How to send a custom response by overriding the API Interface

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

import Passwordless from "supertokens-node/recipe/passwordless";
Passwordless.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/passwordless/plessmodels"    "github.com/supertokens/supertokens-golang/recipe/passwordless"    "github.com/supertokens/supertokens-golang/supertokens")
func main() {    passwordless.Init(plessmodels.TypeInput{        Override: &plessmodels.OverrideStruct{            APIs: func(originalImplementation plessmodels.APIInterface) plessmodels.APIInterface {
                (*originalImplementation.EmailExistsGET) = func(email string, options plessmodels.APIOptions, userContext supertokens.UserContext) (plessmodels.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 plessmodels.EmailExistsGETResponse{                        OK: &struct{ Exists bool }{                            Exists: false,                        },                    }, nil                }
                return originalImplementation            },        },    })}

from supertokens_python.recipe import passwordlessfrom supertokens_python.recipe.passwordless.interfaces import APIOptions, EmailExistsGetOkResultfrom typing import Dict, Anyfrom supertokens_python.recipe.passwordless.interfaces import APIInterface

def override_passwordless_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)  # or any other status code        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
passwordless.init(    override=passwordless.InputOverrideConfig(        apis=override_passwordless_apis    ))