callbacks.length; i++) {
            const callback = this._callbacks[i].callback;

    createArguments(state) {
        return { useReplaceToNavigate: true, data: state };

    error(message) {
        return { status: AuthenticationResultStatus.Fail, message };

    success(state) {
        return { status: AuthenticationResultStatus.Success, state };

    redirect() {
        return { status: AuthenticationResultStatus.Redirect };

    async ensureUserManagerInitialized() {
        if (this.userManager !== undefined) {

        let response = await fetch(ApplicationPaths.ApiAuthorizationClientConfigurationUrl);
        if (!response.ok) {
            throw new Error(`Could not load settings for '${ApplicationName}'`);

        let settings = await response.json();
        settings.automaticSilentRenew = true;
        settings.includeIdTokenInSilentRenew = true;
        settings.userStore = new WebStorageStateStore({
            prefix: ApplicationName

        this.userManager = new UserManager(settings); () => {
            await this.userManager.removeUser();

    static get instance() { return authService }

const authService = new AuthorizeService();

export default authService;

export const AuthenticationResultStatus = {
    Redirect: 'redirect',
    Success: 'success',
    Fail: 'fail'

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