Nestjs middleware dependency injection stack overflow

Nestjs middleware dependency injection stack overflow. The others are Nest specific concepts and as such tie in a bit more naturally with things like Dependency Injection. This is great, because you do not need to care about the transitive dependencies that the class you want to inject requires. One option would be to write whatever query myService. I know this is not an explination of Dependecy Injection buti faced same issue, using scenario 1 Add your user. how to load the express app in dependency injection and express app pass the parameter in dependency constructor. The code you posted works because there are no injected dependencies. I have Nest JS application with typescript. Check out this link in the documentation and this answer on Stackoverflow. constructor (authService) {. For example, suppose we want to inject the AuthService provider into a controller that handles user authentication. Dec 21, 2022 · 0. To learn more, see our tips on writing great Jun 23, 2023 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Probably the easiest way is to drop the dependencies altogether and instead introduce a third module that depends on the other two. Jun 8, 2023 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Questions tagged [nestjs] Nest (NestJS) is a framework for building efficient, scalable Node. To learn more, see our tips on writing great Aug 29, 2023 · 3. I'm trying to authenticate and check permission of a user while establishing a websocket connection in a NestJS application. io/) in my NestJS project, and I need to inject services, for example for authenticating a client. Nov 23, 2021 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. forFeature ( [ { name: 'Student', schema: StudentSchema })]) to the imports array of the module that contains TestService (presumably TestModule) so that Nest can go and create the dynamic provider that you want to inject. You can perform the token validation in the options. providers: [configServiceProvider], exports: [configServiceProvider], }) export class ConfigModule {} When injecting ConfigService in your NestJS app, the value will be resolved to configService (as long as ConfigModule is in the scope, obviously). Mar 30, 2020 · With NestJS, you need to provide constructor arguments via providers. Apr 13, 2019 · I have two features modules where I actually process the uploaded files. Sep 1, 2021 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. To learn more, see our tips on writing great There is definitely some overlap as Middleware are a flexible way of composing any web application but are more of a generic concept (creating a stack of functions to build a pipeline). dependencya = dependencya; this. I want to inject authService into googleStrategy. How do I access my service function by accessing the external dependancy? Apr 7, 2020 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. To learn more, see our tips on writing great Sep 27, 2023 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. modules. Apr 25, 2021 · constructor(. keyCloack in its method. Nov 19, 2021 · My problem is that these services need to have a service dependency themselves, and I am not sure that how I have currently done it is the best way to do it in NestJS. I followed the Nestjs DOCS regarding pubsub/subsciprtions: According to the examples, pubsub is initialized at the top of a given resolver with: const pubSub = new PubSub(); later the docs say: "We used a local PubSub instance here. Aug 31, 2022 · NestJS dependency injection. Example: I want to use the UserService in my UserController. // main. Please provide enough code so others can better understand or reproduce the problem. To learn more, see our tips on writing great Aug 8, 2023 · Please note that because your function is being executed in a forked process, Dependency Injection (and IoC container) won't be available. Might be much simpler that inversify/tsyring reflect metadata. module on TypeOrmForFeature (). So I'm stuck with this. If at all possible you should inject dependencies in NestJS. To achieve this I created one middleware with scope request as below. Instead, we should define PubSub as a provider, inject it through the constructor (using @Inject () decorator Mar 7, 2019 · The actuator module is imported like this. Using a Custom Logger with Nest JS's Dependency Injection. We used to build transactions this way: import { getManager } from 'typeorm'; Dec 5, 2021 · 1. If I import MulterModule in my AppModule, the registered storage service is not working. I thought I can develop a Nestjs middleware to register the fastify plugins that I need. That means that your processor function will need to contain (or create) all instances of external dependencies it needs. I've implemented something inside of nest-commander for plugins, but make sure you understand how it works before just using it. The shared library contains a custom subscriber MinimalClass, which is imported to one my NestJS apps via the AppModule's