Scalable REST API with NestJS, PostgreSQL & Prisma

I will build a scalable REST API that gives your application a secure and maintainable backend foundation. This project is suitable for a web app, mobile app, SaaS product, admin panel, marketplace, or any application that depends on structured data and secure user access.

The main problem this project solves is backend complexity. Many projects start with simple routes, but later become hard to manage because authentication, database relations, validation, error responses, and documentation are not planned properly. I will create the backend with NestJS, PostgreSQL, Prisma ORM, TypeScript, JWT, Swagger, and Docker so your project starts with professional structure.

The API will include a complete authentication module with register, login, JWT access tokens, refresh tokens, and logout. This helps users sign in securely and keeps private endpoints protected. The refresh token flow makes the system practical when users need a stable session.

I will create two main resources for your application. Resource #1 will include full CRUD endpoints for listing, viewing, creating, updating, and deleting records. Resource #2 will also include full CRUD endpoints and will be connected to Resource #1 through database relations. This makes the backend useful for models such as categories and products, clients and projects, courses and lessons, users and posts, or any related data structure.

Validation and error handling will be added using class-validator and a global exception filter. This helps stop invalid input before it reaches the database and returns cleaner responses when something goes wrong. It also makes the API easier to use from frontend, mobile, or third-party systems.

Swagger documentation will be available at /api, with all routes documented clearly. This helps developers understand endpoints, request bodies, parameters, authentication needs, and response structure without guessing.

The database will be set up with PostgreSQL and Prisma schema, including migrations and a seed script. Prisma will keep the database layer organized.

1. Auth Module — Register, Login, JWT access + refresh tokens, logout
2. Resource #1 — Full CRUD endpoints (list, get, create, update, delete)
3. Resource #2 — Full CRUD endpoints with relations to Resource #1
4. Validation & Error Handling — class-validator, global exception filter
5. Swagger Docs — Auto-generated API docs at /api, all routes documented
6. DB Setup — PostgreSQL + Prisma schema, migrations, seed script