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res.setHeader('Access-Control-Allow-Origin', '*');
res.setHeader('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content, Accept, Content-Type, Authorization');
res.setHeader('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE, PATCH, OPTIONS');

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const normalizePort = val => {
  const port = parseInt(val, 10);

  if (isNaN(port)) {
    return val;
  }
  if (port >= 0) {
    return port;
  }
  return false;

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MySQL

Getting started:

• http://www.sqlteaching.com/
• https://www.codecademy.com/courses/learn-sql

Related tutorials:

• MySQL-CLI
• Analyzing Business Metrics

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module.exports = fn => {
  return (req, res, next) => {
    Promise.resolve(fn(req, res)).catch(next);
  }
};

// EXAMPLE OF USAGE:
//const catchException = require('./utils/catchException')
//app.get('/', catchExceptions(async (req, res) => {
//    ...

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app.disable("x-powered-by");

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### Example #1 ###
$ docker ps -a
CONTAINER ID        IMAGE               COMMAND               CREATED             STATUS                   PORTS                               NAMES
2e23d01384ac        iperf-v1:latest     "/usr/bin/iperf -s"   10 minutes ago      Up 10 minutes            5001/tcp, 0.0.0.0:32768->5201/tcp   compassionate_goodall
# Append the container ID (CID) to the end of an inspect
$ docker inspect --format '{{ .NetworkSettings.IPAddress }}' 2e23d01384ac
172.17.0.1

### Example #2 ###
# Add -q to automatically parse and return the last CID created.

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Kill-port:
//To list any process listening to the port 8080:
sudo lsof -i:8080
//To kill any process listening to the port 8080:
sudo kill $(lsof -t -i:8080)
//or more violently:
sudo  kill -9 $(lsof -t -i:8080)
//(-9 corresponds to the SIGKILL - terminate immediately/hard kill)

On freeze: 

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module.exports = ms => {
  return new Promise((resolve, reject) => {
      setTimeout(resolve, ms);
  })
}

//EXAMPLE OF USAGE:
//const promuseTimeout = request('./utils/promiseTimeout');
//(async () => {
//  await promiseTimeout(1000);

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Weeklies

• NodeJS Weekly http://nodeweekly.com/
• Mobile Web Weekly http://mobilewebweekly.co/
• Bitcoin Weekly http://bitcoinweekly.com/
• Cloud Development Weekly http://clouddevweekly.co/
• HTML5 Weekly http://html5weekly.com/
• Javascript Weekly http://javascriptweekly.com/
• Database Weekly http://dbweekly.com/
• Web Operations Weekly http://webopsweekly.com/

maxsimych

Favorite Packages list

• Rate limiter - limiter
• JSON logger - bunyan
• VK API - easyvk
• Stream uploader - multer
• Password hashing - bcrypr
• Auth middleware - passport
• CORS middleware - CORS