## Building a Complete Authentication System with NextAuth.js v4 and ... https://medium.com/%40muhebollah.diu/building-a-complete-authentication-system-with-nextauth-js-v4-and-external-api-in-next-js-15-3544c3dc561c Complete Authentication System with NextAuth.js v4 and External API in Next.js 15 Muhibullah ... Learn how to implement secure authentication with automatic token refresh, session management, and route protection in your Next.js 15 application using the App Router ... Authentication is one of the most critical aspects of modern web applications, but it’s also one of the most complex to implement correctly. Between managing tokens, handling expiry, securing routes, and providing a smooth user experience, ... If you’re building a Next.js application that needs to authenticate against an external API (maybe your backend is built with Node.js, Django, or.NET), this guide will show you exactly how to implement a robust authentication system using NextAuth.js v4. What you’ll learn: ... - TypeScript support — Full type safety out of the box - Session management — Both JWT and database sessions - Flexible authentication — Works with any authentication provider or custom API - Security by default — CSRF protection, secure cookies, JWT handling ... - Node.js 18.18 or later (required for Next.js 15) - Basic understanding of React Server Components and Next.js App Router - An external API with login and refresh token endpoints - A Next.js 15 application set up with App Router ... NextAuth stores tokens in encrypted JWT cookie5. User accesses protected pages6. When token expires, NextAuth ... ``` NEXTAUTH_SECRET=your-super-secret-key-hereNEXTAUTH_URL=http://localhost:3000NEXT_PUBLIC_API_BASE_URL=https://your-api.c ... Create`/app/api/auth/[...nextauth]/route.js`(note the new App Router structure): ... import NextAuth from "next-auth"import CredentialsProvider from "next-auth/providers/credentials"const API_BASE_URL = ... // } return data } catch (error) { console.error("Authentication error:", error) return null }}export const authOptions = { providers: [ CredentialsProvider({ name: "credentials", credentials: { email: { ... authorize(credentials) { if (!credentials?.email ||!credentials?.password) { return null } ... './globals.css'const inter = Inter({ subsets: ['latin'] })export const metadata = { title: 'My App with Auth', description: 'Complete authentication system with NextAuth.js v4',}export default function RootLayout({ children }) { ... NEXTAUTH_SECRET=use-a-long-random-string-in-productionNEXTAUTH_URL=https://yourdomain.comNEXT_PUBLIC_API_BASE_URL=https ... ``` export const authOptions = { /* your config */ }export default NextAuth(authOptions) ``` ... Next.js 15 defaults to App Router, which brings several important changes: 1. Server Components: Can directly access sessions and make API calls ... 4. Export Pattern: Must export`GET` and`POST` handlers explicitly 5. API Routes Structure:`/app/api/auth/[...nextauth]/route.js` instead of`/pages/api/auth/[...nextauth].js` ... ## Conclusion You now have a complete, production-ready authentication system that: ... This setup scales well and works with any backend API. The automatic token refresh ensures users never experience ... - [JWT Best Pract ## How to Build a Complete Authentication System in Next.js with NextAuth.js and MongoDB | by Shree Jaybhay | Jan, 2026 | Medium https://medium.com/%40shreejaybhay/build-a-complete-authentication-system-in-next-js-with-nextauth-js-mongodb-6a8a636766fb Authentication System in Next.js with NextAuth.js and MongoDB Shree Jaybhay ... A step-by-step guide to OAuth login, email/password authentication, email verification, and password reset ... Authentication is one of those features every app needs, but building it from scratch can feel overwhelming — especially when you want OAuth, email verification, and password reset all working together. While building Jammify (a music app), I implemented a complete auth system with NextAuth.js and MongoDB, which handles ... - ✅ JWT-based session management - ✅ Protected routes using middleware ... User Registration → Verification Email → Email Verified → Account ActiveUser Login → Credential/OAuth Validation → JWT ... - Basic knowledge of Next.js and React - GitHub OAuth App ... ## Step 1: Install Dependencies First, let’s install all the packages we’ll need for our authentication system: ``` npm install next-auth mongoose bcryptjs jsonwebtoken nodemailer ``` Here’s what each package is for: - `nodemailer`– Sends verification and password reset emails. - `jsonwebtoken`– Creates and verifies JWT tokens for session handling. - `bcryptjs`– Securely hashes passwords before saving them to the database. - `mongoose`– Connects to MongoDB and defines your data models. - `next-auth`– Handles authentication and session management. ... NextAuth configurationNEXTAUTH_URL=http://localhost:3000NEXT_PUBLIC_APP_URL=http://localhost:3000NEXTAUTH_SECRET=demo_nextauth_s ecret_key_123456789# ... ## Step 5: Create the Auth.js Next, we’ll configure NextAuth.js to handle authentication with both OAuth providers (Google/GitHub) and credentials (email/password). This configuration also integrates with our MongoDB User model and handles JWT sessions. Create a file:`src/lib/auth.js` ``` import NextAuth from 'next-auth';import CredentialsProvider from 'next-auth/providers/credentials';import GoogleProvider from 'next-auth/providers/google';import GitHubProvider from 'next-auth/providers/github';import connectDB from './mongodb';import User from '../models/User';export const authOptions = { providers: [ CredentialsProvider({ name: 'credentials', credentials: { email: { label: 'Email', type: 'email' }, password: { label: 'Password', type: 'password' } }, async authorize(credentials) { if ... token.email; session.user.image = token.image; } return session; }, }, pages: { signIn: ... Create a file:`src/app/api/auth/[...nextauth]/route.js`: ... import NextAuth from 'next-auth';import { authOptions } from '../../../../lib/auth';const handler = NextAuth(auth ## GitHub - pras75299/nextjsAuthentication: Fullstack Next Js Authentication with MongoDB, JWT, Bcrypt and NextJS Router https://github.com/pras75299/nextjsauthentication in with another tab or window. Reload to refresh your session.You signed out in another tab or ... * Star2 Fullstack Next Js Authentication with MongoDB, JWT, Bcrypt and NextJS Router nextjs-authentication-bay.vercel.app/ ... Notifications You must be signed in to change notification settings # pras75299/nextjsAuthentication main ... src | | | .eslintrc.json | .eslintrc.json | | | .gitignore | ... components.json | | | next.config.mjs | next.config.mjs | | | ... | | | postcss.config.js | postcss.config.js | | | tailwind.config.ts | tailwind.config.ts | | | tsconfig.json | tsconfig.json | | | View all files | ## Repository files navigation # Next.js, MongoDB, bcrypt, JWT, and Mailtrap Project This project is built using Next.js and integrates MongoDB for database operations, bcrypt for password hashing, JWT for authentication, and Mailtrap to simulate email sending in a development environment. ## Getting Started First, install the dependencies: ``` npm install ``` Then, run the development server: ``` npm run dev#oryarn dev#orpnpm dev#orbun dev ``` Open http://localhost:3000 to see the application in action. ## Features * User Authentication: Sign up, sign in, and sign out functionality using JWT. * Password Hashing: Secure password hashing using bcrypt. ... * Database Integration: MongoDB integration for storing and managing user data. ## Configuration Ensure you have the following environment variables configured in your`.env`file: * `MONGODB\_URI`: Your MongoDB connection string. ... * `JWT\_SECRET`: A secret key for JWT signing and verification. * `MAILTRAP\_USER`: Your Mailtrap username. ... For deployment instructions and best practices, refer to the Next.js deployment documentation . ## License This project is open-sourced under the MIT license. ## About Fullstack Next Js Authentication with MongoDB, JWT, Bcrypt and NextJS Router nextjs-authentication-bay.vercel.app/ ### Topics jwt mongodb authentication mailtrap bcryptjs [nextjs-template] moongose nextjs-starter nextjs14 ### Resources Readme ## GitHub - ipraveenkmr/Next-JS-14-Authentication-Using-NextAuth.js-Credentials-MongoDB: Next JS 14 Authentication Using NextAuth.js Credentials MongoDB