When the monthly bill for a popular authentication service reached $427 for a side project with 12,000 monthly active users and zero revenue, the decision was made to switch to an open-source login library. The 30-minute spike that followed was a remarkable experience, showcasing the ease and speed of replacing Auth0 with an open-source alternative. In this article, we’ll delve into the specifics of the switch, highlighting the challenges, the chosen library, and the benefits of adopting an open-source solution.
Breaking Down the Auth0 Bill
The Auth0 bill was a significant concern, especially considering the project’s revenue was close to zero. The pricing jump at the 1,000 MAU line added to the problem, making it essential to explore alternative solutions. The cost of $427 for a login button was not justifiable, especially when the project’s needs were met by a smaller, more cost-effective solution.
The Need for an Open-Source Login Library
The author’s experience with Auth0 was not entirely negative. In fact, it was a product they had shipped at two previous companies without any issues. However, the main concern was the cost of using a service that was not tailored to their specific needs. What they wanted was a library that covered the essential features and allowed them to run it on their own Cloudflare Workers without rebuilding everything from scratch.
Exploring Open-Source Alternatives
The author’s search for an open-source login library led them to four potential solutions. Lucia was ruled out due to the author’s preference for a library that was still actively maintained. Better Auth was another option, but its documentation for Cloudflare Workers was lacking. NextAuth/Auth.js was a promising solution, but its tight coupling to Next.js made it unsuitable for the author’s needs. This led them to explore kavachOS, an open-source library that offered a wide range of features and was well-documented.
kavachOS: The Chosen Library
kavachOS was the final choice, and the author was impressed by its ease of use and flexibility. The library provided a comprehensive set of features, including authentication for humans and AI agents, session management, and support for various OAuth providers. The documentation was thorough, and the migration guide made it easy to transition from Auth0.
Implementing kavachOS
The implementation process was swift, with the author timing the entire process at 32 minutes from installing kavachOS to having a working login on localhost. The core configuration was straightforward, and the adapter for Cloudflare Workers made it easy to integrate the library into the existing infrastructure. The author was pleased with the simplicity of the process and the minimal amount of code required to get up and running.
The Schema and Database
kavachOS ships with a schema that includes six tables: users, sessions, oauth_accounts, password_reset_tokens, magic_link_tokens, and email_verification_tokens. The author ran the migration script to create these tables, which were found to be well-designed and easy to understand. The schema was a significant advantage, as it provided a clear structure for storing user data and authentication information.
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Frontend and Backend Integration
The frontend integration was relatively simple, with the author implementing a useSession() hook, a login form, a magic link form, and an OAuth button component. The backend integration was also straightforward, with the author mounting the auth routes under /auth/* and implementing a get /me endpoint to retrieve the current user’s information.
Conclusion
The switch from Auth0 to an open-source login library was a successful one, with the author completing the process in under 30 minutes. The chosen library, kavachOS, provided a comprehensive set of features and was easy to implement. The schema and database provided a clear structure for storing user data and authentication information. This experience highlights the benefits of adopting an open-source solution, including cost-effectiveness and flexibility. As more developers look for alternatives to Auth0, kavachOS is certainly a library worth considering.
Why Choose an Open-Source Login Library?
Choosing an open-source login library offers several advantages, including cost-effectiveness and flexibility. By adopting an open-source solution, developers can avoid the costs associated with proprietary services like Auth0. Additionally, open-source libraries often provide more flexibility, allowing developers to customize the code to meet their specific needs. This is particularly important for projects with unique requirements or those that need to integrate with existing infrastructure.
Key Benefits of Open-Source Login Libraries
- Cost-effectiveness: Open-source libraries eliminate the costs associated with proprietary services.
- Flexibility: Open-source libraries provide more flexibility, allowing developers to customize the code to meet their specific needs.
- Community support: Open-source libraries often have a large community of developers who contribute to the code and provide support.
- Customization: Open-source libraries can be customized to meet the specific needs of a project.
Common Challenges When Switching to an Open-Source Login Library
Switching to an open-source login library can be challenging, especially for developers who are used to working with proprietary services. Some common challenges include:
- Learning curve: Open-source libraries often require a learning curve, especially for developers who are new to the technology.
- Customization: Open-source libraries can be customized, but this can also be a challenge, especially for developers who are not familiar with the code.
- Community support: While open-source libraries often have a large community of developers who contribute to the code and provide support, this can also be a challenge, especially for developers who are new to the technology.
Best Practices for Implementing an Open-Source Login Library
Implementing an open-source login library requires careful planning and execution. Here are some best practices to keep in mind:
- Choose a library that meets your specific needs.
- Read the documentation carefully and understand the library’s features and limitations.
- Test the library thoroughly before implementing it in your project.
- Customize the library to meet your specific needs, if necessary.
- Provide clear documentation and support for your project.
