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NextAuth.js with Slack Provider Set Up

December 18, 2021

Just a quick note on configuration changes needed for the Slack provider to save the authenticated user correctly using the Prisma adapter.

The below changes assume that the app is set up following the NextAuth.js documentation.

schema.prisma #

The schema needs to be adjusted to include both state and ok.

generator client {
  provider = "prisma-client-js"

datasource db {
  provider = "postgresql"
  url      = env("DATABASE_URL")

model Account {
  id                 String   @id @default(cuid())
  userId             String
  type               String
  provider           String
  providerAccountId  String
  refresh_token      String?
  access_token       String?
  expires_at         Int?
  token_type         String?
  scope              String?
  id_token           String?
  session_state      String?
+ ok                 Boolean?
+ state              String?
  oauth_token_secret String?
  oauth_token        String?

  user User @relation(fields: [userId], references: [id], onDelete: Cascade)

  @@unique([provider, providerAccountId])

model Session {
  id           String   @id @default(cuid())
  sessionToken String   @unique
  userId       String
  expires      DateTime
  user         User     @relation(fields: [userId], references: [id], onDelete: Cascade)

model User {
  id            String    @id @default(cuid())
  name          String?
  email         String?   @unique
  emailVerified DateTime?
  image         String?
  accounts      Account[]
  sessions      Session[]

model VerificationToken {
  identifier String
  token      String   @unique
  expires    DateTime

  @@unique([identifier, token])

api/auth/[...nextauth].js #

import NextAuth from "next-auth";
import SlackProvider from "next-auth/providers/slack";
import { PrismaAdapter } from "@next-auth/prisma-adapter";
import prisma from "../../../lib/prisma";

export default NextAuth({
  adapter: PrismaAdapter(prisma),
  providers: [
      clientId: process.env.SLACK_CLIENT_ID,
      clientSecret: process.env.SLACK_CLIENT_SECRET,
      idToken: true,
  callbacks: {
    async session({ session, token, user }) {
      // ...
      return session;
  secret: process.env.SECRET,
  theme: {
    colorScheme: "light",
  theme: {
    colorScheme: "auto",
    logo: "https://next-auth.js.org/img/logo/logo-sm.png",
    brandColor: "#1786fb",

If you have any questions or feedback, feel free to reach out on X @siegerts.