Embedded Passwordless Login in Regular Web Applications

To use the Embedded Passwordless APIs in Regular Web Applications, make sure you enable the Passwordless OTP grant at Auth0 Dashboard > Applications > Applications in your application's settings under Advanced Settings > Grant Types.

Passwordless authentication for Regular Web Applications consists of two steps:

  1. Capture the user identifier in your application (the user's email or phone number) and invoke the /passwordless/start endpoint to initiate the passwordless flow. The user will get an email, an SMS with a one-time-use code, or a magic link.

  2. If you did not send a magic link, prompt the user for the one-time-use code, and call the /oauth/token endpoint to get authentication tokens.

Note that when using magic links, you don't need to call /oauth/token. The user will click the magic link and be redirected to the application's callback URL.

Below, we list a few code snippets that can be used to call these API endpoints for different scenarios.

Send a one-time-use code via email




  


  
  
curl --request POST \
  --url 'https://{yourDomain}/passwordless/start' \
  --header 'content-type: application/json' \
  --data '{"client_id": "{yourClientId}", "client_secret": "{yourClientSecret}", "connection": "email", "email": "{userEmail}","send": "code"}'
Was this helpful?
/
var client = new RestClient("https://{yourDomain}/passwordless/start");
var request = new RestRequest(Method.POST);
request.AddHeader("content-type", "application/json");
request.AddParameter("application/json", "{\"client_id\": \"{yourClientId}\", \"client_secret\": \"{yourClientSecret}\", \"connection\": \"email\", \"email\": \"{userEmail}\",\"send\": \"code\"}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
Was this helpful?
/
package main

import (
	"fmt"
	"strings"
	"net/http"
	"io/ioutil"
)

func main() {

	url := "https://{yourDomain}/passwordless/start"

	payload := strings.NewReader("{\"client_id\": \"{yourClientId}\", \"client_secret\": \"{yourClientSecret}\", \"connection\": \"email\", \"email\": \"{userEmail}\",\"send\": \"code\"}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("content-type", "application/json")

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

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

	fmt.Println(res)
	fmt.Println(string(body))

}
Was this helpful?
/
HttpResponse<String> response = Unirest.post("https://{yourDomain}/passwordless/start")
  .header("content-type", "application/json")
  .body("{\"client_id\": \"{yourClientId}\", \"client_secret\": \"{yourClientSecret}\", \"connection\": \"email\", \"email\": \"{userEmail}\",\"send\": \"code\"}")
  .asString();
Was this helpful?
/
var axios = require("axios").default;

var options = {
  method: 'POST',
  url: 'https://{yourDomain}/passwordless/start',
  headers: {'content-type': 'application/json'},
  data: {
    client_id: '{yourClientId}',
    client_secret: '{yourClientSecret}',
    connection: 'email',
    email: '{userEmail}',
    send: 'code'
  }
};

axios.request(options).then(function (response) {
  console.log(response.data);
}).catch(function (error) {
  console.error(error);
});
Was this helpful?
/
#import <Foundation/Foundation.h>

NSDictionary *headers = @{ @"content-type": @"application/json" };
NSDictionary *parameters = @{ @"client_id": @"{yourClientId}",
                              @"client_secret": @"{yourClientSecret}",
                              @"connection": @"email",
                              @"email": @"{userEmail}",
                              @"send": @"code" };

NSData *postData = [NSJSONSerialization dataWithJSONObject:parameters options:0 error:nil];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"https://{yourDomain}/passwordless/start"]
                                                       cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                   timeoutInterval:10.0];
[request setHTTPMethod:@"POST"];
[request setAllHTTPHeaderFields:headers];
[request setHTTPBody:postData];

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];
Was this helpful?
/
$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://{yourDomain}/passwordless/start",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => "{\"client_id\": \"{yourClientId}\", \"client_secret\": \"{yourClientSecret}\", \"connection\": \"email\", \"email\": \"{userEmail}\",\"send\": \"code\"}",
  CURLOPT_HTTPHEADER => [
    "content-type: application/json"
  ],
]);

