Nestjs use service from another module. For example: I have my loggingModule import { Module } fr.

Nestjs use service from another module. module and importing another module called DB. io/nest-js-inject-service-from-another-module-cf85987398d52. The next middleware function is commonly denoted by a variable named next. Feb 13, 2020 · I have a boilerplate project with Nest. js, focusing on creating feature modules with service providers. Ensuring your module structure is consistent and complete will prevent common runtime issues. In this article, I wanna explain how to deal with this inside NestJS’s dependency inversion ecosystem by a simple project we are going to create from scratch. js module, that you can import "as is" from util, and declare as a custom Provider from your NestJS app. Remember that Node. Since all the methods in my service need to use the adapter initialized by the factory service, I was Apr 3, 2024 · In this article, we’ll delve into the various aspects of modules in NestJS, including basic module creation, shared modules, importing other modules, global modules, and dynamic modules. May 29, 2025 · A service depends on another provider or repository that hasn’t been properly registered. service. By leveraging HttpService and understanding REST principles, you can build robust and scalable APIs in your NestJS applications. ts in which i want to call project. Basically, I have a module that comes from an external library, that handles fetching secrets from AWS secrets. For instance, you might need an HTTP service for making backend calls. To use a namespaced configuration as a configuration object for another module in your application, you can utilize the . This is done by editing the module file (app. A required module hasn’t been imported. How to inject websocket instance in controller or another component? Mar 25, 2022 · The NestJs documentation on modules states the following Now any module that imports the CatsModule has access to the CatsService and will share the same instance with all other modules that import it as well. import { Module } from '@nestjs/common' import { AuthService } from '. In terms of dependency injection, global guards registered from outside of any module (with useGlobalGuards() as in the example above) cannot inject dependencies since this is done outside the context of any module. There is a circular dependency between modules. How does dependency injection work in NestJS? Jan 14, 2025 · Final Thoughts: By adding the correct @InjectModel decorators and ensuring that dependencies are properly registered and imported, you can resolve dependency injection errors in NestJS. Why do I need to import all the required entities directly from various modules into other I'm trying to make a request from a controller from Module A, to another controller in Module B. The module encapsulates providers by default, meaning you can only inject providers that are either part of the current module or explicitly exported from other imported modules. Feb 25, 2020 · When trying to use another global module's service from one global module, I get an error thrown by NestJs at launch time. Often, a controller has multiple routes, and each route can perform a different action. That module exposes a HttpService that has such configuration. You can create a global module. ne May 1, 2023 · (Updated) First, I need to clarify that for nestjs, there is an axios wrapper that you can use with the http module, using the http service, that is based in the library nestjs/axios, so if you Jun 13, 2025 · Real-World Use Cases: Enterprise APIs with strict module boundaries and RBAC. Jul 15, 2019 · Here the framework creates the instance for you when you add the service to the provider. It simplifies the process of loading configuration variables from various sources such as environment variables and configuration files. forFeatur May 9, 2024 · Why do we use dependency injection? When you’re developing a smaller component of your system, such as a module or a class, you often require functionality from other classes. js doesn't follow the request/response Multi-Threaded Stateless Model in which every request is processed Apr 27, 2025 · Conclusion In this module, we explored how to work with HttpModule in NestJS to make HTTP requests to external RESTful APIs and how to create RESTful APIs using NestJS controllers and services. Nov 22, 2018 · I want to use environment variables to configure the HttpModule per module, from the docs I can use the configuration like this: @Module({ imports: [HttpModule. This service will get injected later when we use our @Logger() decorator. ts, the @Injectable() decorator Nov 8, 2019 · There are two ways to use repository pattern in nestjs with typeorm: Using default repository of typeorm. Nest is a framework for building efficient, scalable Node. The exported providers from a module essentially serve as the module's public interface or API. Nest middleware are, by default, equivalent to express middleware. service'; @Module({ controllers: [CatsController], providers: [CatsService], }) export class AppModule {} What exactly is happening under the covers to make this work? There are three key steps in the process: In cats. We have a connection pool to the database, singleton services with global state, etc. Using two sample modules, learn how the process of exporting and importing services works. js server-side applications using TypeScript and combining OOP, FP, and FRP principles. register({ timeout: 5000, Jun 14, 2021 · I tried looking