expressjs-before-after-middleware-implement

expressjs-before-after-middleware-implement

const express = require('express');
const app = express();

const beforeAfterInjection = function(req, res, next) {
    res.response = function (obj) {
        req.res = obj;
    }
    next();
}

const beforeMiddleware = function(req, res, next) {
  console.log('Before middleware triggered');
  next();
}

const responseHandler = function(req, res, next) {
    console.log('Response Action implementation triggered with response instead of send');
    res.status(200).response({"response":"fine"});
}

const handler = function(req, res, next) {
    console.log('Response Action implementation is not passed to express. Rather handler is triggered');
    responseHandler(req, res, next);
    next();
};

const afterMiddleware = function(req, res, next) {
    console.log('After middleware triggered');
    next();
}

const finalResponseHandler = function(req, res, next) {
    console.log('Final immutable response handler triggered');
    res.send(req.res);
};

app.get('/implement', beforeAfterInjection, beforeMiddleware, handler, afterMiddleware, finalResponseHandler);

app.listen(9001, '127.0.0.1', function() {
    console.log('Server started at port ' + 'localhost' + ':' + 9001);
});