imports. I am trying to figure out how to pass my jwt token for each database request to the prisma service iv created. To learn more, see our tips on writing great . To learn more, see our tips on writing great Jun 13, 2021 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. To learn more, see our tips on writing great Sep 25, 2008 · Like wise dependency injection is the process of externalizing the dependencies to focus only on the specific functionality of the component so that independent components can be coupled together to form a complex system. TLDR: services in nestjs are singletons, but ONLY regarding a module. Thanks for the answer. ts as I want to make use of the Nestjs dependency injection. To inject a service into an application component, you must use the @Inject() annotation. This will Dec 27, 2022 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Just regular instantiation with dependency injection. NestJS Dependency injection fails for imported modules. ts // => The main file of my Nest app, this one is working properly. A usecase class or a domain service will use the repository to get the domain entity, then you act on it and when you finish the same usecase/domain service will store the domain entity. To learn more, see our tips on writing great Dec 27, 2019 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. const userMock = [{ account: 'dung', password: '12345678' }]; export class UserService {. In your case, you could merge your two resolvers into a single StudentLessonResolver that lives in its own module, say ResolverModule: async assign({ lessonId, studentIds }: AssignStudentsToLessonInput) {. @Inject(forwardRef(() => ServiceA)) private readonly serviceA: ServiceA, ) {} It causes a circular dependency between the modules issue, but I can't track the root as module A is in another module, and the modules are deeply integrated/nested. To learn more, see our tips on writing great Mar 13, 2023 · There are no NestJs (Or Angular) specific guidelines or best practices for this, as far as I can tell. Share. I have a service that consumes messages from a queue and depending on type in the message I want to init a service. In my nest app, I try to read a route's decorator in a custom guard, using the getAllAndOverride function from Reflector (basically follwing documentation and best practice I hope). To learn more, see our tips on writing great Jan 8, 2021 · A public method named Invoke or InvokeAsync. This feels like unnecessary lifting, but it follows Nest JS's dependency injection, and allows for extending or overwriting later. To learn more, see our tips on writing great Jun 17, 2021 · 1. } } Finally, in order to the AuthService be available to the dependent controller, it has to be imported in the same Module that controller is provided. Jun 3, 2022 · NestJS - add dependencies as interface. I want to use the Colyseus Framework (https://colyseus. So you can add this before your middleware class definition. Iv tried an object to the constructor but then wont compile saying I am missing a dependency injection for whatever I reference in the constructor paramter. The goal is to use the datasource without the nestjs dependecy injection. NET Core middleware. Even if you try to export your service, the service cant export the entity that he needs (user. public getAllName(){. I don't know how circular dependencies are resolved in NestJS, or how to debug better. import { Module } from Dec 8, 2021 · Nest doesn't easily have this capability. Jul 5, 2022 · Even if Reflect. ConfigModule. High cohesion and loose coupling. createMicroservice<MicroserviceOptions>(AppModule, microserviceOptions); await app. As demonstrated from the Source code. Jan 14, 2024 · NestJS Reflector not injected in Custom Guard. Oct 14, 2020 · 28. REQUEST, durable: true, } Nest is a framework for building efficient, scalable Node. I inject 3 services in my controller: one is declared as provider inside the controller's module (AnswerModule), the 2 other services are declared in other modules (QuizesModule and QuestionsModule). There is a base class @Injectable () export class FakeBinanceClient implements ITradeClient { and a child class @Injectable () export class ScheduledFakeBinanceClient extends FakeBinanceClient { I do inject the child explicitely in another class by constructor Oct 7, 2020 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. @Module({. scope: Scope. It's also part of the SOLID programming principles which are widely adopted inside the industry. create(AppModule); app. @Injectable () is how you tell Nest this is a class that can have dependencies that should be instantiated by Nest and its DI system. Aug 5, 2020 · UserService is part of the dependency injection system. Applying middlewares. We cannot just import the user service and create a new instance of it ourselves. Jun 10, 2014 · I've a Nestjs app (a Rest API) that I would like to import in another node module, as a simple Express middleware (not a Nest middleware). To learn more, see our tips on writing great May 