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5a. Session verification in an API call


This is applicable for when the frontend calls an API in the /pages/api folder.

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

1) Create a new file /pages/api/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.

import supertokens from 'supertokens-node'import { backendConfig } from '../../../config/backendConfig'

3) Call the verifySession session function#

import { superTokensNextWrapper } from 'supertokens-node/nextjs'import { verifySession } from 'supertokens-node/recipe/session/framework/express'import supertokens from 'supertokens-node'import { backendConfig } from '../../../config/backendConfig'import NextCors from "nextjs-cors";
export default async function user(req: any, res: any) {
    // NOTE: We need CORS only if we are querying the APIs from a different origin    await NextCors(req, res, {        methods: ["GET", "HEAD", "PUT", "PATCH", "POST", "DELETE"],        origin: "<YOUR_WEBSITE_DOMAIN>",        credentials: true,        allowedHeaders: ["content-type", ...supertokens.getAllCORSHeaders()],    });
    // we first verify the session    await superTokensNextWrapper(        async (next) => {            return await verifySession()(req, res, next)        },        req, res    )    // if it comes here, it means that the session verification was successful

    return res.json({        note:            'Fetch any data from your application for authenticated user after using verifySession middleware',        userId: req.session.getUserId(),        sessionHandle: req.session.getHandle(),        userDataInAccessToken: req.session.getAccessTokenPayload(),    })}
  • If no session exists, the API will return a 401 error to the client. In this case, the code return res.json will not be executed at all.
  • In case the session does exist, req.session can be used to get session information. Learn more about this object here.