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

curl_close($curl);

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

conn = http.client.HTTPSConnection("")

payload = "{\"client_id\": \"{yourClientId}\", \"client_secret\": \"{yourClientSecret}\", \"connection\": \"email\", \"email\": \"{userEmail}\",\"send\": \"code\"}"

headers = { 'content-type': "application/json" }

conn.request("POST", "/{yourDomain}/passwordless/start", payload, headers)

res = conn.getresponse()
data = res.read()

print(data.decode("utf-8"))
Was this helpful?
/
require 'uri'
require 'net/http'
require 'openssl'

url = URI("https://{yourDomain}/passwordless/start")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
http.verify_mode = OpenSSL::SSL::VERIFY_NONE

request = Net::HTTP::Post.new(url)
request["content-type"] = 'application/json'
request.body = "{\"client_id\": \"{yourClientId}\", \"client_secret\": \"{yourClientSecret}\", \"connection\": \"email\", \"email\": \"{userEmail}\",\"send\": \"code\"}"

response = http.request(request)
puts response.read_body
Was this helpful?
/
import Foundation

let headers = ["content-type": "application/json"]
let parameters = [
  "client_id": "{yourClientId}",
  "client_secret": "{yourClientSecret}",
  "connection": "email",
  "email": "{userEmail}",
  "send": "code"
] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://{yourDomain}/passwordless/start")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
Was this helpful?
/



Send a magic link via email
You need to specify send: link.



  


  
  
curl --request POST \
  --url 'https://{yourDomain}/passwordless/start' \
  --header 'content-type: application/json' \
  --data '{"client_id": "{yourClientId}", "client_secret": "{yourClientSecret}", "connection": "email", "email": "{userEmail}","send": "link"}'
Was this helpful?
/
var client = new RestClient("https://{yourDomain}/passwordless/start");
var request = new RestRequest(Method.POST);
request.AddHeader("content-type", "application/json");
request.AddParameter("application/json", "{\"client_id\": \"{yourClientId}\", \"client_secret\": \"{yourClientSecret}\", \"connection\": \"email\", \"email\": \"{userEmail}\",\"send\": \"link\"}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
Was this helpful?
/
package main

import (
	"fmt"
	"strings"
	"net/http"
	"io/ioutil"
)

func main() {

	url := "https://{yourDomain}/passwordless/start"

	payload := strings.NewReader("{\"client_id\": \"{yourClientId}\", \"client_secret\": \"{yourClientSecret}\", \"connection\": \"email\", \"email\": \"{userEmail}\",\"send\": \"link\"}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("content-type", "application/json")

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

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

	fmt.Println(res)
	fmt.Println(string(body))

}
Was this helpful?
/
HttpResponse<String> response = Unirest.post("https://{yourDomain}/passwordless/start")
  .header("content-type", "application/json")
  .body("{\"client_id\": \"{yourClientId}\", \"client_secret\": \"{yourClientSecret}\", \"connection\": \"email\", \"email\": \"{userEmail}\",\"send\": \"link\"}")
  .asString();
Was this helpful?
/
var axios = require("axios").default;

var options = {
  method: 'POST',
  url: 'https://{yourDomain}/passwordless/start',
  headers: {'content-type': 'application/json'},
  data: {
    client_id: '{yourClientId}',
    client_secret: '{yourClientSecret}',
    connection: 'email',
    email: '{userEmail}',
    send: 'link'
  }
};

axios.request(options).then(function (response) {
  console.log(response.data);
}).catch(function (error) {
  console.error(error);
});
Was this helpful?
/
#import <Foundation/Foundation.h>

NSDictionary *headers = @{ @"content-type": @"application/json" };
NSDictionary *parameters = @{ @"client_id": @"{yourClientId}",
                              @"client_secret": @"{yourClientSecret}",
                              @"connection": @"email",
                              @"email": @"{userEmail}",
                              @"send": @"link" };

