Configuration & Environment Management
ConfigModule, environment variables, .env, secrets, multi-env (dev/staging/prod), feature flags
1What is the ConfigModule in NestJS?
What is the ConfigModule in NestJS?
回答
ConfigModule is an official NestJS module that centralizes application configuration management. It allows loading environment variables from .env files, validating them with schemas, and injecting them into services via ConfigService. Unlike direct access to process.env, it provides strong typing and facilitates unit testing.
2How to import ConfigModule in a NestJS application?
How to import ConfigModule in a NestJS application?
回答
ConfigModule is imported with ConfigModule.forRoot() in the root module (AppModule). This method automatically loads the .env file from the project root and makes ConfigService globally available. It's also possible to pass options like envFilePath to specify a custom path or isGlobal to avoid reimporting the module.
3What is the role of the .env file in a Node.js application?
What is the role of the .env file in a Node.js application?
回答
The .env file stores environment-specific variables for each environment (development, staging, production). It contains values like database URLs, API keys, and secrets. This file should never be committed to Git (added to .gitignore) to avoid exposing sensitive information. It's loaded at startup via libraries like dotenv.
How to access an environment variable with ConfigService?
Which library does NestJS use to load .env files?
+17 面接問題