NestJS · Middle · Question 49 of 75

How do you validate environment variables at startup with `@nestjs/config`?

✓Correct answer: Pass a validationSchema (Joi) or a validate function (e.g. with class-validator or Zod) to ConfigModule.forRoot()
2Check them in every service
3Nest validates them automatically

Explanation

Failing fast at startup is better than crashing on the first request that needs a missing variable.

Further reading

NestJS: Configuration ↗

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