NSData *postData = [NSJSONSerialization dataWithJSONObject:parameters options:0 error:nil];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"https://{yourDomain}/passwordless/start"]
                                                       cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                   timeoutInterval:10.0];
[request setHTTPMethod:@"POST"];
[request setAllHTTPHeaderFields:headers];
[request setHTTPBody:postData];

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];
Was this helpful?
/
$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://{yourDomain}/passwordless/start",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => "{\"client_id\": \"{yourClientId}\", \"client_secret\": \"{yourClientSecret}\", \"connection\": \"email\", \"email\": \"{userEmail}\",\"send\": \"link\"}",
  CURLOPT_HTTPHEADER => [
    "content-type: application/json"
  ],
]);

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

curl_close($curl);

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

conn = http.client.HTTPSConnection("")

payload = "{\"client_id\": \"{yourClientId}\", \"client_secret\": \"{yourClientSecret}\", \"connection\": \"email\", \"email\": \"{userEmail}\",\"send\": \"link\"}"

headers = { 'content-type': "application/json" }

conn.request("POST", "/{yourDomain}/passwordless/start", payload, headers)

res = conn.getresponse()
data = res.read()

print(data.decode("utf-8"))
Was this helpful?
/
require 'uri'
require 'net/http'
require 'openssl'

url = URI("https://{yourDomain}/passwordless/start")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
http.verify_mode = OpenSSL::SSL::VERIFY_NONE

request = Net::HTTP::Post.new(url)
request["content-type"] = 'application/json'
request.body = "{\"client_id\": \"{yourClientId}\", \"client_secret\": \"{yourClientSecret}\", \"connection\": \"email\", \"email\": \"{userEmail}\",\"send\": \"link\"}"

response = http.request(request)
puts response.read_body
Was this helpful?
/
import Foundation

let headers = ["content-type": "application/json"]
let parameters = [
  "client_id": "{yourClientId}",
  "client_secret": "{yourClientSecret}",
  "connection": "email",
  "email": "{userEmail}",
  "send": "link"
] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://{yourDomain}/passwordless/start")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
Was this helpful?
/



Send a one-time-use password via SMS



  


  
  
curl --request POST \
  --url 'https://{yourDomain}/passwordless/start' \
  --header 'content-type: application/json' \
  --data '{"client_id": "{yourClientId}", "client_secret": "{yourClientSecret}", "connection": "sms", "phone_number": "{userPhoneNumber}","send": "code"}'
Was this helpful?
/
var client = new RestClient("https://{yourDomain}/passwordless/start");
var request = new RestRequest(Method.POST);
request.AddHeader("content-type", "application/json");
request.AddParameter("application/json", "{\"client_id\": \"{yourClientId}\", \"client_secret\": \"{yourClientSecret}\", \"connection\": \"sms\", \"phone_number\": \"{userPhoneNumber}\",\"send\": \"code\"}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
Was this helpful?
/
package main

import (
	"fmt"
	"strings"
	"net/http"
	"io/ioutil"
)

func main() {

	url := "https://{yourDomain}/passwordless/start"

	payload := strings.NewReader("{\"client_id\": \"{yourClientId}\", \"client_secret\": \"{yourClientSecret}\", \"connection\": \"sms\", \"phone_number\": \"{userPhoneNumber}\",\"send\": \"code\"}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("content-type", "application/json")

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

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

	fmt.Println(res)
	fmt.Println(string(body))

}
Was this helpful?
/
HttpResponse<String> response = Unirest.post("https://{yourDomain}/passwordless/start")
  .header("content-type", "application/json")
  .body("{\"client_id\": \"{yourClientId}\", \"client_secret\": \"{yourClientSecret}\", \"connection\": \"sms\", \"phone_number\": \"{userPhoneNumber}\",\"send\": \"code\"}")
  .asString();
Was this helpful?
/
var axios = require("axios").default;

var options = {
  method: 'POST',
  url: 'https://{yourDomain}/passwordless/start',
  headers: {'content-type': 'application/json'},
  data: {
    client_id: '{yourClientId}',
    client_secret: '{yourClientSecret}',
    connection: 'sms',
    phone_number: '{userPhoneNumber}',
    send: 'code'
  }
};

axios.request(options).then(function (response) {
  console.log(response.data);
}).catch(function (error) {
  console.error(error);
});
Was this helpful?
/
#import <Foundation/Foundation.h>

