- Nady Shalaby
- Backend, Framework, Javascript, NestJs, NodeJs, Typescript, Web Development
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In NestJS, you can make a service available across all modules by declaring it in a global module. Here are the steps to do it:
Create a Service
If you haven’t already, create the service that you want to share using the NestJS CLI. For instance, to create a service called AppService, you would run the following command:
nest g service app
Create a Global Module
Next, create a module that you will declare as a global module. This could be the same module that the service is a part of, or it could be a separate module. For this example, let’s assume you’re creating a new module called GlobalModule:
nest g module global
Declare the Module as Global
In the global.module.ts file, you need to add the @Global() decorator from @nestjs/common to declare the module as a global module:
import { Global, Module } from '@nestjs/common';
import { AppService } from './app.service';
@Global()
@Module({
providers: [AppService],
exports: [AppService],
})
export class GlobalModule {}
In this code, the AppService is provided and exported by the GlobalModule, which is marked as global with the @Global() decorator.
Use the Service
Now, the AppService can be imported and used in any module in your NestJS application without needing to import the GlobalModule:
import { Module } from '@nestjs/common';
import { AppService } from './app.service';
@Module({
providers: [AppService],
})
export class SomeOtherModule {}
In this code, the AppService is imported and provided in SomeOtherModule, even though GlobalModule is not imported.
Remember that while global modules can be very convenient, they should be used sparingly, as they can make it harder to understand which parts of your application depend on which other parts. It’s usually best to explicitly import the modules that you depend on.
