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3. Exposing Auth APIs

We will add all the backend APIs for auth on /.netlify/functions/auth/*. This can be changed by setting the apiBasePath property in the appInfo object on the backend and frontend. For the rest of this page, we will assume you are using /.netlify/functions/auth/*.

1) Create the netlify/functions/auth.js page#

  • Be sure to create the netlify/functions/ folder.
  • An example of this can be found here.
netlify/functions/auth.js
let supertokens = require("supertokens-node");let { middleware } = require("supertokens-node/framework/awsLambda");let middy = require("@middy/core");let cors = require("@middy/http-cors");let { getBackendConfig } = require("../../config/supertokensConfig");
supertokens.init(getBackendConfig());
module.exports.handler = middy(middleware()).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;});
important
  • Notice that we called supertokens.init above. We will need to call this in all API endpoints that use any functions related to supertokens.
  • CORS is only needed if you are hosting your frontend using a separate domain (if your website domain is different that your API's domain).

3) Use the login widget#

If you are now able to sign in or sign up, this means the backend setup is done correctly! If not, please feel free to ask questions on Discord