for answers on the nestjs docs and github and this question: Nestjs Dependency Injection - Inject service into service, but couldn't find any, only a circular dependency . Module, but I am getting the following error if I am not Oct 31, 2018 · I have a service/provider, let's say it's call ServiceA1, in a module A marked as @Injectable (). Middleware functions have access to the request and response objects, and the next() middleware function in the application’s request-response cycle. But what if we Jun 25, 2023 · In NestJS, services are an essential part of the application, and they can be injected and used across different modules. Below snippet shows how to use dependency injection. In another way, how to share and export a service and import it into another module. js HTTP client library Another way to invoke a service from another module is to create an export with an SCA binding and then save the export. Using your own custom repository. Middleware Middleware is a function which is called before the route handler. Indeed, only is needed that the service you want to inject into other entity managed by NestJs, is exported from your AuthModule, and AuthModule imported in the Module you want other entities have injected your AuthService. js server-side applications. Sep 3, 2023 · Understanding the Concept of Module, Controller, and Service in NestJS In the realm of modern web development, frameworks and technologies are constantly evolving to meet the demands of developers … Mar 6, 2023 · I'm trying to use a custom provider in NestJS to override the original service implementation with a new implementation (such as the example of the CatsService in the documentation: https://docs. Nest wraps Axios and exposes it via the built-in HttpModule. The root module is basically the starting point that NestJS uses to build the application graph. Level up your programming skills with exercises across 52 languages, and insightful discussion with our dedicated team of welcoming mentors. Sep 24, 2018 · In this tutorial, we will be covering how to create a and use a provider in NestJS and how to make HTTP requests. Our basic requirements for this service are: A method which can log messages to stdout A method which can set the prefix of each instance Once again we will use the NestJS CLI to bootstrap our module and service. In this piece of code, you use the @Injectable() decorator to declare the DatabaseService and BlogService indicating that they are both providers that NestJS can inject. @Module({ controllers: [PostController], providers: [PostService, 1:18:35 - Anastasiia M. Nov 24, 2022 · But, remember that in NestJS if you want to share providers across the module, you have to import the source / the hosting module, not just provide the specified provider you want to use. Jun 11, 2024 · Create a new file http. In nestjs modules are defined as classes with the @Module decorator that takes a object as input which has sections (properties) to create the relationship between modules, providers and controllers: Providers . controller. Mar 11, 2024 · In NestJS, you don’t manually instantiate classes with new keyword, NestJS framework’s DI container does it for you under the hood. Oct 4, 2023 · Injecting a service from a different Nest. Mar 13, 2023 · How can I access the server instance from a WebSocketGateway in another service within the same module in NestJS? I have tried injecting the WebSocketAdapter provided by the platform-socket. Injection scopes For people coming from different programming language backgrounds, it might be unexpected to learn that in Nest, almost everything is shared across incoming requests. If it is enabled, then "this" would be strictly use the PropertyDescriptor Jan 3, 2023 · But i can just use the regular import provider from path/to/provider statement to import the provider and use it anywhere, even outside the module, so its not impossible like they said and the only way to do it is to import it in the imports field of the @Module() decorator in order to use it. Following the documentation: If you want to use the repository outside of the module which imports TypeOrmModule. In order to solve this issue, you can set up a guard directly from any module using the following construction: content_copy Apr 27, 2025 · In this module, we will explore how to create reusable libraries and shared modules in NestJS, allowing you to create functionality that can be easily shared across different parts of your application or even across different projects. HTTP module Axios is a richly featured HTTP client package that is widely used. I'm hoping the methodology will be similar to that of the asyncProvider but right now I'm just waiting to see what the project owner decides. If it isn't in current module, check it is global Uploaded minimal repo of above code here. From basic service injection to complex use cases involving custom providers, scope, and third-party libraries, mastering DI is essential for any NestJS developer. With it, you can import modules, inject providers and then use those providers in a factory function that returns the configuration object: JwtModule. /AuthService' @Module({ providers I am trying to use a typeorm custom repository defined in another module. May 18, 2025 · Struggling to inject a service from another module in your NestJS app? This guide simplifies the process, solving errors like Nest can't resolve dependencies. GraphQL backends with code-first schemas. I don't recommend using it from outside of Nestjs modules Aug 17, 2021 · I have