Express midlewares hell

middlewares-anti-pattern.js

module.exports = (app) => {

  // where ther hell is this config set?
  const config = app.get('config');
  // How can i see what this timer do?
  const timer = app.get('timer');
  
  app.post((req, res, next) => {
    const data = {};
    // Which middleware set up this query params?
    if(req.query.ms) {
      data.when = timer.now();
    } else {
      data.when = new Date(timer.now()).toISOString();
    }
    // How this body was set, in which middleware?
    if(config.repeatBody) {
      data.body = req.body;
    }
    res.jsonBody = data; // Which consequences setting that jsonBody has?
    next(); // What happens then? New headers? Body transformations?
  })

};