Which frontend SDK do you use?

supertokens-web-js / mobile

supertokens-auth-react

Adding Extra Fields

Step 1: Front End

Currently, your Sign-up form contains only email and password fields. But you might want to get more information from your customers on sign up. Let's see how you can extend the Sign-up form to fit your needs.

ReactJS

Note

You can use the supertokens-web-js SDK which exposes several helper functions that query the APIs exposed by the SuperTokens backend SDK.

You can refer to this example app as a reference for using the supertokens-web-js SDK.

Angular

Note

To use SuperTokens with React Native you need to use the supertokens-react-native SDK. The SDK provides session management features.

To add login functionality, you need to build your own UI and call the APIs exposed by the backend SDKs. You can find the API spec here

Vue

What type of UI are you using?

Prebuilt UICustom UI

Plain JavaScript

What type of UI are you using?

Prebuilt UICustom UI

React Native

import SuperTokens from "supertokens-auth-react";
import EmailPassword from "supertokens-auth-react/recipe/emailpassword";
import Session from "supertokens-auth-react/recipe/session";

SuperTokens.init({
    appInfo: {
        apiDomain: "...",
        appName: "...",
        websiteDomain: "..."
    },
    recipeList: [
        EmailPassword.init({
            signInAndUpFeature: {
                signUpForm: {
                    formFields: [{
                        id: "name",
                        label: "Full name",
                        placeholder: "First name and last name"
                    }, {
                        id: "age",
                        label: "Your age",
                        placeholder: "How old are you?",
                    }, {
                        id: "country",
                        label: "Your country",
                        placeholder: "Where do you live?",
                        optional: true
                    }]
                }
            }
        }),
        Session.init()
    ]
});

Step 2: Back End

Add fields to SuperTokens init

Now that you have added new fields to the front end you need to make sure that the backend will take them into account when your new users register.

Go back to where you have called the SuperTokens init function in your backend application:

NodeJS

import SuperTokens from "supertokens-node";
import EmailPassword from "supertokens-node/recipe/emailpassword";
import Session from "supertokens-node/recipe/session";

SuperTokens.init({
  appInfo: {
    apiDomain: "...",
    appName: "...",
    websiteDomain: "..."
  },
  supertokens: {
    connectionURI: "...",
  },
  recipeList: [
    EmailPassword.init({
      signUpFeature: {
        formFields: [{
          id: "name"
        }, {
          id: "age"
        }, {
          id: "country",
          optional: true
        }]
      }
    }),
    Session.init({ /* ... */ })
  ]
});

GoLang

import (
    "github.com/supertokens/supertokens-golang/recipe/emailpassword"
    "github.com/supertokens/supertokens-golang/recipe/emailpassword/epmodels"
    "github.com/supertokens/supertokens-golang/supertokens"
)

func main() {
    countryOptional := true
    supertokens.Init(supertokens.TypeInput{
        RecipeList: []supertokens.Recipe{
            emailpassword.Init(&epmodels.TypeInput{
                SignUpFeature: &epmodels.TypeInputSignUp{
                    FormFields: []epmodels.TypeInputFormField{
                        {
                            ID: "name",
                        },
                        {
                            ID: "age",
                        },
                        {
                            ID:       "country",
                            Optional: &countryOptional,
                        },
                    },
                },
            }),
        },
    })
}

Python

from supertokens_python import init, InputAppInfo
from supertokens_python.recipe import emailpassword, session
from supertokens_python.recipe.emailpassword import InputFormField

init(
    app_info=InputAppInfo(api_domain="...", app_name="...", website_domain="..."),
    
    framework='...', 
    recipe_list=[
        emailpassword.init(
            sign_up_feature=emailpassword.InputSignUpFeature(
                form_fields=[InputFormField(id='name'), InputFormField(id='age'), InputFormField(id='country', optional=True)]
            )
        ),
        session.init()
    ]
)

Step 3: Handle form fields on successful Sign-up

To handle form fields on the backend you'll have to override the signUpPOST API when initializing the recipe:

NodeJS

import SuperTokens from "supertokens-node";
import EmailPassword from "supertokens-node/recipe/emailpassword";
import Session from "supertokens-node/recipe/session";

SuperTokens.init({
    appInfo: {
        apiDomain: "...",
        appName: "...",
        websiteDomain: "..."
    },
    supertokens: {
        connectionURI: "...",
    },
    recipeList: [
        EmailPassword.init({
            override: {
                apis: (originalImplementation) => {
                    return {
                        ...originalImplementation,
                        signUpPOST: async function (input) {

                            if (originalImplementation.signUpPOST === undefined) {
                                throw Error("Should never come here");
                            }

                            // First we call the original implementation of signUpPOST.
                            let response = await originalImplementation.signUpPOST(input);

                            // Post sign up response, we check if it was successful
                            if (response.status === "OK") {

                                // These are the input form fields values that the user used while signing up
                                let formFields = input.formFields;

                            }
                            return response;
                        }
                    }
                }
            }
        }),
        Session.init({ /* ... */ })
    ]
});

GoLang

import (
    "github.com/supertokens/supertokens-golang/recipe/emailpassword"
    "github.com/supertokens/supertokens-golang/recipe/emailpassword/epmodels"
    "github.com/supertokens/supertokens-golang/supertokens"
)

func main() {
    supertokens.Init(supertokens.TypeInput{
        RecipeList: []supertokens.Recipe{
            emailpassword.Init(&epmodels.TypeInput{
                Override: &epmodels.OverrideStruct{
                    APIs: func(originalImplementation epmodels.APIInterface) epmodels.APIInterface {
                        // First we copy the original implementation func
                        originalSignUpPOST := *originalImplementation.SignUpPOST

                        (*originalImplementation.SignUpPOST) = func(formFields []epmodels.TypeFormField, options epmodels.APIOptions, userContext supertokens.UserContext) (epmodels.SignUpPOSTResponse, error) {
                            resp, err := originalSignUpPOST(formFields, options, userContext)
                            if err != nil {
                                return epmodels.SignUpPOSTResponse{}, err
                            }

                            if resp.OK != nil {
                                // sign up was successful

                                // TODO: You can now read the formFields from the input params

                            }

                            return resp, err
                        }

                        return originalImplementation
                    },
                },
            }),
        },
    })
}

Python

from supertokens_python import init, InputAppInfo
from supertokens_python.recipe import emailpassword, session
from supertokens_python.recipe.emailpassword.interfaces import APIInterface, APIOptions, SignUpPostOkResult
from supertokens_python.recipe.emailpassword.types import FormField
from typing import List, Dict, Any

def override_email_password_apis(original_implementation: APIInterface):
    original_sign_up_post = original_implementation.sign_up_post
    
    async def sign_up_post(form_fields: List[FormField],
                           api_options: APIOptions,
                           user_context: Dict[str, Any]):
        # First we call the original implementation of signInPOST.
        response = await original_sign_up_post(form_fields, api_options, user_context)

        # Post sign up response, we check if it was successful
        if isinstance(response, SignUpPostOkResult):
            _ = response.user.user_id
            __ = response.user.email
            # TODO: use the input form fields values for custom logic

        return response
    
    original_implementation.sign_up_post = sign_up_post
    return original_implementation

init(
    app_info=InputAppInfo(api_domain="...", app_name="...", website_domain="..."),
    framework='...', 
    recipe_list=[
        emailpassword.init(
            override=emailpassword.InputOverrideConfig(
                apis=override_email_password_apis
            )
        ),
        session.init()
    ]
)

caution

SuperTokens does not store custom form fields. You need to store them in your db post user sign up.