one Gateway and another Service in the same module, the gateway needs access to the service to work, but I also want to inject the gateway into the service which needs the reference to send events directly to the clients. I am trying to inject a repository from a different module into a service but I receive the following error: Nest can't resolve dependencies of the CasbinService. Jun 9, 2022 · either to inject your module or service (with providing if not module) in AppModule if you connect your guard or use @Global() decorator for your module with service, e. registerAsync({ imports: [ConfigModule], useFactory: async (configService: ConfigService) => ({ secretOrPrivateKey: configService. ts's api endpoints, i was able to call it by doing something like this // mod. Nest complains that it cannot resolve the dependency. Repository classes are actually supposed to have connections and entity managers passed to them in the constructor to allow for communication with the database. Jun 6, 2018 · welljs commented on Jun 7, 2018 But why you cannot inject AuthService into ProfileService (extra data service)? First I decided to create shared module with its own controller, routes, middleware, providers etc, and import that module into applications. The HttpModule exports the HttpService class, which exposes Axios-based methods to perform HTTP requests. Another way to invoke a service from another module is to create an export with an SCA binding and then save the export. You forgot to export a service from a module when used elsewhere. Dec 31, 2023 · This tutorial explains how to inject Service from one mon=dule to another module in the NestJS application with an example. When I try to inject that service into another service I get Error: Nest can't resolve dependencies of the AService (?). ts JS Feb 12, 2021 · How to inject a nestjs service into another service when both belong to the same module? Asked 4 years, 8 months ago Modified 4 years, 8 months ago Viewed 13k times Mar 14, 2023 · nestjs- use service from another module in interceptor Asked 2 years, 7 months ago Modified 2 years, 7 months ago Viewed 326 times NestJS is a framework for building efficient, scalable Node. register() to configure our Axios instance. To create a basic controller, we use classes Jan 26, 2022 · in my nestjs app I have a service which use a factory service to initialize some kind of adapter. Locate the export in the Business Integration view, and drag it to another module. When I add it by injection: import { Injectable } from '@nestjs/common'; import { InjectModel } Jan 1, 2024 · Introduction In NestJS, services encapsulate business logic and can be shared across different parts of your application. For example, when using the HttpModule module from @nestjs/axios we can use the dynamic module HttpModule. Birthday CelebrationUseful links:1. io package, but it doesn't seem to work. This is common and very useful when you wish to configure a dynamic module at app Jan 1, 2024 · Conclusion Utilizing Dependency Injection in NestJS allows developers to write modular, testable code with ease. However, when services are defined in different modules, you need to understand the module dependency injection system to use them. Why should I use modules? Jul 19, 2023 · I am new to nestJs, and I am creating a module called example . ts) and adding the service to the providers array in the @Module() decorator. /'; @Global() @Module({ providers: [ KeyService ], exports: [KeyService] }) export class ApiModule {} Then inject service into guard like this // guard export class ApiGuard implements CanActivate { constructor(@Inject('KeyService') private readonly Aug 17, 2019 · Logger service Let's start off with our LoggerService. mod Oct 27, 2021 · I have a Post module which contains a controller, an entity class and two services - PostService and PostCacheService. js using postgresql with TypeORM. This can help reduce code duplication, improve May 27, 2024 · A Practical Guide to Nest JS Modules, Controllers, and Services Modules NestJS helps organize code into modules to make it easier to manage and grow. Apr 5, 2022 · As you can see, every application has at least one root module (the application module). /cats/cats. c May 1, 2021 · I'm trying to extend a class service from another class service in NestJS and using DI to load it in a third service. forFeature([User])], // Typeorm will register a repository for your user entity internally providers: [UsersService], controllers: [UsersController], }) export class UsersModule {} And in Nov 27, 2020 · I've got a PlayersModule and an ItemsModule. Dependency Injection (DI) is a design pattern and mechanism that facilitates the creation and provision of certain application parts to other parts Is it possible to inject a service into a factory provider from the same module? I have a service AppService that I would like to use in this factory provider below. Jan 8, 2020 · Creating and Using the Service There are two types of services that can be created in NestJS: Class-based Provider Non-class-based Provider Note: If you are coming from Angular, there are high Jan 8, 2020 · We learned about how to create and use different types of providers in NestJS, we used the dependency injection design pattern to use services, which lets you achieve single responsibility as well. . Discover how to effectively use a service from another module in a NestJS interceptor. Real-time applications (chat, live dashboards) using Nest’s WebSocket gateways. 