When to use a free trial, a 100% Discount, or a $0 complimentary price in Clerk Billing, and what each option means for conversion and ongoing management.
A practical OAuth 2.0 + PKCE localhost-callback pattern for authenticating CLI users with Clerk.
Learn how to work with tRPC, Drizzle, Next.js, and Clerk by building a secure blog application
Take a Clerk app to production with a single, resumable command, all from your terminal.
Bootstrap a new project in seconds using Clerk CLIs init` command
The Clerk CLI gives your coding agents auth superpowers
A CVE has been released for a middleware-based route protection bypass affecting applications using createRouteMatcher in middleware or proxy.
A detailed postmortem of the outage on March 10, 2026, including timeline, root cause analysis, and remediations.
We're doubling down on making Clerk composable by default, with clear APIs and tools that work as well for human developers as they do for agents.
Learn how to implement multi-tenant API Key functionality in your SaaS platform without the complexity.
A detailed post-mortem of the system outage that occurred on February 19, 2026, including root cause analysis and planned remediations.
A detailed post-mortem of the DNS provider outage that occurred on February 10, 2026, including impact analysis and planned remediations.
Learn how passkeys enable passwordless authentication with phishing-resistant cryptography. This tutorial walks through a complete Next.js WebAuthn implementation, covering registration and authentication flows.
Recognition highlights Clerk’s rapid customer adoption
Learn all about JWTs: what they are, how they are created, and how to verify them in a Next.js application
Funding will be used to advance Agent Identity, expand products, and elevate developer experience.
Learn about the various authentication options available when using Next.js app router, and how to properly secure access to protected areas of your application.
A detailed post-mortem of the database incident that occurred between September 14-18, 2025, including root cause analysis, timeline, and remediation steps.
Learn how Next.js authentication works by implementing JWTs from scratch, including user registration, sign-in/sign-out functionality, and middleware protection.
Clerk Billing now supports free trials to help developers boost conversion rates and reduce buyer friction.
On August 28, 2025, a credential stuffing attack caused elevated API latency and errors. This postmortem details the impact, root cause, and remediations.
Introducing Mosaic, our new Figma design system that mirrors every Clerk UI component. Design and prototype auth flows that look and feel like your product before writing a single line of code.
Learn what multi-tenant authentication is, common pitfalls and use cases, and how Clerk can help simplify implementation.
Multi-tenancy offers scalability benefits but requires careful design for tenant isolation, performance, and compliance. Learn about five potential caveats when implementing multi-tenancy in your B2B applications.
See how Clerk's new regional failover kept services running during a cloud provider outage.
Learn how to add multi-tenancy to your React Native & Expo app using Clerk and Supabase.
Explore the top 5 projects from the MiduDev/Clerk Hackathon, showcasing creativity, technical skills, and community engagement.
Build a cross-platform time tracking app from scratch with React Native and Expo, implement secure authentication with Clerk, and set up data storage using Supabase.
Learn how to transform your single-user app into a team-ready B2B platform using Clerk Organizations with Lovable and Supabase.
Learn how to vibe code a secure app with Clerk, Lovable, and Supabase
Multi-tenancy is one of those architectural decisions that pays off early and compounds over time. Clerk enables you to build multi-tenant authentication with ease.
What's the difference between multi-tenant and single-tenant SaaS architecture? This guide breaks down the pros, cons, and use cases of each model—so you can choose the right B2B SaaS architecture for your app. Learn how multi-tenancy scales efficiently, when single-tenancy is the better fit, and which modern tools make tenant isolation easier than ever.
Learn more about our service outage, including the timeline of events and our next steps.
Learn how to design a multi-tenant SaaS architecture that scales from your first 10 users to your next 10,000.
Learn what multi-tenancy is, why it matters for B2B SaaS apps, and how it shapes your architecture decisions.
A practical guide to OAuth Scoped Access that walks through the Authorization Code Flow with real code examples, security best practices, and clear explanations of how third-party app integrations actually work.
Learn how to synchronize user data from Clerk to Supabase with webhooks and Supabase Functions
Learn how to quickly monetize your SaaS with subscriptions powered by Clerk Billing.
Learn how to build a complete billing experience with Clerk and Stripe, from subscriptions and usage-based pricing to role-based access—no custom UI or webhooks required.
How to use Clerk's Tinybird JWT template to secure Tinybird APIs for fast, easy, and secure user-facing analytics in your multi-tenant application.
Huntr shares how migrating to Clerk gave them transparent pricing, responsive support, and a developer-first experience.
Step-by-step guide for developers to launch a Clerk app in a production environment with a custom domain, OAuth credentials, and secure DNS configuration.
Learn how to launch your app with a production instance of Clerk to maximize security and user limits.
