yarn add micro micro-api

// index.js
const microApi = require('micro-api')
const handlers = require('./handlers')

const api = microApi([
  {
    method: 'post',
    path: '/foos',
    handler: handlers.createFoo,
  },
  {
    method: 'get',
    path: '/foos/:fooId',
    handler: handlers.showFoo,
  },
])

module.exports = api

// handlers.js
const uuid = require('uuid')

// In memory database
const foos = []

const createFoo = ({ body }) => {
  // Build up the new item
  const newFoo = { ...body, id: uuid() }
  // Add it to the database
  foos.push(newFoo)
  return newFoo
}

// Find and return by id
const showFoo = ({ params: { fooId } }) => foos.find(f => f.id === fooId)

module.exports = { createFoo, showFoo }