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Inserting Users into Supabase when they sign up

In our example app a user can sign up via Social Login based authentication. We will need to override this API such that when a user signs up, their email mapped to their userId is stored in Supabase.

Step 2: Overriding the Social Provider login function:#

// config/backendConfig.ts

import ThirdParty from "supertokens-node/recipe/thirdparty";
import SessionNode from "supertokens-node/recipe/session";
import { TypeInput, AppInfo } from "supertokens-node/types";

let appInfo: AppInfo = {
appName: "TODO: add your app name",
apiDomain: "TODO: add your website domain",
websiteDomain: "TODO: add your website domain"

// take a look at the Creating Supabase Client section to see how to define getSupabase
let getSupabase: any;

let backendConfig = (): TypeInput => {
return {
framework: "express",
supertokens: {
connectionURI: "",
recipeList: [
providers: [/*...*/]
override: {
apis: (originalImplementation) => {
return {

// the signInUpPOST function handles sign up/in via Social login
signInUpPOST: async function (input) {
if (originalImplementation.signInUpPOST === undefined) {
throw Error("Should never come here");

// call the sign up/in api for social login
let response = await originalImplementation.signInUpPOST(input);

// check that there is no issue with sign up and that a new user is created
if (response.status === "OK" && response.createdNewUser) {

// retrieve the accessTokenPayload from the user's session
const accessTokenPayload = response.session.getAccessTokenPayload();

// create a supabase client with the supabase_token from the accessTokenPayload
const supabase = getSupabase(accessTokenPayload.supabase_token);

// store the user's email mapped to their userId in Supabase
const { error } = await supabase
.insert({ email:, user_id: });

if (error !== null) {

throw error;

return response;
isInServerlessEnv: true,

We will be changing the Social Login flow by overriding the signInUpPOST api. We will first check that the user logging in is a new user. If they are a new user we will retrieve the supabase_token from their accessTokenPayload and use it to map their email to userId in Supabase.

Which frontend SDK do you use?
supertokens-web-js / mobile