An example micro service using 'micro' that installs an actual development cert to avoid browser SSL errors

index.js

const https = require('https')
const { run, send } = require('micro')
const getDevelopmentCertificate = require('devcert-san').default;

async function startServer() {

  const PORT = process.env.PORT || 3443;
  let ssl;
  if (!process.env.NODE_ENV || process.env.NODE_ENV === 'development') {
    try {
      ssl = await getDevelopmentCertificate('my-micro-service');
    } catch (e) {
      console.error(e);
    }
  } else {
    //ssl = // load production ssl ...
    console.log('TODO: prod ssl config');
  }

  const microHttps = fn => https.createServer(ssl, (req, res) => run(req, res, fn))

  const server = microHttps(async (req, res) => {
    send(res, 200, { encrypted: req.client.encrypted });
  });
  server.listen(PORT);
  console.log(`\nListening on https://localhost:${PORT}`);
}

startServer().catch(e => console.error(e));

installCert.js

const getDevelopmentCertificate = require('devcert-san').default;

function installCert() {
  console.log('If you experience errors, please ensure you\'ve installed the prequisites:');
  console.log('  - Mac: brew install nss');
  console.log('  - Linux: apt install libnss3-tools');
  console.log('  - Windows: N/A');
  console.log('');
  console.log('NOTE: You may be prompted for your password during initial install.');

  getDevelopmentCertificate('my-micro-service', { installCertutil: true }).then(() =>{
    console.log('\nSSL cert was installed successfully or already existed.');
  }).catch(e => {
    console.error('\nError installing cert', e);
  });
}

installCert();

package.json

{
  "name": "my-micro-service",
  "version": "1.0.0",
  "description": "An example micro service using 'micro' that installs an actual development cert",
  "main": "index.js",
  "scripts": {
    "start": "micro",
    "dev": "nodemon ./index.js",
    "install-ssl": "node ./installCert.js",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "MIT",
  "dependencies": {
    "micro": "^7.3.3"
  },
  "devDependencies": {
    "devcert-san": "^0.3.3",
    "nodemon": "^1.11.0"
  }
}