How to send a custom response

important

This feature is only applicable for users who build their own frontend since our frontend requires on a specific output from the APIs as defined here.

Let's take an example of sending a custom response for the /auth/signup/email/exists GET API (does email exist).

We need to first override the function for that API (emailExistsGET) and then use the response object in the input param to send a custom response.

The function signature expects an return type that has a certain shape, therefore, we must still return a valid response object from the function, but that will be ignored since you have already sent a response to the client.

NodeJS
GoLang
Python
Other Frameworks


import EmailPassword from "supertokens-node/recipe/emailpassword";

EmailPassword.init({
    override: {
        apis: (originalImplementation) => {
            return {
                ...originalImplementation,
                emailExistsGET: async function (input) {

                    // we can send a custom response like this:
                    input.options.res.setStatusCode(200); // or any other status code
                    input.options.res.sendJSONResponse({
                        message: "my custom response",
                        //...
                    })

                    // this return doesn't matter. But we must do it
                    // cause the function signature expects a response.
                    return {
                        status: "OK",
                        exists: false
                    };
                }
            }
        }
    }
})

import (
    "encoding/json"

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

func main() {
    emailpassword.Init(&epmodels.TypeInput{
        Override: &epmodels.OverrideStruct{
            APIs: func(originalImplementation epmodels.APIInterface) epmodels.APIInterface {

                (*originalImplementation.EmailExistsGET) = func(email string, options epmodels.APIOptions, userContext supertokens.UserContext) (epmodels.EmailExistsGETResponse, error) {

                    // we create our custom response.
                    options.Res.Header().Set("Content-Type", "application/json; charset=utf-8")
                    options.Res.WriteHeader(200)
                    responseJson := map[string]interface{}{
                        "message": "My custom response",
                        // ...
                    }

                    bytes, _ := json.Marshal(responseJson)
                    options.Res.Write(bytes)

                    // this return doesn't matter. But we must do it
                    // cause the function signature expects a response.
                    return epmodels.EmailExistsGETResponse{
                        OK: &struct{ Exists bool }{
                            Exists: false,
                        },
                    }, nil
                }

                return originalImplementation
            },
        },
    })
}

from supertokens_python.recipe.emailpassword.interfaces import APIOptions, EmailExistsGetOkResult, APIInterface
from supertokens_python.recipe import emailpassword
from typing import Dict, Any

def override_emailpassword_apis(original_implementation: APIInterface):

    async def email_exists_get(email: str, api_options: APIOptions, user_context: Dict[str, Any]):

        # send custom response like this
        api_options.response.set_status_code(200)  
        json_dict = {'message': 'Custom response'}
        api_options.response.set_json_content(json_dict) 

        # this return doesn't matter. But we must do it
        # cause the function signature expects a response.
        return EmailExistsGetOkResult(False)

    original_implementation.email_exists_get = email_exists_get
    return original_implementation


emailpassword.init(override=emailpassword.InputOverrideConfig(apis=override_emailpassword_apis))

Auth Methods

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How to send a custom response

important

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