# Logging — NestJS: Building Scalable Node.js APIs

Source: https://www.skillbyai.com/en/nestjs/nestjs-logging

> Log at the right levels with Nest's built-in Logger and plug in Winston or Pino for production logging.

## Built-in Logger

Inject `Logger` to log at different levels: debug, log, warn, error.

```typescript
import { Logger, Injectable } from '@nestjs/common';

@Injectable()
export class UsersService {
  private readonly logger = new Logger(UsersService.name);

  create(user: User) {
    this.logger.log(`Creating user: ${user.email}`);
    return this.userRepository.save(user);
  }
}
```

## Third-party loggers

Winston, Pino, or Bunyan—configure them in your main.ts or as a custom provider.

Quick check

**Quiz:** Why create `new Logger(UsersService.name)`?

- [x] It adds the class name as the log context
- [ ] It disables console output
- [ ] It writes logs to a file

*Answer:* It adds the class name as the log context. The context label shows which class emitted each line.