Which frontend SDK do you use?

supertokens-web-js / mobile

supertokens-auth-react

4. Session verification / Building your APIs

For this guide, we will assume that we want an API /.netlify/functions/user GET which returns the current session information.

1) Create a new file netlify/functions/user.js

An example of this is here.

2) Call the supertokens.init function

Remember that whenever we want to use any functions from the supertokens-node lib, we have to call the supertokens.init function at the top of that serverless function file.

netlify/functions/user.ts

import supertokens from "supertokens-node";
import { getBackendConfig } from "../../config/supertokensConfig";

supertokens.init(getBackendConfig())

3) Use session verification with your API handler

We use the verifySession() middleware to verify a session.

netlify/functions/user.ts

import supertokens from "supertokens-node";
import { verifySession } from "supertokens-node/recipe/session/framework/awsLambda";
import { SessionEvent } from "supertokens-node/framework/awsLambda"
import middy from "@middy/core";
import cors from "@middy/http-cors";
import { getBackendConfig } from "../../config/supertokensConfig";

supertokens.init(getBackendConfig());

const handler = async (event: SessionEvent) => {
    return {
        body: JSON.stringify({
            sessionHandle: event.session!.getHandle(),
            userId: event.session!.getUserId(),
            accessTokenPayload: event.session!.getAccessTokenPayload(),
        }),
    };
};

module.exports.handler = middy(verifySession(handler)).use(
    cors({
        origin: getBackendConfig().appInfo.websiteDomain,
        credentials: true,
        headers: ["Content-Type", ...supertokens.getAllCORSHeaders()].join(", "),
        methods: "OPTIONS,POST,GET,PUT,DELETE",
    })
).onError(request => {
    throw request.error;
});