The authService is facing dependency resolution issues with the jwtService, causing a roadblock in the application's functionality

I'm puzzled by the error message I received: [Nest] 1276 - 25/04/2024 19:39:31 ERROR [ExceptionHandler] Nest can't resolve dependencies of the AuthService (?, JwtService). Please make sure that the argument UsersService at index [0] is available in the AuthModule context.

Here are some potential solutions:

  • Check if AuthModule is a valid NestJS module
  • If UsersService is a provider, ensure it is part of the current AuthModule
  • If UsersService is exported from a separate @Module, make sure that module is imported within AuthModule

It's perplexing because the same code runs fine in another project. Here is a snippet of my file:

authModule:

(AuthModule content here)

appModule:

(AppModule content here)

UserModule:

(UserModule content here)

AuthService:

(AuthService content here)

I'm struggling to understand why Nest is having trouble resolving the jwtService dependency.

javascripttypescriptnestjsbackend

Answer №1

To ensure the correct functionality in your code, make sure to update the import statement in the auth.service file from Users.service to users.service. Remember that the casing of the file names is crucial as they are considered distinct files and have their own instances due to the nature of JS realms.

From (incorrect)

import { Injectable, HttpException, HttpStatus } from '@nestjs/common';
import { JwtService } from '@nestjs/jwt';
import * as bcrypt from 'bcrypt';
import { UsersService } from 'src/modules/users/Users.service';
import { User } from 'src/shared/schema/user';

To (correct)

import { Injectable, HttpException, HttpStatus } from '@nestjs/common';
import { JwtService } from '@nestjs/jwt';
import * as bcrypt from 'bcrypt';
import { UsersService } from 'src/modules/users/users.service';
import { User } from 'src/shared/schema/user';

This small adjustment can impact the functioning of your code significantly. Consider enabling the option in the Typescript compiler config to enforce consistent file casing for better development practices.

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