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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/lib/build/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 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.