js
import { useEffect } from 'react';
import Link from 'next/link'
import { EmailPasswordAuth } from 'supertokens-auth-react/recipe/emailpassword';
import Session from 'supertokens-auth-react/recipe/session';
import EmailPassword from "supertokens-node/recipe/emailpassword";
import supertokens from 'supertokens-node'
import { backendConfig } from '../config/backendConfig'

supertokens.init(backendConfig())
export default function Navbar() {
    useEffect( () => {
       Session.getUserId().then(userID => 
           EmailPassword.getUserById(userID).then( user =>
           console.log(user.email)
           )
       )
    }, [])

EmailPassword.getUserById

js
import EmailPassword from "supertokens-node/recipe/emailpassword";
import { superTokensNextWrapper } from 'supertokens-node/nextjs'
import { verifySession } from "supertokens-node/recipe/session/framework/express";
import { SessionRequest } from "supertokens-node/framework/express";

export default async function likeComment(req: SessionRequest, res: any) {
    await superTokensNextWrapper(
        async (next) => {
            await verifySession()(req, res, next);
        },
        req,
        res
    )

    let userId = req.session!.getUserId();
    // You can learn more about the `User` object over here https://github.com/supertokens/core-driver-interface/wiki
    let userInfo = await EmailPassword.getUserById(userId);
    //....
}

import supertokens from 'supertokens-node'

js
import EmailPassword from "supertokens-node/recipe/emailpassword";
import { superTokensNextWrapper } from 'supertokens-node/nextjs'
import { verifySession } from "supertokens-node/recipe/session/framework/express";
import { SessionRequest } from "supertokens-node/framework/express";

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

supertokens.init(backendConfig())

export default async function getEmail(req, res) {
    await superTokensNextWrapper(
        async (next) => {
            await verifySession()(req, res, next);
        },
        req,
        res
    )

    let userId = req.session.getUserId();
    // You can learn more about the `User` object over here https://github.com/supertokens/core-driver-interface/wiki
    let userInfo = await EmailPassword.getUserById(userId);
    return userInfo
  
}

backendConfig()

js
import EmailPasswordNode from 'supertokens-node/recipe/emailpassword'
import SessionNode from 'supertokens-node/recipe/session'
import { appInfo } from './appInfo'
import { TypeInput } from "supertokens-node/types";

export const backendConfig = () => {
  return {
    framework: "express",
    supertokens: {
      // https://try.supertokens.com is for demo purposes. Replace this with the address of your core instance (sign up on supertokens.com), or self host a core.
      connectionURI: "http://localhost:3567",
      // apiKey: "IF YOU HAVE AN API KEY FOR THE CORE, ADD IT HERE",
    },
    appInfo,
    recipeList: [
      EmailPasswordNode.init(),
      SessionNode.init(),
    ],
    isInServerlessEnv: true,
  }
}

js
export const appInfo = {
  appName: "Supertokens demo",
  apiDomain: "http://localhost:3000",
  websiteDomain: "http://localhost:3000",
  apiBasePath: "/api/auth",
  websiteBasePath: "/auth",
}

Unhandled Runtime Error
Error: Please provide a valid URL path

Source
normaliseURLPathOrThrowError
node_modules/supertokens-node/lib/build/normalisedURLPath.js (72:0)
new NormalisedURLPath
node_modules/supertokens-node/lib/build/normalisedURLPath.js (35:0)
Object.normaliseInputAppInfoOrThrowError
node_modules/supertokens-node/lib/build/utils.js (54:0)
new SuperTokens
node_modules/supertokens-node/lib/build/supertokens.js (341:0)
SuperTokensWrapper.init
node_modules/supertokens-node/lib/build/supertokens.js (384:0)

nvm