28, 2020 · 14. The way we add dependencies in NestJS is by using the @Injectable annotation: constructor(. – Valerio. Jun 7, 2018 · import { Dependencies } from '@nestjs/common'. Feb 15, 2023 · Also, you could receive such behavior if you do something like that: const app = await NestFactory. forRoot({ actuatorToken: ApplicationActuator })] The ApplicationActuator is the class knowing if the app is healthy or not. auth. To learn more, see our tips on writing great Jun 27, 2023 · 2 Answers. Oct 28, 2022 · To create the provider for @InjectModel ('Student') you need to add MongooseModule. Route1Service - Read a file of data, and return it. Jun 26, 2020 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Jul 9, 2022 · NestJs Inject Service Dependency in Sequelize Logging function. As a side note: If you follow the DDD/Clean architecture, you should not access the repository from the domain entity. This method must: Return a Task. I am pretty new to developing REST APIs using the NestJS framework (started using it last week). Oct 14, 2022 · Before, we were using Typeorm 0. – Jun 28, 2022 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. The same is true for a Guard. To learn more, see our tips on writing great Nov 28, 2023 · I'm struggling to achieve a dependency injection inside a class not instantiated by NestJS. js flow works that the lower module doesn't know the upper's imports or provide unless the upper module is global. But maybe something like that will work: #InfoModule providers: [ {provide: JWTService, useExisting: JWTService}] but I don't know if it will work and even so, this is a workaround. To learn more, see our tips on writing great Dec 8, 2018 · With this, you can choose one of the following three scopes for your providers: SINGLETON: Default behavior. This guard simply looks for an authorization header to extract the jwt. REQUEST: For each request, a new provider is created. Additional parameters for the constructor and Invoke/InvokeAsync are populated by dependency injection (DI). But when I inject service into passport strategy, injecting is not working. The thing is we cannot make use of dependency injection with a parameter decorator. entity). 2 and upgraded to 0. Jan 13, 2024 · NestJS 8 - Inject Service without constructor. You should consider using an Interceptor instead of a custom decorator as they run earlier in the Nest pipeline and support dependency injection by default. I import these modules in AnswerModule. Jay McDoniel. Sep 9, 2022 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. So far the only way I could think of is replacing each emit call by wrapping socket with a facade Dec 3, 2021 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Feb 4, 2023 · 1 Answer. The import tells Typescript and JavaScript that the PrismaClient will be used in the file. init(); Where app. Jun 5, 2023 · NestJS dependency injection and TransformPipe 1 Nestjs, met some problems when using dependency injected class's method in interceptors, inject can't be resolved Mar 31, 2021 · I am using nestjs, graphql, & prisma. Making statements based on opinion; back them up with references or personal experience. This question needs to be answered by looking at the idea of dependency injection as a pattern. dependencyb = dependencyb. Better to properly declare your file dependencies rather than relying on some global scope. While the NestJS app runs fine, its e2e tests fail due to dependency resolution issues related to this subscriber. use(yourMiddlewareMethod); await app. Nest uses classes usually to know what injection token to work with, as classes persist in both Typescript and JavaScript. I created this middleware: May 30, 2022 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Furthermore the user needs to be fetched via a service to get its Sep 23, 2022 · 1 Answer. Yes, by default providers are singleton in Nestjs, however, you can define the scope for your middleware using the options in the Injectable decorator. use. Mar 30, 2023 · In NestJS, dependency injection is used to provide instances of services to other application components. Actually I'm still not able to make it working. getColumn value does inside your migration. Nov 29, 2019 · 6. authService = authService. Shameless plug, you can try iti library. So, I need to apply the middleware in the AppModule. imports: [ActuatorModule. The UserService requires the UserModel for instantiation. – Jay McDoniel. The goal is pretty clear - to avoid calling emit with raw event name and any data. Maybe you could try service just like controller. Sure the guard's dependencies are resolved as providers within the calling module's scope but it itself is not. forRoot ( { ignoreEnvFile: true, isGlobal: true, load: [async () => await fetchConfig (new ServiceConfigurationService ())], }), Inside ServiceConfigurationService class I want to inject other service class which I have exposed through a npm module. I am running into issues getting the proper class injected with NestJS. Asking for help, clarification, or responding