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GENERAL PROJECT

TypeScript API Service

Planned

Node and TypeScript Backend Service
Typed REST service demonstrating backend architecture, validation, persistence, and HTTP workflows.

PLANNED PROJECT

TypeScript API Service

02

Purpose & Learning Objectives

Why this project exists and what the implementation should teach.

Purpose / Learning

Purpose

Build a real backend service in TypeScript so server architecture is learned independently from frontend frameworks.

Learning Objectives

  • Design REST resources and routes.
  • Separate route, controller, service, and repository responsibilities.
  • Validate request bodies and query parameters.
  • Use typed success and error responses.
  • Persist data through a replaceable data layer.
  • Implement filtering, sorting, pagination, and health endpoints.
  • Test service behavior without relying on manual browser checks.
03

Technology Plan

Current, planned, legacy, or candidate technologies for this project.

Runtime

Node.js
TypeScript

Protocol

HTTP
REST
JSON

Database Candidates

SQLite
PostgreSQL

Framework Candidates

Express
Fastify

Testing Candidates

Vitest
Playwright / API testing

04

Implementation Scope

Planned behaviors, architecture decisions, and evidence this project should produce.
Resource design
Define one coherent resource domain before writing routes.
Layered architecture
Keep HTTP concerns separate from business and persistence logic.
Validation and errors
Reject bad inputs consistently.
Data operations
Provide practical service behavior.
Testing and documentation
Make the service inspectable and repeatable.
05

Project Notes

Implementation context, boundaries, and later expansion.

Project Notes

Framework Decision

Express and Fastify remain candidates until the project begins; choose one deliberately.

Database Decision

SQLite is simplest locally; PostgreSQL becomes valuable when relational server deployment is part of the lesson.

07

Implementation Sketch

A compact structural example for this project.
Layer Sketch
A conceptual request path for the planned service.
Example
request
  -> route
  -> controller
  -> service
  -> repository
  -> database