Which UI do you use?

Custom UI

Pre built UI

Post sign in callbacks

1) On the frontend

ReactJS

This method allows you to fire events immediately after a successful sign in. For example to send analytics events post sign in.

// this goes in the auth route config of your frontend app (once the pre built UI script has been loaded)
(window as any).supertokensUIInit("supertokensui", {
    appInfo: {
        apiDomain: "...",
        appName: "...",
        websiteDomain: "..."
    },
    recipeList: [
        (window as any).supertokensUIEmailPassword.init({
            onHandleEvent: async (context) => {
                if (context.action === "SUCCESS") {
                    if (context.isNewRecipeUser && context.user.loginMethods.length === 1) {
                        // TODO: Sign up
                    } else {
                        // TODO: Sign in
                    }
                }
            }
        }),
        (window as any).supertokensUISession.init()
    ]
});

info

Please refer to this page to learn more about the onHandleEvent hook.

Angular

This method allows you to fire events immediately after a successful sign in. For example to send analytics events post sign in.

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({
            onHandleEvent: async (context) => {
                if (context.action === "SUCCESS") {
                    if (context.isNewRecipeUser && context.user.loginMethods.length === 1) {
                        // TODO: Sign up
                    } else {
                        // TODO: Sign in
                    }
                }
            }
        }),
        Session.init()
    ]
});

info

Please refer to this page to learn more about the onHandleEvent hook.

Vue

This method allows you to fire events immediately after a successful sign in. For example to send analytics events post sign in.

// this goes in the auth route config of your frontend app (once the pre built UI script has been loaded)
(window as any).supertokensUIInit("supertokensui", {
    appInfo: {
        apiDomain: "...",
        appName: "...",
        websiteDomain: "..."
    },
    recipeList: [
        (window as any).supertokensUIEmailPassword.init({
            onHandleEvent: async (context) => {
                if (context.action === "SUCCESS") {
                    if (context.isNewRecipeUser && context.user.loginMethods.length === 1) {
                        // TODO: Sign up
                    } else {
                        // TODO: Sign in
                    }
                }
            }
        }),
        (window as any).supertokensUISession.init()
    ]
});

info

Please refer to this page to learn more about the onHandleEvent hook.

2) On the backend

For this, you'll have to override the signIn recipe function in the init function call.

NodeJS

Important

For other backend frameworks, you can follow our guide on how to spin up a separate server configured with the SuperTokens backend SDK to authenticate requests and issue session tokens.

GoLang

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: {
                functions: (originalImplementation) => {
                    return {
                        ...originalImplementation,
                        signIn: async function (input) {

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

                            // Post sign up response, we check if it was successful
                            if (response.status === "OK") {
                                /**
                                * 
                                * response.user contains the following info:
                                * - emails
                                * - id
                                * - timeJoined
                                * - tenantIds
                                * - phone numbers
                                * - third party login info
                                * - all the login methods associated with this user.
                                * - information about if the user's email is verified or not.
                                * 
                                */

                                // TODO: post sign in logic
                            }
                            return response;
                        }
                    }
                }
            }
        }),
        Session.init({ /* ... */ })
    ]
});

Python

import (
    "fmt"

    "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{
                    Functions: func(originalImplementation epmodels.RecipeInterface) epmodels.RecipeInterface {
                        // create a copy of the originalImplementation func
                        originalSignIn := *originalImplementation.SignIn

                        // override the sign in up function
                        (*originalImplementation.SignIn) = func(email, password, tenantId string, userContext supertokens.UserContext) (epmodels.SignInResponse, error) {

                            // First we call the original implementation of SignIn.
                            response, err := originalSignIn(email, password, tenantId, userContext)
                            if err != nil {
                                return epmodels.SignInResponse{}, err
                            }

                            if response.OK != nil {
                                // sign in was successful

                                // user object contains the ID and email
                                user := response.OK.User

                                // TODO: Post sign in logic.
                                fmt.Println(user)

                            }
                            return response, nil
                        }

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

Other Frameworks

from supertokens_python import init, InputAppInfo
from supertokens_python.recipe import session, emailpassword
from supertokens_python.recipe.emailpassword.interfaces import RecipeInterface, SignInOkResult
from typing import Dict, Any

def override_emailpassword_functions(original_implementation: RecipeInterface) -> RecipeInterface:
    original_sign_in = original_implementation.sign_in
    
    async def sign_in(
        email: str,
        password: str,
        tenant_id: str,
        user_context: Dict[str, Any]
    ):
        result = await original_sign_in(email, password, tenant_id, user_context)

        if isinstance(result, SignInOkResult):
            id = result.user.user_id
            email = result.user.email
            print(id)
            print(email)
            
            # TODO: post sign in logic
        
        return result
                
    original_implementation.sign_in = sign_in

    return original_implementation

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