chillastic/config/express.js

const compression    = require('compression');
const bodyParser     = require('body-parser');
const methodOverride = require('method-override');
const cookieParser   = require('cookie-parser');
const errorHandler   = require('errorhandler');
const cors           = require('cors');
const expressLogger  = require('express-bunyan-logger');
const HttpStatus     = require('http-status');
const PrettyStream   = require('bunyan-prettystream');
const config         = require('./index');

const prettyStdOut = new PrettyStream({mode: 'dev'});
prettyStdOut.pipe(process.stdout);

const MAX_ACCEPTABLE_RESPONSE_TIME = 30000;

module.exports = function (app) {
  const env = app.get('env');

  app.use(compression());
  app.use((req, res, next) => {
    // fall back to json post bodies
    const contentType = req.get('content-type');
    if (!contentType || contentType === 'application/x-www-form-urlencoded') {
      req.headers['content-type'] = 'application/json';
    }
    next();
  });
  app.use(bodyParser.text());
  app.use(bodyParser.json());
  app.use(methodOverride());
  app.use(cookieParser());
  app.use(cors());
  app.use(expressLogger({
    name:    `${config.FRAMEWORK_NAME}-express`,
    format:  ':status-code - :method :url - response-time: :response-time',
    streams: [
      {
        level:  'info',
        stream: prettyStdOut
      }
    ],
    excludes: ['*'],
    levelFn:  (status, err, meta) => {
      if (meta['response-time'] > MAX_ACCEPTABLE_RESPONSE_TIME) {
        return 'fatal';
      } else if (meta['status-code'] >= HttpStatus.INTERNAL_SERVER_ERROR) {
        return 'error';
      } else if (meta['status-code'] >= HttpStatus.BAD_REQUEST) {
        return 'warn';
      } else {
        return 'debug';
      }
    }
  }));

  if ('development' === env || 'test' === env) {
    app.use(errorHandler()); // Error handler - has to be last
  }
};