GENERAL PROJECT
TypeScript API Service
Node and TypeScript Backend Service
Typed REST service demonstrating backend architecture, validation, persistence, and HTTP workflows.
PLANNED PROJECT
Build a real backend service in TypeScript so server architecture is learned independently from frontend frameworks. The implementation is planned.
TypeScript API Service
Build a real backend service in TypeScript so server architecture is learned independently from frontend frameworks. The implementation is planned.Build a real backend service in TypeScript so server architecture is learned independently from frontend frameworks. The implementation is planned.
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.
Technology Plan
Current, planned, legacy, or candidate technologies for this project.Implementation Scope
Planned behaviors, architecture decisions, and evidence this project should produce.
Resource design
Define one coherent resource domain before writing routes.- Collection endpoint.
- Single-resource endpoint.
- Create/update/delete behavior.
- Status code rules.
Layered architecture
Keep HTTP concerns separate from business and persistence logic.- Routes.
- Controllers.
- Services.
- Repository/data layer.
Validation and errors
Reject bad inputs consistently.- Body validation.
- Query validation.
- Typed application errors.
- Central error formatting.
Data operations
Provide practical service behavior.- Filtering.
- Sorting.
- Pagination.
- Search where useful.
Testing and documentation
Make the service inspectable and repeatable.- Request examples.
- Automated tests.
- Health/status endpoint.
- README architecture notes.
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.
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