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Inserting Users into Supabase when they sign up

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

Step 1: Overriding the Email-Password signup function#

// config/backendConfig.ts
import EmailPassword from "supertokens-node/recipe/emailpassword";import SessionNode from "supertokens-node/recipe/session";import { TypeInput, AppInfo } from "supertokens-node/types";import jwt from "jsonwebtoken";
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 getSupabaselet getSupabase: any;

let backendConfig = (): TypeInput => {    return {        framework: "express",        supertokens: {            connectionURI: "",        },        appInfo,        recipeList: [            EmailPassword.init({                override: {                    apis: (originalImplementation) => {                        return {                            ...originalImplementation,                            // the signUpPOST function handles sign up                            signUpPOST: async function (input) {                                if (originalImplementation.signUpPOST === undefined) {                                    throw Error("Should never come here");                                }
                                let response = await originalImplementation.signUpPOST(input);
                                if (response.status === "OK") {
                                    // 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                                        .from("users")                                        .insert({ email:, user_id: });
                                    if (error !== null) {
                                        throw error;                                    }                                }
                                return response;                            },                        };                    },                },            }),            SessionNode.init({/*...*/}),        ],        isInServerlessEnv: true,    };};

We will be changing the Email-Password signup flow by overriding the signUpPOST api. When a user signs up we will retrieve the supabase_token from the user's accessTokenPayload(this was added in the previous step where we changed the createNewSession function) and use it to query Supabase to insert the new user's information.

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