NSDictionary *headers = @{ @"content-type": @"application/json" };
NSDictionary *parameters = @{ @"client_id": @"{yourClientId}",
                              @"client_secret": @"{yourClientSecret}",
                              @"connection": @"sms",
                              @"phone_number": @"{userPhoneNumber}",
                              @"send": @"code" };

NSData *postData = [NSJSONSerialization dataWithJSONObject:parameters options:0 error:nil];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"https://{yourDomain}/passwordless/start"]
                                                       cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                   timeoutInterval:10.0];
[request setHTTPMethod:@"POST"];
[request setAllHTTPHeaderFields:headers];
[request setHTTPBody:postData];

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];
Was this helpful?
/
$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://{yourDomain}/passwordless/start",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => "{\"client_id\": \"{yourClientId}\", \"client_secret\": \"{yourClientSecret}\", \"connection\": \"sms\", \"phone_number\": \"{userPhoneNumber}\",\"send\": \"code\"}",
  CURLOPT_HTTPHEADER => [
    "content-type: application/json"
  ],
]);

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

curl_close($curl);

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

conn = http.client.HTTPSConnection("")

payload = "{\"client_id\": \"{yourClientId}\", \"client_secret\": \"{yourClientSecret}\", \"connection\": \"sms\", \"phone_number\": \"{userPhoneNumber}\",\"send\": \"code\"}"

headers = { 'content-type': "application/json" }

conn.request("POST", "/{yourDomain}/passwordless/start", payload, headers)

res = conn.getresponse()
data = res.read()

print(data.decode("utf-8"))
Was this helpful?
/
require 'uri'
require 'net/http'
require 'openssl'

url = URI("https://{yourDomain}/passwordless/start")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
http.verify_mode = OpenSSL::SSL::VERIFY_NONE

request = Net::HTTP::Post.new(url)
request["content-type"] = 'application/json'
request.body = "{\"client_id\": \"{yourClientId}\", \"client_secret\": \"{yourClientSecret}\", \"connection\": \"sms\", \"phone_number\": \"{userPhoneNumber}\",\"send\": \"code\"}"

response = http.request(request)
puts response.read_body
Was this helpful?
/
import Foundation

let headers = ["content-type": "application/json"]
let parameters = [
  "client_id": "{yourClientId}",
  "client_secret": "{yourClientSecret}",
  "connection": "sms",
  "phone_number": "{userPhoneNumber}",
  "send": "code"
] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://{yourDomain}/passwordless/start")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
Was this helpful?
/



Authenticate an SMS user



  


  
  
curl --request POST \
  --url 'https://{yourDomain}/oauth/token' \
  --header 'content-type: application/json' \
  --data '{"grant_type": "http://auth0.com/oauth/grant-type/passwordless/otp", "client_id": "{yourClientId}", "client_secret": "YOUR_CLIENT_SECRET", "username": "USER_PHONE_NUMBER", "otp": "code", "realm": "sms", "audience": "your-api-audience","scope": "openid profile email"}'
Was this helpful?
/
var client = new RestClient("https://{yourDomain}/oauth/token");
var request = new RestRequest(Method.POST);
request.AddHeader("content-type", "application/json");
request.AddParameter("application/json", "{\"grant_type\": \"http://auth0.com/oauth/grant-type/passwordless/otp\", \"client_id\": \"{yourClientId}\", \"client_secret\": \"YOUR_CLIENT_SECRET\", \"username\": \"USER_PHONE_NUMBER\", \"otp\": \"code\", \"realm\": \"sms\", \"audience\": \"your-api-audience\",\"scope\": \"openid profile email\"}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
Was this helpful?
/
package main

import (
	"fmt"
	"strings"
	"net/http"
	"io/ioutil"
)

func main() {

	url := "https://{yourDomain}/oauth/token"

	payload := strings.NewReader("{\"grant_type\": \"http://auth0.com/oauth/grant-type/passwordless/otp\", \"client_id\": \"{yourClientId}\", \"client_secret\": \"YOUR_CLIENT_SECRET\", \"username\": \"USER_PHONE_NUMBER\", \"otp\": \"code\", \"realm\": \"sms\", \"audience\": \"your-api-audience\",\"scope\": \"openid profile email\"}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("content-type", "application/json")

