scenario1-json.js

const SIZE = 500000;
const Fastify = require('fastify');
const axios = require('axios');

const fastify = Fastify({
  logger: true,
  bodyLimit: 1024857600,
});

fastify.post('/', (request, reply) => {
  console.timeEnd('JSON:Transmission');

  reply.send({ done: true });
});

fastify.listen(3000, async () => {
  const body = JSON.stringify({
    data: Array.from(Array(SIZE)).map((n, index) => ({
      index,
    })),
  });

  console.time('JSON:Transmission');

  axios({
    method: 'post',
    url: 'http://127.0.0.1:3000',
    data: body,
    responseType: 'json',
    headers: {
      'Content-Type': 'application/json',
    },
    maxBodyLength: Infinity,
  }).then(({ data }) => {
    console.time('JSON:Serialize');
    console.log(`JSON:Size:${Buffer.from(JSON.stringify({
      data: Array.from(Array(SIZE)).map((n, index) => ({
        index,
      })),
    }), { encoding: 'utf8' }).length}`);
    console.timeEnd('JSON:Serialize');
  });
});