https://github.com/ipraveenkmr/next-js-14-authentication-using-nextauth.js-credentials-mongodb ipraveenkmr / ** Next-JS-14-Authentication-Using-NextAuth.js-Credentials-MongoDB ** Public - Notifications You must be signed in to change notification settings - Fork\ 3 - Star\ 3 Next JS 14 Authentication Using NextAuth.js Credentials MongoDB 3\ stars 3\ forks Branches Tags Activity Star ... # ipraveenkmr/Next-JS-14-Authentication-Using-NextAuth.js-Credentials-MongoDB main Branches Tags Go to file Code ## Folders and files ... Download project source code from my website: CodingMstr Website ( https://codingmstr.com ) This is a Next.js project bootstrapped with `create-next-app` . ## Getting Started First, run the development server: ``` npm run dev # or yarn dev # or pnpm dev # or bun dev ``` Open http://localhost:3000 with your browser to see the result. You can start editing the page by modifying `app/page.tsx`. The page auto-updates as you edit the file. This project uses `next/font` to automatically optimize and load Inter, a custom Google Font. ## Learn More To learn more about Next.js, take a look at the following resources: - Next.js Documentation \- learn about Next.js features and API. ... The easiest way to deploy your Next.js app is to use the Vercel Platform from the creators of Next.js. Check out our Next.js deployment documentation for more details. ## About Next JS 14 Authentication Using NextAuth.js Credentials MongoDB ### Resources Readme Activity ### Stars **3**\ stars ### Watchers **1**\ watching ### Forks **3**\ forks Report repository ## Releases No releases published ## Packages\ 0 No packages published ## Languages ## Building authentication in Next.js App Router: The complete guide for 2026 — WorkOS https://workos.com/blog/nextjs-app-router-authentication-guide-2026 Building authentication in Next.js App Router: The complete guide for 2026 — WorkOS In this article Authentication in Next.js App Router represents a fundamental shift from traditional approaches. The introduction of React Server Components, edge runtime capabilities, and new security models requires developers to master patterns that weren't necessary in the Pages Router era. With the critical CVE-2025-29927 vulnerability affecting millions of ... This guide walks you through everything you need to know about authentication in Next.js App Router: from core concepts and security patterns to implementation strategies and production best practices. Whether you're building ... // ✅ SECURE: Only public data passes to client interface UserProfileDTO { id: string name: string ... import { z } from 'zod' import { verifySession } from '@/lib/auth' const updateSchema = z.object({ name: z.string().min(1).max(100), email: z.string().email(), }) ... for authentication. CVE-2025-29927 allows attackers to completely bypass middleware checks by manipulating ... Affected versions: - Self-hosted applications using`next start` - Next.js 11.1.4 through 15.2.2 (fixed in 15.2.3+) ... 3. Upgrade immediately to Next.js 15.2.3+, 14.2.25+, 13.5.9+, or 12.3.5+. ... ### Defense-in-depth authentication The modern approach to App Router authentication uses multiple verification layers: ``` // lib/dal.ts - Data Access Layer import'server-only' import { cache } from'react' import { cookies } from 'next/headers' export const verifySession = cache(async () = { const sessionCookie = cookies().get('session')?.value ... // Verify the session token const session = await verifyJWT(sessionCookie) if (!session?.userId) { ... // Usage in Server Component export default async function ProtectedPage() { const auth = await verifySession() ... with the most restrictive settings and only relax them if you have a specific, justified reason. ## Authentication implementation patterns in Next.js App Router Now that we understand the security model, let's look at how to actually implement authentication in App Router. The patterns below represent battle-tested approaches that balance security, performance, and developer experience. ### Pattern 1: Middleware + Data Access Layer This is the gold standard for App Router authentication, combining edge middleware for fast initial checks with ... Here's how to implement it: ``` // middleware.ts