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

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

	fmt.Println(res)
	fmt.Println(string(body))

}
Was this helpful?
/
HttpResponse<String> response = Unirest.post("https://{yourDomain}/oauth/token")
  .header("content-type", "application/json")
  .body("{\"grant_type\": \"http://auth0.com/oauth/grant-type/passwordless/otp\", \"client_id\": \"{yourClientId}\", \"client_secret\": \"YOUR_CLIENT_SECRET\", \"username\": \"USER_PHONE_NUMBER\", \"otp\": \"code\", \"realm\": \"sms\", \"audience\": \"your-api-audience\",\"scope\": \"openid profile email\"}")
  .asString();
Was this helpful?
/
var axios = require("axios").default;

var options = {
  method: 'POST',
  url: 'https://{yourDomain}/oauth/token',
  headers: {'content-type': 'application/json'},
  data: {
    grant_type: 'http://auth0.com/oauth/grant-type/passwordless/otp',
    client_id: '{yourClientId}',
    client_secret: 'YOUR_CLIENT_SECRET',
    username: 'USER_PHONE_NUMBER',
    otp: 'code',
    realm: 'sms',
    audience: 'your-api-audience',
    scope: 'openid profile email'
  }
};

axios.request(options).then(function (response) {
  console.log(response.data);
}).catch(function (error) {
  console.error(error);
});
Was this helpful?
/
#import <Foundation/Foundation.h>

NSDictionary *headers = @{ @"content-type": @"application/json" };
NSDictionary *parameters = @{ @"grant_type": @"http://auth0.com/oauth/grant-type/passwordless/otp",
                              @"client_id": @"{yourClientId}",
                              @"client_secret": @"YOUR_CLIENT_SECRET",
                              @"username": @"USER_PHONE_NUMBER",
                              @"otp": @"code",
                              @"realm": @"sms",
                              @"audience": @"your-api-audience",
                              @"scope": @"openid profile email" };

NSData *postData = [NSJSONSerialization dataWithJSONObject:parameters options:0 error:nil];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"https://{yourDomain}/oauth/token"]
                                                       cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                   timeoutInterval:10.0];
[request setHTTPMethod:@"POST"];
[request setAllHTTPHeaderFields:headers];
[request setHTTPBody:postData];

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];
Was this helpful?
/
$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://{yourDomain}/oauth/token",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => "{\"grant_type\": \"http://auth0.com/oauth/grant-type/passwordless/otp\", \"client_id\": \"{yourClientId}\", \"client_secret\": \"YOUR_CLIENT_SECRET\", \"username\": \"USER_PHONE_NUMBER\", \"otp\": \"code\", \"realm\": \"sms\", \"audience\": \"your-api-audience\",\"scope\": \"openid profile email\"}",
  CURLOPT_HTTPHEADER => [
    "content-type: application/json"
  ],
]);

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

curl_close($curl);

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

conn = http.client.HTTPSConnection("")

payload = "{\"grant_type\": \"http://auth0.com/oauth/grant-type/passwordless/otp\", \"client_id\": \"{yourClientId}\", \"client_secret\": \"YOUR_CLIENT_SECRET\", \"username\": \"USER_PHONE_NUMBER\", \"otp\": \"code\", \"realm\": \"sms\", \"audience\": \"your-api-audience\",\"scope\": \"openid profile email\"}"

headers = { 'content-type': "application/json" }

conn.request("POST", "/{yourDomain}/oauth/token", payload, headers)

res = conn.getresponse()
data = res.read()