0 Reply The Geek The Geek Over a year ago Jan 24, 2023 · To use the provider class methods from another module in the current module controller, First, you have to export the provider class that needs to be used in other modules by adding the provider class in the exports array and the providers array of the @Module decorator function in its module definition file. Why? Because in NestJS, "service" is a synonym for dependency (it is a kind of provider). The solution I came up with is to make an HttpService POST Request to the NestJS Server How to inject a nestjs service into another service when both belong to the same module? I have the following scenario in NestJS: However, when I try to use the UserService inside a controller from another module, I get the following error: Controller code: Controller module: Main app. Regarding the second option: // regular typescript class // exported so you can type your injected "configService" in other classes export class ConfigService { // your code } Nov 30, 2021 · You don't need to add JwtService to the providers. Therefore, the assumption that dependencies should share some parts of their implementation seems unnecessary. A controller's purpose is to handle specific requests for the application. I want to use the ItemsService in the Both services are working alone in their module. Hint You can also use any general purpose Node. I have Nov 23, 2023 · I have a NestJS application consisting of modules, each with its own services, controllers, and entities. The dependencies will differ (because they do different things; they provide different functionalities!), so they are not alike. Update: tsconfig. Feel free to reach out if you need further help with debugging or NestJS module setup! 🚀 Thank you for being a Controllers Controllers are responsible for handling incoming requests and sending responses back to the client. This is working - helloWorldsService. If you want to access service within the same module, make sure you inject service in your constructor like constructor( private readonly eventStoreStateService: EventStoreStateService){} If you want to access service from another module then you have to export the service in . Think of the main module as the starting point import { Module } from '@nestjs/common'; import { CatsController } from '. forFeature([UserRepository,LocationRepository])], // or just Location entity [UserRepository,Location] if you didn't setup a custom LocationRepository After that, inject it in your as what you did for userRepo service constructor May 21, 2024 · In NestJS, the ConfigModule is a powerful utility module provided by the framework to facilitate configuration management in an application. json has "strict":true. ts Jan 22, 2019 · You have to use registerAsync, so you can inject your ConfigService. content_copy app. Nest will look through the current module's providers, then the imported module's exports, and then the global module's exports to find providers that are not immediately in the level it's resolving the providers in. Jul 9, 2023 · for NestJS v8, v9, v10, v11 What? Let's say you want to use multiple "versions" of the same NestJS provider that is created by a 3rd-party lib that you don't control. How does dependency injection work in NestJS? Nov 4, 2021 · ConfigService from @nestjs/config exists to integrate dotenv + joi with Nestjs. Feature modules In our example, the CatsController and CatsService are closely related and serve the same application Apr 14, 2021 · TypeORM repository classes do not adhere to Nest's Dependency Injection System, due to being tied TypeORM. Aug 13, 2018 · I've got a PlayersModule and an ItemsModule. Make your config service available as a node. ts @Module({ controllers: [PaymentController], }) export class PaymentModule {} And in the next service I want to have access to a service based on an inte Module reference Nest provides the ModuleRef class to navigate the internal list of providers and obtain a reference to any provider using its injection token as a lookup key. // ApiModule import {Module,Global} from '@nestjs/common'; import {KeyService} from '. asProvider () method of the configuration object. The ModuleRef class also provides a way to dynamically instantiate both static and scoped providers. For example: I have my loggingModule import { Module } fr Mar 30, 2023 · The benefit of using a shared module in NestJS is that it allows you to organize and reuse code across multiple modules in your application. Event-driven systems connecting to message brokers. It uses progressive JavaScript, is built with TypeScript and combines elements of OOP (Object Oriented Programming), FP (Functional Programming), and FRP (Functional Reactive Programming). The following Jan 20, 2023 · Exporting imported NestJS modules to children It is perfectly possible to export an imported module in NestJS. https://medium. bitsrc. Jan 18, 2021 · I assume this question is related to your last question, the simplest way to implement it, Add Location entity to your UserModule @Module({ imports:[TypeOrmModule. getString('SECRET_KEY'), signOptions May 29, 2021 · If it is a different service, ensure that you are using the correct provider token, it is in the current modules scope and instantiated. ts exports: [EventStoreStateService] and then also inject in service or Apr 24, 2019 · If you import BaseService on multiple modules, then the services inside of it will be instatiated multiple times. This means that for AuthService it'll look up to the JwtModule 's exports and find the JwtService already created, and use that Oct 18, 