import { NextRequest, NextResponse } from 'next/server' const protectedRoutes = ['/dashboard', '/settings', '/api/protected'] const publicRoutes = ['/login', '/signup', '/'] export async function middleware(req: NextRequest) { const path = req.nextUrl.pathname ... const isPublic = publicRoutes.includes(path) const session = req.cookies.get('session')?.value ... // lib/dal.ts ## How to Implement Authentication with NextAuth in Next.js 15 and TypeScript https://medium.com/@askfaizanrathore/how-to-implement-authentication-with-nextauth-in-next-js-15-and-typescript-50b22baa1b5a Implement Authentication with NextAuth in Next.js 15 and TypeScript [ ifaizanrathore ... In this article, we will walk through the process of implementing **NextAuth** for authentication in a **Next.js 15** project using **TypeScript**. NextAuth is a great library for adding authentication to your Next.js app, and we’ll show you how to set it up with a **CredentialsProvider** (email/password login) and integrate it into your project step by ... * **Next.js 15** project with **TypeScript**. * A **Prisma** setup for interacting with your database. ... npm install next-auth bcryptjs prisma @prisma/client ``` ... Now, let’s set up **NextAuth** in your project. Create a file called `route.ts` under `app/api/auth/[...nextauth]` and ... // app/api/auth/[...nextauth]/route.ts
import NextAuth from 'next-auth'
import CredentialsProvider from 'next-auth/providers/credentials'
import bcrypt from 'bcryptjs'
import prisma from '@/lib/db' // Ensure you have prisma set up

export const authOptions = {
providers: [
CredentialsProvider({
name: 'Credentials',
credentials: {
email: { label: 'Email', type: 'email' },
password: { label: 'Password', type: 'password' },
},
async authorize(credentials) {
if (!credentials?.email ||!credentials?.password) {
... You have now successfully set up **NextAuth** for authentication in your **Next.js 15** app with **TypeScript**. This configuration uses the **CredentialsProvider** to authenticate users using their email and password. ... Nextjs Nextauth Authentication [ Types ## Implementing NextAuth with NextJS and MongoDB: A Step-by-Step ... https://www.deknows.com/blogs/full-stack-developement/implementing-nextauth-with-nextjs-and-mongodb-a-step-by-step-guide In this guide, we will walk through the process of implementing**NextAuth**with**Next.js 14**and storing users in MongoDB injust 7 easy steps. ## 1. Create a NextJS app ``` create-next-app@14 ``` ## 2.Install NextAuth by running ``` npm install next-auth ``` ## 3.Install bcrypt to hash passwords and Mongoose to store user data in MongoDB: ``` npm install mongoose bcrypt ``` ## 4.Create a database connection: Create a**db.js**file inside your**libs**folder and add the following code: ``` import mongoose from "mongoose"; const url = process.env?.MONGODB\_URI; let connection; ... **Create User Model** ** ** ``` import { Model, models, model } from "mongoose"; import { Schema } from "mongoose"; import bcrypt from "bcrypt"; const userSchema = new Schema({ email: { type: String, required: true, unique: true }, ... To authenticate users with**NextAuth**, you need to store user data in the database first. Since adding the signup route would make the blog longer, we will focus solely on NextAuth. Assuming you already have a simple signup API route set up where you store user data in the database. Let's proceed to ... ## 6.Write the below code for authentication with NextAuth. ``` import startDbConnection from "@/libs/db"; import UserModel from "@/models/userModel"; import NextAuth from "next-auth"; import CredentialsProvider from "next-auth/providers/credentials"; export const authOptions = { session: { strategy: "jwt", }, providers: [ CredentialsProvider({ type: "credentials", credentials: {}, async authorize(credentials, req) { const { email, password } = credentials; await startDbConnection(); ... ``` ## 7.Create a simple**login**component and render it inside the page. Ensure you have added the**use client**keyword at the top of your login component if you are using NextJS app router. Assuming you have set up the form and handle inputs, here is the function you need for submitting the