to other answers. Only when you declare the guard as a dependency. However, you can use the @Inject() decorator with your own injection token and custom value to ensure that Nest injects the value properly. Yes it's necessary. Sorted by: 0. Let the logic be handled at the service layer. If you're hell bent on using Nest's DI inside your migration then you could do something like this: import { NestFactory } from '@nestjs/core'; import { MigrationInterface, QueryRunner, Repository } from 'typeorm'; Apr 28, 2021 · 2. Instead of trying to conditionally instantiate a service class you could create a global middleware to redirect the request to the appropriate controller e. Accept a first parameter of type HttpContext. – Community Bot. Like controllers and providers, middleware can also inject dependencies that are in the same module. Just like in AppController, is it looked up in the provider scope. I've found this discussion which recommends to make use of NestJS Websocket adapter. May 6, 2020 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Recently I had to update this application to use multi tenancy where my main requirement is to connect different database based in tenanId (I know multiple database is not the suggested way but that is my requirement). 1st Method: If you want to use your middleware on every route you can use global middleware. You can only override providers. Dec 23, 2020 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. To learn more, see our tips on writing great Jan 21, 2019 · 6. getMetadata is in fact called by Reflector API of NestJS, it could be changed in the future. Dependency injection into controller works well so far. To emulate your desired behavior what you could do is to have 2 providers - each with it's own logic inside - and then inject one service or another inside Nov 23, 2018 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. May 17, 2021 · Dependency Injection promotes good code organization and testability which is why it is a popular design pattern across many different programming languages and frameworks. Thus, the example of YourModule I gave could have a constructor like constructor(@Inject(KEYCLOACK) private keyCloack: SomeType) {} and use this. import {. You can only pass the class reference to a consumer. for example: import { Injectable, Logger, NestMiddleware } from '@nestjs/common'; import { NextFunction, Request, Response } from 'express'; import * as requestIp from 'request-ip'; Aug 22, 2020 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Oct 16, 2023 · Please make sure that the argument dependency at index [0] is available in the AuthModule context. To learn more, see our tips on writing great May 24, 2023 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. To learn more, see our tips on writing great Dec 11, 2021 · I am have an issue with this package @ntegral/nestjs-sentry in nestjs. useValue: configService, }; // and use it in your ConfigModule. One instance of your provider is used for the whole application. It uses progressive JavaScript, is built with and fully supports TypeScript. g. To learn more, see our tips on writing great Jun 13, 2021 · I'm trying to make application using nestjs. Technically there are ways to just import once, but it's a pretty bad practice and not really followed anymore. However, because you want to both pass values (for cache timeout) as well as resolve dependencies you'll have to use the mixin pattern. To learn more, see our tips on writing great May 22, 2020 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. use(req: any, res: any, next: () => void) {. Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. – Aug 31, 2022 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. To learn more, see our tips on writing great Feb 24, 2018 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. @Dependencies(AuthService) export class DependentController {. We are using functions and not classes, therefore, without huge refactoring, we can't use datasource dependency injection. Dec 22, 2023 · Sorted by: 0. – Maciej Sikorski. To learn more, see our tips on writing great Apr 8, 2022 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. The code you have is valid, in that it will return the value 1 like the static method says to, but the static method cannot use any of the instance values that are injected. This is my module code. When I extend the custom guard from the Passport 'AuthGuard', the reflector object exists, but is not an instance of May 30, 2018 · See "Dependency Injection" in the NestJS documentation. Sorted by: 2. Provide details and share your research! But avoid Asking for help, clarification, or responding to other answers. Edit after receiving the repository. For Authorization purposes I want to implement a CanActivate Guard to my app. const app = await NestFactory. I have a custom logger I use in my application @Injectable() export class CustomLogger implements LoggerService { constructor(@ Dec 24, 2023 · I have an e2e test in a NestJS app where I would like to test a path which is protected by some authentication middleware. import { Injectable, NestMiddleware } from '@nestjs/common'; @Injectable() export class AdminUserMiddleware implements NestMiddleware {. apply () call in a NestModule 's configure method. I am trying to make some logs about my NestJs app, I had a simple interceptor which add the request and the response to the database (Logs Table contain id, request, response, queries) based on request unique identifier (UUID), the problem is: Sequelize logging, How can I Log the Jul 15, 2021 · I still want to believe there has to be a way to accomplish it like this, but maybe Nest JS's dependency system circumvents Jest's hoisted mocking? 