Sample Project

Download a sample project specific to this tutorial configured with your Auth0 API Keys.

System Requirements
  • PHP v5
  • Composer 1.0
Show requirements

This tutorial shows you how to use the authorization features in the OAuth 2.0 framework to limit access to your or third-party applications. For more information, read the API authorization documentation.

Create a Resource Server (API)

In the APIs section of the Auth0 dashboard, click Create API. Provide a name and an identifier for your API. You will use the identifier as an audience later, when you are configuring the access token verification. For Signing Algorithm, select RS256.

Create API

Add API Authorization

To restrict access to the resources served by your API, check the incoming requests for valid authorization information. The authorization information is stored in the access token created for the user and needs to be sent in the Authorization header. To see if the token is valid, check it against the JSON Web Key Set (JWKS) for your Auth0 account. To learn more about validating access tokens, read the Verify Access Tokens tutorial.

This sample demonstrates how to check for a JWT in the Authorization header of an incoming HTTP request and verify that it is valid. The validity check is done in the JWTVerifier class from the auth0-PHP library which can be applied to any endpoints you wish to protect. If the token is valid, the resources which are served by the endpoint can be released, otherwise a 401 Authorization error will be returned.

Install the Dependencies

The auth0-PHP library and its JWTVerifier class can be used to verify incoming JWTs. The router library can be used to create simple routes. Install the libraries with composer.

composer require bramus/router:dev-master auth0/auth0-php:~5.0


By default, your API uses RS256 as the algorithm for signing tokens. Since RS256 uses a private/public keypair, it verifies the tokens against the public key for your Auth0 account. You can access this public key here.

We recommend using the default RS256 signing algorithm for your API. If you need to use the HS256 algorithm, see the HS256 integration sample.

Create an instance of JWTVerifier and pass your API identifier to valid_audiences and your Auth0 domain to authorized_iss. You can also create a function which will be called to return a message when a request is made to a protected endpoint.

// src/Main.php


namespace App;

use Auth0\SDK\JWTVerifier;

class Main {

  protected $token;
  protected $tokenInfo;

  public function setCurrentToken($token) {

      try {
        $verifier = new JWTVerifier([
          'supported_algs' => ['RS256'],
          'valid_audiences' => ['{YOUR_API_IDENTIFIER}'],
          'authorized_iss' => ['https://YOUR_AUTH0_DOMAIN/']

        $this->token = $token;
        $this->tokenInfo = $verifier->verifyAndDecode($token);
      catch(\Auth0\SDK\Exception\CoreException $e) {
        throw $e;

  public function privatePing() {
      return array(
          "status" => "ok",
          "message" => "Hello from a private endpoint! You DO need to be authenticated to see this."


Configure Authenticated Routes

The before hook from the router package can be used to configure which routes are to be protected. For example, you may wish to protect all routes under a URL of /api/private.

// index.php

// ...
// Require composer autoloader
require __DIR__ . '/vendor/autoload.php';

// Read .env
try {
  $dotenv = new Dotenv\Dotenv(__DIR__);
} catch(InvalidArgumentException $ex) {
  // Ignore if no dotenv

$app = new \App\Main();

// Create Router instance
$router = new \Bramus\Router\Router();

// Activate CORS
function sendCorsHeaders() {
  header("Access-Control-Allow-Origin: *");
  header("Access-Control-Allow-Headers: Authorization");
  header("Access-Control-Allow-Methods: GET,HEAD,PUT,PATCH,POST,DELETE");

$router->options('/.*', function() {


// Check JWT on /secured routes
$router->before('GET', '/api/private/.*', function() use ($app) {

  $requestHeaders = apache_request_headers();

  if (!isset($requestHeaders['authorization']) && !isset($requestHeaders['Authorization'])) {
      header('HTTP/1.0 401 Unauthorized');
      echo "No token provided.";

  $authorizationHeader = isset($requestHeaders['authorization']) ? $requestHeaders['authorization'] : $requestHeaders['Authorization'];

  if ($authorizationHeader == null) {
    header('HTTP/1.0 401 Unauthorized');
    echo "No authorization header sent";

  $authorizationHeader = str_replace('bearer ', '', $authorizationHeader);
  $token = str_replace('Bearer ', '', $authorizationHeader);

  try {
  catch(\Auth0\SDK\Exception\CoreException $e) {
    header('HTTP/1.0 401 Unauthorized');
    echo $e;


With this configuration, any time an endpoint which includes /api/private is reached, a valid JWT access_token will be required before the resource can be released. With this in place, private routes can be defined.

// index.php

$router->get('/api/private/ping', function() use ($app){
    echo json_encode($app->privatePing());

Make a Call to Your API

To make calls to your API, you need an access token. You can get an access token for testing purposes from the test lab in your API settings.

Obtain a JWT

Provide the access token as an Authorization header in your requests.

curl --request GET \
  --url \
  --header 'authorization: Bearer YOUR_ACCESS_TOKEN_HERE'
var client = new RestClient("");
var request = new RestRequest(Method.GET);
request.AddHeader("authorization", "Bearer YOUR_ACCESS_TOKEN_HERE");
IRestResponse response = client.Execute(request);
package main

import (

func main() {

	url := ""

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("authorization", "Bearer YOUR_ACCESS_TOKEN_HERE")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := ioutil.ReadAll(res.Body)


HttpResponse<String> response = Unirest.get("")
  .header("authorization", "Bearer YOUR_ACCESS_TOKEN_HERE")
var settings = {
  "async": true,
  "crossDomain": true,
  "url": "",
  "method": "GET",
  "headers": {
    "authorization": "Bearer YOUR_ACCESS_TOKEN_HERE"

$.ajax(settings).done(function (response) {
var request = require("request");

var options = { method: 'GET',
  url: '',
  headers: { authorization: 'Bearer YOUR_ACCESS_TOKEN_HERE' } };

request(options, function (error, response, body) {
  if (error) throw new Error(error);

#import <Foundation/Foundation.h>

NSDictionary *headers = @{ @"authorization": @"Bearer YOUR_ACCESS_TOKEN_HERE" };

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@""]
[request setHTTPMethod:@"GET"];
[request setAllHTTPHeaderFields:headers];

NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request
                                            completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
                                                if (error) {
                                                    NSLog(@"%@", error);
                                                } else {
                                                    NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;
                                                    NSLog(@"%@", httpResponse);
[dataTask resume];
$curl = curl_init();

curl_setopt_array($curl, array(
  CURLOPT_URL => "",
    "authorization: Bearer YOUR_ACCESS_TOKEN_HERE"

$response = curl_exec($curl);
$err = curl_error($curl);


if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
import http.client

conn = http.client.HTTPConnection("")

headers = { 'authorization': "Bearer YOUR_ACCESS_TOKEN_HERE" }

conn.request("GET", "/api_path", headers=headers)

res = conn.getresponse()
data =

require 'uri'
require 'net/http'

url = URI("")

http =, url.port)

request =
request["authorization"] = 'Bearer YOUR_ACCESS_TOKEN_HERE'

response = http.request(request)
puts response.read_body
import Foundation

let headers = ["authorization": "Bearer YOUR_ACCESS_TOKEN_HERE"]

var request = NSMutableURLRequest(URL: NSURL(string: "")!,
                                        cachePolicy: .UseProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.HTTPMethod = "GET"
request.allHTTPHeaderFields = headers

let session = NSURLSession.sharedSession()
let dataTask = session.dataTaskWithRequest(request, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
  } else {
    let httpResponse = response as? NSHTTPURLResponse


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