How do you implement a plugin system using dynamic modules in NestJS?

Q: How do you implement a plugin system using dynamic modules in NestJS?

// Plugin interface contract export interface NestPlugin { register(options?: any): DynamicModule; } // Plugin implementation @Module({}) export class AuditPlugin { static register(options: AuditOptions): DynamicModule { return { module: AuditPlugin, providers: [ { provide: AUDIT_OPTIONS, useValue: options }, AuditService, ], exports: [AuditService], }; } } // Core module accepts plugins dynamically @Module({}) export class CoreModule { static withPlugins(plugins: DynamicModule[]): DynamicModule { return { module: CoreModule, imports: plugins, exports: plugins, }; } } // AppModule assembles everything @Module({ imports: [ CoreModule.withPlugins([ AuditPlugin.register({ logLevel: 'verbose' }), MetricsPlugin.register({ endpoint: '/metrics' }), ]), ], }) export class AppModule {} Open/closed principle — add plugins without modifying the core module. Each plugin is independently configurable via its register() options. Plugins are standard NestJS modules — they can declare controllers, guards, and interceptors. Plugin providers are available to the rest of the app through CoreModule re-exports.

Difficulty: 7/10

Dynamic Modules, Plugin Architecture, Dependency Injection

Define a plugin interface where each plugin returns a DynamicModule from a static register() method. A core module accepts an array of DynamicModule objects at import time, imports and re-exports all of them, allowing the application to be extended by assembling plugin modules in AppModule.

Plugin system using dynamic modules

Benefits of the dynamic plugin pattern:

1
Open/closed principle — add plugins without modifying the core module.
2
Each plugin is independently configurable via its register() options.

How do you implement a plugin system using dynamic modules in NestJS?

Define a plugin interface where each plugin returns a DynamicModule from a static register() method. A core module accepts an array of DynamicModule objects at import time, imports and re-exports all of them, allowing the application to be extended by assembling plugin modules in AppModule.

Scenario Questions

Follow-up Questions