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Learn how to manage environment variables in NestJS properly — from basic setup to validation, typed config, and multiple environments — so your app never breaks because of a missing secret.
Learn how to handle errors properly in NestJS using exception filters, custom exceptions, and a global error response format that makes your API actually usable.
Learn how to connect NestJS to PostgreSQL using TypeORM — from installation to entities, relations, and repositories. With real code and the mistakes you'll actually make.
synchronize: true will eventually destroy your production database. Here's how to set up TypeORM migrations in NestJS the right way, with real commands and a workflow that actually makes sense.
Guards and middleware look similar in NestJS but they solve very different problems. Here's how to tell them apart and know exactly when to reach for each one.
Learn how to implement JWT authentication in NestJS from scratch — registration, login, protected routes, and Guards — with real working code every step of the way.