An example-packed guide to writing effective tests for Clerk applications, covering everything from integration testing with React Testing Library to end-to-end testing using Playwright.
Learn how to build B2B applications with Clerk and Supabase.
Learn how Supabase works with Next.js to increase security and reduce development hours, and how Clerk integrates with this stack.
Learn how Supabase Auth works and how Clerk can provide more capabilities in less time.
On March 21, 2025, Next.js disclosed a critical security vulnerability, CVE-2025-29927, that may impact your application.
Learn how to work with tRPC, Prisma, Next.js, and Clerk by building a secure blog application
Learn how to enrich PostHog events with Clerk user data to better understand your users and their actions on your website.
Learn a security-first approach to building web applications by building a secure project management platform with Next.js.
Learn how to validate a new SaaS idea with a Clerk waitlist and Loops newsletter.
Learn more about our service outage, including the timeline of events and our remediations.
Learn Role-Based Access Control (RBAC) by building a complete Q&A platform.
Learn how to capture user credentials and save them securely with Argon2 password hashing.
Learn how to implement session-based authentication into a Next.js application from scratch.
Learn how to add Google authentication to your Next.js app, implement a user button for profile management, and enable Google One Tap using Clerk.
Learn all about middleware in Next.js and how it works, as well as some of its common use cases, in this comprehensive guide.
Learn all about metadata and how to set it in your Next.js application
Explore the best practices and techniques you can use to set environment variables in Node.js, ensuring your app runs smoothly across different environments.
Learn how session-based authentication works and how to implement it in a React app with Express.
Learn how to implement per-user OAuth scopes with Clerk.
Learn how to use Clerk to access data on behalf of the current user to request their availability from Google Calendar using an open-source, live demo application.
Learn how to automatically enroll new users into your SAML-enabled enterprise customers.
EASIE SSO brings Clerk’s signature simplicity to a notoriously agonizing corner of authentication.
Learn how to use Clerk user data to secure access to rooms in Liveblocks.
In this guide, we will cover how to use Clerk with Express to authenticate API requests using ClerkExpressWithAuth() and ClerkExpressRequireAuth() middleware.
Learn about how leveraging the benefits of both session token authentication and JWTs results in the best of both approaches.
Learn how to integrate Clerk with Supabase by building a task manager.
Learn when to use Clerk Webhooks or the Backend API to efficiently access user data and avoid unnecessary complexity.
Learn about schema migrations and how they can be applied to a Neon database with Drizzle and GitHub Actions
Learn how to access data about the currently authenticated user with Clerk's APIs and session claims.
Learn what role based access control is and how to use it with Clerk Organizations to simplify permissions management.
How Clerk mitigated the recently discovered Open Response Type vulnerability
Learn how to architect a B2B application for per-user licensing with Stripe and Clerk Organizations
Use Clerk Organizations to build a task management app that isolates tasks to specific teams.
Using custom flows, webhooks, and user metadata, learn how to build a single form that automatically subscribes new users.
Clerk is funding the development of Zod 4 with a new Open Source Fellowship program.
Learn how to build a modern, authenticated chat application using Next.js, Ably, and Clerk. This comprehensive guide covers everything from setting up real-time messaging and user authentication to implementing roles and message history.
Learn how to use Clerk user metadata to build a waitlist for your application, as well as an admin dashboard to toggle user access.
Learn how to configure your Next.js applications to send Clerk user data to PostHog for analytics and data analysis.
Learn what API Gateway authorizers are, how they work, and how to use them with Clerk to secure your API endpoints using JWT and Lambda authorizers.
Passkeys allow for a simple, yet extremely secure, sign-in experience. Learn more about what they are and how they work in this article.
We compare authentication in React.js and Next.js, emphasizing the ease of securing user data with Clerk.
Leverage Clerk’s customizable session tokens, publicMetadata and Next’s Middleware to create a robust onboarding experience within a few lines of code.
Extend your Radix powered custom User Menu to turn it into a Sign In or User Profile component
We are excited to announce that Clerk has teamed up with Inngest and Svix to integrate with external systems reliably.
New funding will accelerate expansion beyond authentication, into authorization
Wow! We had an incredible year in 2023, here is a list of everything we shipped...
Test the emoji game of all the movie buffs you know by building a Movie Emoji Quiz app with Remix, Fauna, and Clerk.
In this post, we discuss the benefits of email magic links, show examples of how they work, and explain why they meet the requirements for secure, passwordless authentication.
Quickly and easily build a custom user menu for your application leveraging Clerk's hooks and methods and building on Radix primitives for a custom UI.
Authorization is now a core feature of Clerk – learn more about our new authorization helpers for B2B SaaS
Introducing NEW pricing for Clerk – a Pro Plan with additional features, Pro Add-Ons to fit your application's use case, and 10,000 MAUs free on all plans
Discover streamlined Next.js authentication with Clerk, simplifying SSR for efficient user data handling in web development.
