Custom error response using `GENERAL_ERROR` status

Sometimes, you may want to send a custom error message from your API override to display to the user on the frontend. This can be done by sending the following JSON response from the API:

{    "status": "GENERAL_ERROR",    "message": "Some custom error message"}

If you are using our pre-built ReactJS UI, the above response will render the mesage "Some custom error message" on the frontend UI. For custom UI, you can read this response and display the message in an error UI. This response can be returned from most of the APIs exposed by the backend SDK.

Let's take an example in which we want to prevent the user from signing up unless their email is preapproved by the app's admin. For this, we will override the sign up API to check if the input email is approved or not, and if not, we prevent the sign up, and send a custom error message.

NodeJS
GoLang
Python

import Passwordless from "supertokens-node/recipe/passwordless";
Passwordless.init({    contactMethod: "...",    override: {        apis: (oI) => {            return {                ...oI,                consumeCodePOST: async function (input) {                    let codesInfo = await Passwordless.listCodesByPreAuthSessionId({                        preAuthSessionId: input.preAuthSessionId                    })
                    let email = codesInfo?.email!
                    if (emailNotAllowed(email)) {                        return {                            status: "GENERAL_ERROR",                            message: "You are not allowed to sign up. Please contact the app's admin to get permission"                        }                    }                    return oI.consumeCodePOST!(input);                }            }        }    }})
function emailNotAllowed(email: string) {    // TODO: your impl to check if email is allowed or not    return true;}

import (    "github.com/supertokens/supertokens-golang/recipe/passwordless"    "github.com/supertokens/supertokens-golang/recipe/passwordless/plessmodels"    "github.com/supertokens/supertokens-golang/supertokens")
func main() {    passwordless.Init(plessmodels.TypeInput{        Override: &plessmodels.OverrideStruct{            APIs: func(originalImplementation plessmodels.APIInterface) plessmodels.APIInterface {                ogConsumeCodePOST := *originalImplementation.ConsumeCodePOST
                (*originalImplementation.ConsumeCodePOST) = func(userInput *plessmodels.UserInputCodeWithDeviceID, linkCode *string, preAuthSessionID string, options plessmodels.APIOptions, userContext supertokens.UserContext) (plessmodels.ConsumeCodePOSTResponse, error) {                    codeInfo, err := passwordless.ListCodesByPreAuthSessionID(preAuthSessionID)                    if err != nil {                        return plessmodels.ConsumeCodePOSTResponse{}, err                    }                    email := *codeInfo.Email                    if emailNotAllowed(email) {                        return plessmodels.ConsumeCodePOSTResponse{                            GeneralError: &supertokens.GeneralErrorResponse{                                Message: "You are not allowed to sign up. Please contact the app's admin to get permission",                            },                        }, nil                    }
                    return ogConsumeCodePOST(userInput, linkCode, preAuthSessionID, options, userContext)                }
                return originalImplementation            },        },    })}
func emailNotAllowed(email string) bool {    // TODO: your impl to check email    return true}

from supertokens_python.recipe import passwordlessfrom supertokens_python.recipe.passwordless.interfaces import APIOptions, ConsumeCodePostOkResult, ConsumeCodePostRestartFlowError, ConsumeCodePostIncorrectUserInputCodeError, ConsumeCodePostExpiredUserInputCodeErrorfrom typing import Dict, Any, Unionfrom supertokens_python.recipe.passwordless.interfaces import APIInterfacefrom supertokens_python.recipe.passwordless.asyncio import list_codes_by_pre_auth_session_idfrom supertokens_python.types import GeneralErrorResponse


def override_passwordless_apis(original_implementation: APIInterface):
    original_consume_code_post = original_implementation.consume_code_post
    async def consume_code_post(pre_auth_session_id: str, user_input_code: Union[str, None], device_id: Union[str, None], link_code: Union[str, None], api_options: APIOptions,                                user_context: Dict[str, Any]) -> Union[ConsumeCodePostOkResult, ConsumeCodePostRestartFlowError, GeneralErrorResponse, ConsumeCodePostIncorrectUserInputCodeError, ConsumeCodePostExpiredUserInputCodeError]:        code_info = await list_codes_by_pre_auth_session_id(pre_auth_session_id)        if code_info is None:            raise Exception("Should never come here")        email = code_info.email        if email is None:            # this example is focused on login via email            raise Exception("Should never come here")        if (is_not_allowed(email)):            return GeneralErrorResponse("You are not allowed to sign up. Please contact the app's admin to get permission")        return await original_consume_code_post(pre_auth_session_id, user_input_code, device_id, link_code, api_options, user_context)
    original_implementation.consume_code_post = consume_code_post    return original_implementation

def is_not_allowed(email: str):    # TODO: your impl to check if the email is allowed    return True

passwordless.init(    override=passwordless.InputOverrideConfig(        apis=override_passwordless_apis    ))