NestJS Configuration

npm i @nestjs/config joi

PORT=3000
MONGO_URI=mongodb://localhost:27017/nestapp
JWT_SECRET=my_secret
NODE_ENV=development

import { Module } from "@nestjs/common";
import { ConfigModule } from "@nestjs/config";

@Module({
  imports: [
    ConfigModule.forRoot({
      isGlobal: true, // সব module-এ accessible
      envFilePath: [".env.development", ".env"],
    }),
  ],
})
export class AppModule {}

import { Injectable } from "@nestjs/common";
import { ConfigService } from "@nestjs/config";

@Injectable()
export class DatabaseService {
  constructor(private configService: ConfigService) {}

  getConfig() {
    return {
      port: this.configService.get<number>("PORT", 3000), // default
      dbUrl: this.configService.get<string>("MONGO_URI"),
      env: this.configService.get("NODE_ENV"),
    };
  }
}

export interface AppConfig {
  port: number;
  database: { uri: string };
  jwt: { secret: string; expiresIn: number };
}

export default (): AppConfig => ({
  port: parseInt(process.env.PORT ?? "3000", 10),
  database: {
    uri: process.env.MONGO_URI ?? "mongodb://localhost:27017/nestapp",
  },
  jwt: {
    secret: process.env.JWT_SECRET ?? "",
    expiresIn: parseInt(process.env.JWT_EXPIRES ?? "3600", 10),
  },
});

ConfigModule.forRoot({
  load: [configuration], // typed config
  isGlobal: true,
})

import * as Joi from "joi";

ConfigModule.forRoot({
  validationSchema: Joi.object({
    PORT: Joi.number().default(3000),
    MONGO_URI: Joi.string().required(),
    JWT_SECRET: Joi.string().required(),
    NODE_ENV: Joi.string()
      .valid("development", "production", "test")
      .default("development"),
  }),
  validationOptions: {
    allowUnknown: true, // অন্য keys বাদ যাবে না
    abortEarly: false,
  },
})