This post covers how to synchronize user data from Clerk into a Convex database using Webhooks.
Utilize Clerk Metadata & Stripe Webhooks for efficient user data management and enhanced SaaS experiences with our step-by-step tutorial.
In this guide, you will learn best practices for implementing secure authentication in your Next.js app.
User impersonation enables support teams to assist customers without compromising privacy and security, essential for delivering great CX.
Learn how to get started with Webhooks to build integrations in a Nextjs application with Clerk's fully-featured authentication.
Session management allows users to stay logged in across multiple tabs devices and maintains security by tracking user sessions.
Learn how to implement passwordless authentication in Next.js using magic links, social OAuth and SAML SSO.
How We Roll is a deep dive into how Clerk implements authentication. This chapter provides a roundup of the topics discussed in this series.
How We Roll is a deep dive into how Clerk implements authentication. This chapter covers the infrastructure that powers Clerk’s authentication capabilities.
This article explores password authentication, risks, and better solutions like SSO, MFA, and passwordless login.
Learn how one-time passwords work, best practices for using OTPs in authentication, and how to implement OTPs in Next.js.
In this tutorial we will use Clerk with Hasura to build a full-stack Next.js app with a database and GraphQL API, all without having to write any backend code.
Branching off from the excellent (and mighty) Redwood tutorial, the guide will lead you through setting up Clerk as the authentication provider.
How We Roll is a deep dive into how Clerk implements authentication. This chapter covers how Sessions unlock security and performance capabilities for Clerk.
How We Roll is a deep dive into how Clerk implements authentication. This chapter covers how Clerk integrates with BaaS providers with JWT SSO.
Already know the /pages directory? Here's a simple way to migrate to the /app directory in Next.js 13.
In this article, we explore how to incorporate OAuth SSO into a Next.js project with JSON Web Tokens (JWTs) and the new app router from Next.js.
How We Roll is a deep dive into how Clerk implements authentication. This chapter explores how we help developers ship a fully-featured account management UI.
In this tutorial, we'll explore how to use Clerk with Express to authenticate API requests using middleware.
How We Roll is a deep dive into how Clerk implements authentication. This chapter covers the various ways developers can customize Clerk's UI components.
How We Roll is a deep dive into how Clerk implements authentication. From codes to links to SSO, this chapter is about when and how we verify emails.
In this guide, you will learn how to implement email magic links in Next.js.
How We Roll is a deep-dive into how Clerk implements authentication. This chapter is on something you know and something you have: multifactor authentication!
The team has been focused on making a first in class experience for your end users when it comes to passwords. Let's talk about the new features we introduced.
How We Roll is a deep-dive into how Clerk implements authentication. In this chapter, we discuss why avatars should never be an afterthought.
How We Roll is a deep-dive into how Clerk implements authentication. In this first chapter, we discuss passwords – the original form of authentication.
Learn how Clerk's user-friendly authentication system streamlined OpusFlow's SaaS integration, enhancing productivity and performance.
App Router support is out of beta, plus we've launched a major middleware update.
Learn the significance of UUIDs in full-stack apps, their optimal usage, and how to implement them in React apps.
Learn how to set up cookies in React with this guide! You'll create a login page and store user information using cookies.
Learn how to implement JSON Web Token (JWT) authentication in a React app using a standard flow, and how Clerk can make the process even easier.
Explore the benefits of global state and discover two methods to implement it: the React context API and the Clerk React context API component.
Learn how to protect your React app from spam and abuse using reCAPTCHA. Follow this tutorial to create a sign-up form with reCAPTCHA validation.
Learn how to implement OAuth 2.0 in a React app for user authorization. OAuth 2.0 lets users share information securely without passwords.
Clerk surpasses a million managed users and taps into executive experience from Auth0 and Vercel
We switched to the familiar Publishable Key, but we changed less than you'd think
Create a complete login and sign-up flow with React Bootstrap forms, then learn how to use tools like Clerk to easily manage authentication and authorization.
Compare adding Google Login to your Next.js 13 Application by building it yourself, with using a third-party service like Clerk.
Learn how conditional rendering is used to show a personalized UI, complete a user flow without changing routes, or show a loading or error state.
Learn how to create protected routes using React Context as well as how using Clerk makes this process easier.
API routes in Next.js provide a solution to build server-side API logic.
This guide shows you how to integrate Clerk into T3-Turbo so you can have user management for everyone.
Clerk is building the future of authentication for React, where the Component is the new API
Stop your Next.js middleware from running on static assets like images and Next.js internals
JWTs have won. It's time we embrace them and fix the dangerous implementations.
Compute a value in middleware and pass it to your API route or getServerSideProps. Works in both Node and Edge runtimes.