2018 · To inject service in guard. Follow clear steps and avoid pitfalls like missing exports or circular Feb 15, 2022 · I often read the question of how to inject a service/provider from another module. An import with a matching SCA binding is created in the second module. controller'; import { CatsService } from '. NestJs using a service from another Module in a Custom Repository Asked 5 years ago Modified 3 years, 7 months ago Viewed 2k times Jun 1, 2024 · How do I create a module in NestJS? You can create a module using the NestJS CLI with the command `nest generate module <module-name>`. The routing mechanism determines which controller will handle each request. The library also transforms the resulting HTTP responses into Observables. Then you can access the service through the constructor. Please make sure that the argument ClientRepository at index [0 Jun 18, 2025 · Learn how to use services and providers in NestJS to write scalable, maintainable backend code with dependency injection and clean architecture. First way: In your module file: @Module({ imports: [TypeOrmModule. providers: [ Hello people, I've been am trying to use a service from another module to load env variables from an external service in my configModule. I want to import that module and use it's service to fetch the secrets, and store them as env variables, as one would do with the load option of Feb 19, 2024 · In this blog post, we’ve embarked on a journey through Module & Dependency Injection (DI) in Nest. ModuleRef can be injected into a class in the normal way: content_copy cats. Indeed every module have the same services, but it is not quite true for the module have the same instance of services with the other modules. js module involves a few steps to ensure proper dependency injection and module organization. If you need logic from other services, you should generally be calling those other services from inside the service call, not Mar 7, 2022 · I'm new in Nestjs, and I don't understand when I need to import the whole module or only the service if I want to Inject in another module. My Scenario ` src/ │ ├── user/ Sep 16, 2019 · John is a member of the NestJS core team So you've noticed the cool ways in which you can dynamically configure some of the out-of-the-box NestJS modules like @nestjs/jwt, @nestjs/passport and @nestjs/typeorm, and want to know how to do that in your own modules? This is the right article for you! 😃 Intro Over on the NestJS documentation site, we recently added a new chapter on dynamic May 22, 2020 · I have a service which I can inject into other components without any issues. Jan 17, 2019 · I have a REST API, I want to send event to the client via websocket. I get the nest error: Error: Nest can't resolve dependencies of the Dec 23, 2019 · I have the next module: payment. https://blog. module. ts and add the following code to integrate the HttpService into a module: import { DynamicModule, Module, Provider } from '@nestjs/common'; Dec 14, 2020 · How to use a common service for multiple modules? I have service @Injectable() export class TestService { test(): number { return 123; } } I registered it in App module. Learn how to export a service (e. I want to use the ItemsService in the PlayersService. Mar 31, 2022 · Okay we have a use-case of creating External HTTP client as a nestjs dynamic Module, This Module will act as a http service using which we can make api calls same as axios or httpClient This is just for Demo and based on this we can create other nestjs dynamic Modules which can be plugged anywhere in any project May 26, 2024 · Why Use Dependency Injection in NestJS? Separation of Concerns: DI separates the creation of a class’s dependencies from its behavior, leading to cleaner and more maintainable code. To inject a NestJS service f Provider registration Now that we've defined a provider (CatsService) and a consumer (CatsController), we need to register the service with Nest so that it can handle the injection. In the same module i have another service/provider, let's say it's call ServiceA2, marked as @Injectable (). Microservices architectures, where each service is a self-contained NestJS app. By the way, I uploaded the whole project on Github. Learn about handling dependency errors and modular imports for seamles Jun 7, 2018 · I don't see really the need for a Dynamic Module here. In NestJS, dependency injection is used to provide instances of Dec 23, 2020 · I'm trying to use a service from a services module in the main scaffolded app controller in NestJS. ts class MockRequest impl Jul 30, 2018 · Would be cool if it did but unfortunately nestjs doesn't offer the ability for a module to 'depend on' another module currently. , UsersService), import its module into another (like AuthModule), and inject it seamlessly for modular, scalable applications. I want to inject ServiceA1 in ServiceA2 I try with: Mar 30, 2023 · The AuthModule module registers the AuthService provider in the providers array, indicating that it can be injected into other application components that depend on that service. message displays the expected greeting in the @Get method - Dec 5, 2021 · Key things to know in NestJs. Dependency injection in NestJS Dependency injection is a design pattern that allows objects to be created and managed within an application environment. Jul 31, 2024 · In my Nest. You forgot to use @InjectRepository for custom repositories. js setup have a mod. g. mtbr 8ed2v kepv dtqyugn qwb gmcb 83d ze96bw th ljt

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