🤷. In that way the ThingService will only ever have a single instance. 1. Dec 9, 2021 at 20:22. entity to auth. Sep 22, 2022 · I don't want to use the register method in main. Dec 25, 2020 · 1. To learn more, see our tips on writing great Stack Overflow Public questions & answers; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Talent Build your employer brand Advertising Reach developers & technologists worldwide; Labs The future of collective knowledge sharing; About the company Mar 11, 2020 · 2. import { Test, TestingModule } from '@nestjs/testing'; import { AppModule Nest. The service makes use of the users repository and that users repository is setup only through dependency injection. Is there a way to do this? UPDATE. So if you want a ThingService to be a single instance in all the app, you should create a module that instantiate said ThingService, and then exports it. SocketFacadeHost below is an example of such a service. The main benefits we achieved by using dependency injection. use (new SimpleLoggerMiddleware ()) should be fine. To learn more, see our tips on writing great Sep 1, 2021 · With UseGuards, the passed in class is not resolved as provider. This provider could have another dependencies internally (nested) The ActuatorModule uses a factory approach to provide the service locator (FactoryHelper) Oct 26, 2023 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. init () secondly call all NestJS initializing hooks. To learn more, see our tips on writing great Sep 25, 2018 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Nov 15, 2023 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. answered Jun 27, 2023 at 20:30. return this. Sep 8, 2021 · NestJS Dependency Injection in Websocket Adapter. For example for a message { "type": "A" } I want to use ServiceA, for a message { "type": "B" } I want to use ServiceB . this. The dependency injection system mainly handles the instantiation of the classes. @Injectable() private userService: UserService, @Injectable() private cacheService: CacheService, @Injectable() private emailService: EmailService, ) {} Do you know if there is a way to add dependencies like an Jan 22, 2021 · This is because the idea of dependency injection (at least to Nest) is to inject instances of the dependencies so that they can be leveraged later. Provide details and share your research! But avoid . To learn more, see our tips on writing great Jun 2, 2023 · I am working with an Nx monorepo, which includes several NestJS applications and a shared library. Mar 11, 2023 · Dependency injection. app. You need to pass the middleware class instance to app. It uses progressive JavaScript, is built with TypeScript and combines elements of OOP (Object Oriented Programming), FP (Functional Programming), and FRP (Functional Reactive Programming). Potential solutions: - Is AuthModule a valid NestJS module? - If dependency is a provider, is it part of the current AuthModule? - If dependency is exported from a separate @Module, is that module imported within AuthModule? Jul 14, 2021 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. allowRequest callback as below. If, instead, you had. Jul 14, 2022 · 1. Follow. listen(3000); NOTE: Though this would work for every route so the user won't be able to login. I want to inject @ConnectedSocket into a nestjs service that provides an interface for event emitting. So apparently I need to import MulterModule in all the feature modules, but in there, dependency injection is not working. js server-side applications. To learn more, see our tips on writing great Aug 29, 2021 · NestJS inject service in guard. Modules and Guards can inject providers too. To learn more, see our tips on writing great Nov 20, 2019 · this. dependencya. 3. TRANSIENT: A dedicated instance of your provider is created for every provider that injects it. Dec 3, 2023 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. So if we want to deal with only public/documented API of NestJS, we can: use a global guard, which will inject Injector, get metadata with ExecutionContext; and then set result in Request instance. ts Feb 3, 2021 · Encapsulation. Unfortunately guards can't be overriden as this comment in a nestjs issue states: You can't override enhancers (interceptors, guards, pipes, or filters). Reference Write custom ASP. fp br rr jt je oh ir xu gx py