form. ``` ... console.log(error); setLoading(false); } }; ``` **** That's it. By following these 7 steps, you can implement ## Next.js Authentication with NextAuth, Prisma, and MongoDB https://www.codingwithmuhib.com/blogs/nextjs-authentication-with-nextauth-prisma-and-mongodb Next.js Authentication with NextAuth, Prisma, and MongoDB Muhib Apr 21, 2025 ... In this article, we'll build a robust authentication system for a Next.js application using Auth.js (formerly NextAuth), Prisma ORM, and Mongodb. We'll cover everything from setting up the project to integrating social authentication providers like Google, GitHub, and Credentials signin. ## Prerequisites * Node.js (v20+) * npm or yarn * MongoDB Atlas account ... ### 1. Initialize Next.js Project ``` `npxcreate-next-app@latestnext-auth-appcdnext-auth-app` ``` ... `npminstallnext-auth@beta@prisma/client@auth/prisma-adapternpminstall-Dprisma` ``` ### 3. Initialize Prisma ... ## Authentication Configuration ### 1. Create Authentication Configuration **A.**In the root directory, create**auth.js**and add this code. Here, we need to configure the Prisma adapter by importing it and passing the db instance. Additionally, set the session strategy to jwt for authentication token ... ``` `importNextAuthfrom"next-auth";import{ PrismaAdapter }from"@auth/prisma-adapter";importauthConfigfrom"@/auth.config";importdbfrom"@/lib/db";ex portconst{handlers,auth,signIn,signOut}=NextAuth({adapter:PrismaAdapter(db),session:{strategy:"jwt"},...authCo ... `importGitHubfrom"next-auth/providers/github";importGooglefrom"next-auth/providers/google";exportde fault{providers: ... ``` ### 2. Create API Route for Authentication In**app/api/auth/[...nextauth]/route.js**: add this code ``` ... `GOOGLE\_CLIENT\_ID=your-google-client-idGOOGLE\_CLIENT\_SECRET=your-google-client-secretGITHUB\_CLIENT\_ID=your-github ... `importauthConfigfrom"@/auth.config";importNextAuthfrom"next-auth";const{auth}=NextAuth(authConfig) ... In auth.js, extend the config to manage session and JWT callbacks. This helps to persist additional user info in the ... }from"@/utils/users";exportconst{handlers,auth,signIn,signOut}=NextAuth({pages:{signIn:"/login",err ... Let’s create a simple login page where users can authenticate via Google or GitHub. \*\* app/login/page.jsx:\*\* ``` `"use client";import{ signIn }from"next-auth/react";import{ Button ... `exportconst{handlers,auth,signIn,signOut}=NextAuth({pages:{signIn:"/login",error:"/error",},});` ... `"use server";importbcryptfrom"bcryptjs";importdbfrom"@/lib/db";import{ getUserByEmail ... using an email and password. Update your auth.config.js file to include the Credentials: ... `importCredentialsfrom"next-auth/providers/credentials";importbcryptfrom"bcryptjs";import{ getUserByEmail }from"@/utils/users";exportdefault{providers: [Credentials({asyncauthorize(credentials){const{email,password}=credentials; ## Step-by-Step Guide: Integrate NextAuth v5 (Beta) with Credentials (JWT Sessions) into Next.js 15 App Using (App Router) https://javascript.plainenglish.io/step-by-step-guide-integrate-nextauth-v5-beta-with-credentials-jwt-sessions-into-next-js-2a9182504c85 NextAuth v5 (Beta) with Credentials (JWT Sessions) into Next.js 15 App Using (App Router) ... Sitemap Open in app Sign up Sign in Medium Logo Get app Write Search Sign up Sign in [## JavaScript in Plain English ... New JavaScript and Web Development content every day. Follow to join our 3.5M+ monthly readers. Follow publication ... # Step-by-Step Guide: Integrate NextAuth v5 (Beta) with Credentials (JWT Sessions) into Next.js 15 App Using (App Router) Doran Gao Doran Gao 20 min read · Apr 20, 2025 -- ... https://theonequote.app/image/5634/nova ***> “Even the tallest tower started from the ground.” — T.S. Eliot ... > Just as the grandest structures begin with a single stone laid firmly on the earth, effective learning and true understanding arise from engaging in activities step by step, steadily building upon foundational knowledge through deliberate practice and practical application. Approaching tasks in incremental stages not only clarifies complex processes but also empowers learners to achieve lasting mastery, transforming aspirations into achievements one step at ......