print(data.decode("utf-8"))
Was this helpful?
/
require 'uri'
require 'net/http'
require 'openssl'

url = URI("https://{yourDomain}/oauth/token")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
http.verify_mode = OpenSSL::SSL::VERIFY_NONE

request = Net::HTTP::Post.new(url)
request["content-type"] = 'application/json'
request.body = "{\"grant_type\": \"http://auth0.com/oauth/grant-type/passwordless/otp\", \"client_id\": \"{yourClientId}\", \"client_secret\": \"YOUR_CLIENT_SECRET\", \"username\": \"USER_PHONE_NUMBER\", \"otp\": \"code\", \"realm\": \"sms\", \"audience\": \"your-api-audience\",\"scope\": \"openid profile email\"}"

response = http.request(request)
puts response.read_body
Was this helpful?
/
import Foundation

let headers = ["content-type": "application/json"]
let parameters = [
  "grant_type": "http://auth0.com/oauth/grant-type/passwordless/otp",
  "client_id": "{yourClientId}",
  "client_secret": "YOUR_CLIENT_SECRET",
  "username": "USER_PHONE_NUMBER",
  "otp": "code",
  "realm": "sms",
  "audience": "your-api-audience",
  "scope": "openid profile email"
] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://{yourDomain}/oauth/token")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
Was this helpful?
/



Authenticate an Email user



  


  
  
curl --request POST \
  --url 'https://{yourDomain}/oauth/token' \
  --header 'content-type: application/json' \
  --data '{"grant_type": "http://auth0.com/oauth/grant-type/passwordless/otp", "client_id": "{yourClientId}", "client_secret": "{yourClientSecret}", "username": "{userPhoneNumber}", "otp": "code", "realm": "email", "audience": "your-api-audience", "scope": "openid profile email"}'
Was this helpful?
/
var client = new RestClient("https://{yourDomain}/oauth/token");
var request = new RestRequest(Method.POST);
request.AddHeader("content-type", "application/json");
request.AddParameter("application/json", "{\"grant_type\": \"http://auth0.com/oauth/grant-type/passwordless/otp\", \"client_id\": \"{yourClientId}\", \"client_secret\": \"{yourClientSecret}\", \"username\": \"{userPhoneNumber}\", \"otp\": \"code\", \"realm\": \"email\", \"audience\": \"your-api-audience\", \"scope\": \"openid profile email\"}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
Was this helpful?
/
package main

import (
	"fmt"
	"strings"
	"net/http"
	"io/ioutil"
)

func main() {

	url := "https://{yourDomain}/oauth/token"

	payload := strings.NewReader("{\"grant_type\": \"http://auth0.com/oauth/grant-type/passwordless/otp\", \"client_id\": \"{yourClientId}\", \"client_secret\": \"{yourClientSecret}\", \"username\": \"{userPhoneNumber}\", \"otp\": \"code\", \"realm\": \"email\", \"audience\": \"your-api-audience\", \"scope\": \"openid profile email\"}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("content-type", "application/json")

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

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

	fmt.Println(res)
	fmt.Println(string(body))

}
Was this helpful?
/
HttpResponse<String> response = Unirest.post("https://{yourDomain}/oauth/token")
  .header("content-type", "application/json")
  .body("{\"grant_type\": \"http://auth0.com/oauth/grant-type/passwordless/otp\", \"client_id\": \"{yourClientId}\", \"client_secret\": \"{yourClientSecret}\", \"username\": \"{userPhoneNumber}\", \"otp\": \"code\", \"realm\": \"email\", \"audience\": \"your-api-audience\", \"scope\": \"openid profile email\"}")
  .asString();
Was this helpful?
/
var axios = require("axios").default;

var options = {
  method: 'POST',
  url: 'https://{yourDomain}/oauth/token',
  headers: {'content-type': 'application/json'},
  data: {
    grant_type: 'http://auth0.com/oauth/grant-type/passwordless/otp',
    client_id: '{yourClientId}',
    client_secret: '{yourClientSecret}',
    username: '{userPhoneNumber}',
    otp: 'code',
    realm: 'email',
    audience: 'your-api-audience',
    scope: 'openid profile email'
  }
};

axios.request(options).then(function (response) {
  console.log(response.data);
}).catch(function (error) {
  console.error(error);
});
Was this helpful?
/
#import <Foundation/Foundation.h>

