SDK Backend Protection

Control access to your backend using one of the Frontegg SDKs. When your routes receive API calls, Frontegg's SDK checks the caller's identity and only gives access if the caller is authorized to access the route based on their roles or permissions.

Step-By-Step Guide

Step 1: Protect Backend Routes

Protect your routes with the withAuthentication middleware from one of the Frontegg SDKs. For each route, decide whether to allow access to all authenticated users or just a limited subset of authenticated users.


Frontegg SDKs

Frontegg offers SDKs in several languages, including the Frontegg SDK for node.js and the Frontegg SDK for Python (Flask & FastAPI).

Check the relevant package for information how to initialize Frontegg on the backend.

Review the Supported Frameworks to see a list of frameworks you can use.

Regardless of which SDK you use, after installing it, you need to set the Frontegg client ID and Frontegg API key as backend environment variables.


All Authenticated Users

Use the withAuthentication hook to control who can access your routes. For instance, use the following code to allow access to authenticated users only.

const { withAuthentication } = require('@frontegg/client');


app.use('/shift', withAuthentication());
from frontegg.flask.secure_access import with_authentication


def cool():
    return g.user


Important note on API regions!

By default, the withAuthentication hook calls (our EU region)

If your account is on the US region, you need to add the following environment variable:

Grant Access by Roles

Instead of allowing all authenticated users, choose which authenticated users can access your routes based on the user's roles.

Single Role

Allow only a single role to access a route by telling the withAuthentication hook which role is allowed. Use the role key and set its value to an array of one role name. Here is an example.

app.use('/admin', withAuthentication({ roles: ['admin'] }));
def get_authorized():
    return g.user

Multiple Roles

Allow multiple roles to access a route by telling the withAuthentication hook which roles can access the route. Instead of including a single role, you list multiple inside the array of roles.

app.use('/home', withAuthentication({ roles: ['admin', 'read-only'] }));
@with_authentication(role_keys=['admin', 'read-only'])
def get_home():
    return g.user

Grant Access by Permissions

Choose which authenticated users can access your routes based on the user's permissions.

Single Permission

Grant access to users who have a specific permission by telling the withAuthentication hook which permissions are allowed. Use the permissions key and set its value to an array of one permission name. Your route will only grant access to users with that permission.

app.use('/uploads', withAuthentication({ permissions: ['uploadFile'] }));
def cool():
    return g.user

Multiple Permissions

Allow multiple permissions to access a route by telling the withAuthentication which permissions are allowed. Instead of including a single permission, you list multiple inside the array of permissions.

If you list multiple permissions, then any user who has one or more of those permissions will be granted access.

Step 2: Send Access Token From Frontend

To access a protected route from your frontend application, you need to append an Authorization Bearer Token as a header in your GET requests. The token is available as an accessToken property of the user object, as shown below.

fetch('http://localhost:8080/shift', { // Your server's secured endpoint
  method: 'GET',
  headers: {
    Authorization: `Bearer ${user.accessToken}`,


The withAuthentication middleware processes the authorization Bearer header and validates the JWT.

Upon successful authorization, the user context and the entire authentication context are available from the Frontegg SDKs. See the examples below.

import { useAuth } from '@frontegg/react';
const { user, isAuthenticated } = useAuth();
import { Component, OnInit } from '@angular/core';
import { AuthService } from '@frontegg/ng-auth';

  selector: 'app-home',
  templateUrl: './home.component.html',
export class HomeComponent implements OnInit {
  user = null;

  constructor(public authService: AuthService) {
    this.user = authService.user$;

  ngOnInit(): void { }
  <div id="app" v-if="fronteggLoaded">
    <div v-if="this.authState.user">
      <span>Logged in as: {{}}</span>

export default {
  name: "App",
  data() {
    return {