New in 4.5: Authentication moves to middleware, switchable runtime support, improved developer experience, preparation for Layouts
Passwordless Authentication is on an upward trajectory thanks to advancements in this space and recent password breaches.
Webhooks allow apps to communicate with one another. Find out best practices and more here.
While an SDK and an API often work together in the software development process, they each serve a different function. Find out what that is here.
Clerk is the only authentication service that offers a User Profile component. It sounds incremental, but it's 10x more work – this post explains why
User management assists in authenticating and storing users. Find out more about it here.
Authentication is one of the most critical functions of securing your applications; however, it's also one of the most challenging functions to implement.
Clerk is an easy-to-use, customizable, and secure customer identity platform that provides you with multiple authentication strategies for your application.
A blog post about the story of Clerk; our journey of bringing seamless authentication to the Modern Web, where we stand now, and what lies ahead.
Next.js is a framework in the React ecosystem that is primarily used for developing JavaScript applications. Understand the ins and outs below.
Clerk powers authentication for over 5,000 Jamstack teams – now we're working with Netlify to further our commitment to the ecosystem
Understand the differences between authentication vs. authorization and the purpose they both serve.
We built use-stripe-subscription to make it easier for React developers to implement Stripe Billing
Build an app with complete authentication and a user switcher just like gmail has.
A custom Remix stack with Clerk, Fauna, and Netlify.
For optimal developer experience, React SDKs require completely different patterns than Node
Next.js SSR authentication is easy with Clerk – just a few lines of code to get started.
CORS preflights add unnecessary latency to requests. Learn to use "simple" requests to skip the preflight entirely.
Stateful authentication is more secure. Stateless authentication is faster. A hybrid approach delivers the best of both worlds.
We integrate with a lot of React frameworks - here's what we love most about our Remix authentication package
React Components are the future of APIs – but how can developer tools companies enable robust customization? We explore two strategies.
Only 30% of Clerk customers use webhooks to sync user data into their own database. Instead, most skip syncing and use our APIs to retrieve data in real-time.
Clerk is saving Web3 developers from the greatest evils of the Web2 platform: cookies, multifactor authentication, and profile enrichment
In this next part, we'll discuss how to identify 'core' vs. 'non-core' development & how thoughtful outsourcing can be used to develop process power.
Software has eaten the world and almost every business is a software business. How do you develop a competitive advantage and win in today's software economy?
JSON Web Tokens, more commonly known as JWTs, are encoded and cryptographically signed data that allows for the secure transfer of information.
Authentication saw a resurgence as developers demanded better tools for Modern Web frameworks like Next.js, and users demanded easier sign-in options
The same way we would rather let Stripe handle your credit card, we'll let Clerk handle your phone numbers, emails and sessions.
A case study of how Trading Experts used Clerk to quickly implement the authentication and user management features they needed.
Seeking experts in CSS, browser APIs, JS bundling, React, react-native, Swift, Kotlin and Developer Experience
Learn why bcrypt is the industry standard hashing algorithm for authentication - including its history and how it compares to other protocols.
Learn the history of passwordless, and how it became popularized. From OTPs to MFA to mobile.
Learn what session management is, the attacks it prevents, and how Clerk handles session lifetime, revocation, device activity, and audit logs.
Learn about “forgot password” flows, how they work, and the best practices to keep in mind.
Learn how to add authentication and user management to your Gatsby app with Clerk.
Add a complete authentication workflow with authenticated access to your Prisma API layer to your web application.
Learn how Clerk generates resource IDs with inspiration from Stripe and Segment.
Protect your Firebase Cloud Functions with user authentication using Clerk.
Learn how to add complete user authenticated access to your Airtable data API using Clerk.
Learn how to connect Clerk as an authentication and user management solution together with your Firebase as your backend.
Clerk raised a $4 million seed round led by S28 capital with Andrew Miklas (cofounder, PagerDuty) joining our board.
Key insights on building fast sign in forms with Social Sign In, password-based, and passwordless authentication.
In this article, you'll learn the pros and cons of developing or buying a user management system so you’re ready to make the right choice for your project.
Due to the evolution of tooling and the shift towards high-velocity product development, End To End testing is a regular topic of discussion for small teams.
Learn to build a to-do app using Clerk for authentication, Hasura for data storage and access, and Next.js for the frontend.
HttpOnly cookies do not prevent cross-site scripting (XSS) attacks, but they do lessen the impact and prevent the need to sign out users after the XSS is patched. HttpOnly cookies are not a substitute for XSS prevention measures.
If you are looking to implement Auth in the easiest way possible, this is the tutorial for you. Deploy in 5 minutes.
The task came with a sense of helplessness. We knew what "great" looked like, but it was impractical to build all of that functionality.