Fastify starter

The code

Two files, exactly what you get in the editor.

import Fastify from 'fastify'

const app = Fastify({ logger: true })

app.get('/', async () => ({ hello: 'world', try: '/add?a=2&b=3' }))

app.get(
  '/add',
  {
    schema: {
      querystring: {
        type: 'object',
        required: ['a', 'b'],
        properties: { a: { type: 'number' }, b: { type: 'number' } },
      },
    },
  },
  async (request) => {
    const { a, b } = request.query as { a: number; b: number }
    return { a, b, sum: a + b }
  },
)

const port = Number(process.env.PORT) || 3000
await app.listen({ port, host: '0.0.0.0' })

{
  "name": "fastify-api",
  "private": true,
  "type": "module",
  "dependencies": {
    "fastify": "^5.6.0"
  }
}