Gasket API Fastify Template

A high-performance TypeScript API template built with Gasket and Fastify.

Overview

This template provides a minimal, well-structured starting point for building RESTful APIs using:

• Fastify - Fast and low overhead web framework for Node.js
• TypeScript - Type-safe development with modern JavaScript features
• Gasket - Plugin architecture for extensible applications
• Swagger/OpenAPI - Automatic API documentation generation
• Winston - Production-grade logging
• Vitest - Lightning-fast unit testing

Features

• ✅ TypeScript configuration with ES modules support
• ✅ Fastify server with high-performance request handling
• ✅ Swagger documentation auto-generated from JSDoc comments
• ✅ Structured logging with Winston
• ✅ Testing setup with Vitest and coverage reporting
• ✅ Development server with hot reloading via tsx
• ✅ Build pipeline for production deployment
• ✅ ESLint configuration with GoDaddy style guide

Quick Start

Create a new API project using this template:

npx create-gasket-app@latest my-api --template @gasket/template-api-fastify

Project Structure

my-api/
├── gasket.ts              # Gasket configuration
├── server.ts              # Server entry point
├── plugins/               # Custom Gasket plugins
│   └── routes-plugin.ts   # API route definitions
├── swagger.json           # OpenAPI schema (generated)
├── test/                  # Test files
├── tsconfig.json          # TypeScript configuration
└── dist/                  # Built JavaScript (after npm run build)

Available Scripts

Script	Description
npm run local	Start development server with hot reload
npm run build	Build TypeScript to JavaScript
npm run start	Start production server from built files
npm run test	Run unit tests
npm run test:watch	Run tests in watch mode
npm run test:coverage	Run tests with coverage report
npm run docs	Generate and serve API documentation
npm run lint	Check code style and quality

API Routes

The template includes a sample route to get you started:

GET /default

Returns a welcome message.

Response:

{
  "message": "Welcome to your default route..."
}

Adding New Routes

Define routes in plugins/routes-plugin.ts using the fastify lifecycle:

export default {
  name: 'routes-plugin',
  hooks: {
    fastify(gasket, app) {
      /**
       * @swagger
       * /users:
       *   get:
       *     summary: Get all users
       *     responses:
       *       200:
       *         description: List of users
       */
      app.get('/users', async (req, res) => {
        res.send({ users: [] });
      });
    }
  }
};

Configuration

The template includes these Gasket plugins by default:

• @gasket/plugin-fastify - Fastify server integration
• @gasket/plugin-https - HTTPS and server lifecycle management
• @gasket/plugin-swagger - OpenAPI documentation generation
• @gasket/plugin-winston - Structured logging
• @gasket/plugin-command - CLI command support

Additional plugins can be loaded dynamically via the commands configuration in gasket.ts.

Why Fastify?

Fastify offers several advantages over Express:

• Performance - Up to 30,000 requests per second, nearly twice as fast as Express
• Type Safety - Built with TypeScript in mind with excellent type definitions
• Schema Validation - Built-in JSON schema validation for requests and responses
• Plugin Architecture - Encapsulated plugin system with dependency management
• Modern Features - Async/await support, HTTP/2, and built-in logging

Documentation

Run npm run docs to generate interactive API documentation using Swagger UI. The docs are automatically generated from JSDoc comments in your route handlers.

Testing

The template includes Vitest for testing. Write tests in the test/ directory:

import { describe, it, expect } from 'vitest';

describe('API Routes', () => {
  it('should return welcome message', () => {
    // Your test code here
  });
});

Next Steps

• Add your API routes in plugins/routes-plugin.ts
• Configure database connections and models
• Set up authentication and authorization
• Add input validation using Fastify's schema validation
• Configure environment-specific settings
• Set up CI/CD pipeline