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Resolving AUTH0_CONFIG Errors in NestJS Dynamic Modules

Learn how to tackle the `AUTH0_CONFIG` unresolved dependency error in your NestJS application by understanding dynamic modules and proper dependency injection practices. --- This video is based on the question https://stackoverflow.com/q/75371431/ asked by the user 'Joachim Rives' ( https://stackoverflow.com/u/11048997/ ) and on the answer https://stackoverflow.com/a/75373124/ provided by the user 'Micael Levi' ( https://stackoverflow.com/u/5290447/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Why can't NestJS resolve the dynamic module options parameter I added as a provider? Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- Resolving AUTH0_CONFIG Errors in NestJS Dynamic Modules: A Comprehensive Guide NestJS is a powerful framework for building efficient and scalable server-side applications. However, navigating its dependency injection and dynamic modules can sometimes lead to confusion and errors, especially regarding unresolved dependencies. One common issue developers encounter is the AUTH0_CONFIG error while integrating dynamic modules like AuthModule. In this post, we'll analyze the problem, provide a clear solution, and guide you through best practices for managing dynamic modules in NestJS. The Problem: AUTH0_CONFIG Unresolved Dependency When working with dynamic modules in NestJS, you might run into an error when trying to import your module in another module, particularly when dealing with configurations. In this scenario, you designed a dynamic module named AuthModule to supply different Auth0 tenant credentials to Auth0Service for each module that imports it. When trying to run the application, you received the following error message: [[See Video to Reveal this Text or Code Snippet]] This error occurs when NestJS can't find the required provider for AUTH0_CONFIG, which was meant to be injected into Auth0Service via the AuthModule. Let’s break down the structure of your modules to understand the issue better. Overview of Dynamic Module Configuration Here's how you structured your AuthModule: [[See Video to Reveal this Text or Code Snippet]] And your UsersModule imports the AuthModule as follows: [[See Video to Reveal this Text or Code Snippet]] Key Issues Identified You are trying to register Auth0Service again within the UsersModule, which leads to the need to re-register its dependencies (like AUTH0_CONFIG). The AUTH0_CONFIG provider is private to AuthModule and cannot be accessed in the scope of UserModule. The Solution: Simplifying the Provider Setup To resolve the AUTH0_CONFIG issue effectively, you need to avoid unnecessary duplication of providers within the UserModule. Here's how to do it: Remove Auth0Service from the providers array of UserModule: Since you are already exporting Auth0Service from AuthModule, you do not need to re-declare it in the UserModule. Update your UserModule as follows: [[See Video to Reveal this Text or Code Snippet]] Understand the Inclusion of Imported Providers: When you import a module like AuthModule, you are automatically including all providers that it exports, which means Auth0Service is already available for injection in your UserModule without needing to re-register it. Conclusion By simplifying the provider setup in your UserModule, you will no longer face the AUTH0_CONFIG unresolved dependency error. NestJS's powerful dependency injection mechanism allows you to effectively manage and use dynamic modules, so remember to utilize exports properly to keep your code clean and functional. If you continue encountering errors, check other configurations and ensure your modules are structured properly. Happy coding with NestJS!