Typed ConfigService in NestJS

Preview

• Strongly Typed argument(property path) for Nested Configuration Object

• Dynamic return type according to config variables

Introduction

In NestJS, ConfigModule with ConfigService helps store and load configuration variables in .env file for convenience instead of using process.env.

Using the standard constructor injection, loading the variables with ConfigService would be like:

// config/configuration.ts
export default () => ({
    port: parseInt(process.env.PORT, 10) || 3000,
    database: {
      host: process.env.DATABASE_HOST || 'localhost',
      port: parseInt(process.env.DATABASE_PORT, 10) || 5432
    }
});

// app.module.ts
@Module({
  imports: [ …

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