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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.ts#

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"],
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({
'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.
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