Dockerfile

FROM node:13-alpine AS base
RUN mkdir -p /var/app && chown -R node /var/app
WORKDIR /var/app
COPY package.json .
COPY package-lock.json .
COPY index.mjs .

ENV NODE_ENV=production
RUN apk add --update bash
RUN npm ci --only=prod --silent
EXPOSE 3000
CMD node --experimental-modules index.mjs

index.mjs

import fastify from 'fastify';

const server = fastify({ logger: true });
const PORT = 3000;

server.get('/', async (request, reply) => {
  reply.code(200).header('Content-Type', 'application/json; charset=utf-8').send({"hello":"world"});
});

server.post('/', async (request, reply) => {
  server.log.error(request);
  reply.code(200);
});

const start = async () => {
  try {
    await server.listen(PORT);
  } catch (error) {
    server.log.error(error);
    process.exit(1);
  }
}

start();