NSDictionary *headers = @{ @"content-type": @"application/json" };
NSDictionary *parameters = @{ @"grant_type": @"http://auth0.com/oauth/grant-type/passwordless/otp",
                              @"client_id": @"{yourClientId}",
                              @"client_secret": @"{yourClientSecret}",
                              @"username": @"{userPhoneNumber}",
                              @"otp": @"code",
                              @"realm": @"email",
                              @"audience": @"your-api-audience",
                              @"scope": @"openid profile email" };

NSData *postData = [NSJSONSerialization dataWithJSONObject:parameters options:0 error:nil];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"https://{yourDomain}/oauth/token"]
                                                       cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                   timeoutInterval:10.0];
[request setHTTPMethod:@"POST"];
[request setAllHTTPHeaderFields:headers];
[request setHTTPBody:postData];

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];
Was this helpful?
/
$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://{yourDomain}/oauth/token",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => "{\"grant_type\": \"http://auth0.com/oauth/grant-type/passwordless/otp\", \"client_id\": \"{yourClientId}\", \"client_secret\": \"{yourClientSecret}\", \"username\": \"{userPhoneNumber}\", \"otp\": \"code\", \"realm\": \"email\", \"audience\": \"your-api-audience\", \"scope\": \"openid profile email\"}",
  CURLOPT_HTTPHEADER => [
    "content-type: application/json"
  ],
]);

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

curl_close($curl);

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

conn = http.client.HTTPSConnection("")

payload = "{\"grant_type\": \"http://auth0.com/oauth/grant-type/passwordless/otp\", \"client_id\": \"{yourClientId}\", \"client_secret\": \"{yourClientSecret}\", \"username\": \"{userPhoneNumber}\", \"otp\": \"code\", \"realm\": \"email\", \"audience\": \"your-api-audience\", \"scope\": \"openid profile email\"}"

headers = { 'content-type': "application/json" }

conn.request("POST", "/{yourDomain}/oauth/token", payload, headers)

res = conn.getresponse()
data = res.read()

print(data.decode("utf-8"))
Was this helpful?
/
require 'uri'
require 'net/http'
require 'openssl'

url = URI("https://{yourDomain}/oauth/token")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
http.verify_mode = OpenSSL::SSL::VERIFY_NONE

request = Net::HTTP::Post.new(url)
request["content-type"] = 'application/json'
request.body = "{\"grant_type\": \"http://auth0.com/oauth/grant-type/passwordless/otp\", \"client_id\": \"{yourClientId}\", \"client_secret\": \"{yourClientSecret}\", \"username\": \"{userPhoneNumber}\", \"otp\": \"code\", \"realm\": \"email\", \"audience\": \"your-api-audience\", \"scope\": \"openid profile email\"}"

response = http.request(request)
puts response.read_body
Was this helpful?
/
import Foundation

let headers = ["content-type": "application/json"]
let parameters = [
  "grant_type": "http://auth0.com/oauth/grant-type/passwordless/otp",
  "client_id": "{yourClientId}",
  "client_secret": "{yourClientSecret}",
  "username": "{userPhoneNumber}",
  "otp": "code",
  "realm": "email",
  "audience": "your-api-audience",
  "scope": "openid profile email"
] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://{yourDomain}/oauth/token")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
Was this helpful?
/



Authenticate a user through a magic link
When you send a magic link, you don't need to call an API to authenticate the user. Users will click the link and be redirected to the callback URL.
Setting the auth0-forwarded-for header for rate-limit purposes
The /passwordless/start endpoint has a rate limit of 50 requests per hour per IP. If you call the API from the server-side, your backend's IP may easily hit these rate limits. To learn how to address this issue, read the Rate Limiting in Passwordless Endpoints section of Using Passwordless APIs.