app.js

"use strict";
var debug = require("debug")("my express app");
var express = require("express");
var path = require("path");
var logger = require("morgan");
var cookieParser = require("cookie-parser");

var url = require("./routes/url");
var redirect = require("./routes/redirect");

var app = express();

// Database config
const connection = require("./config/db.config");
connection.once("open", () => console.log("DB Connected"));
connection.on("error", () => console.log("Error"));

// view engine setup
app.set("views", path.join(__dirname, "views"));
app.set("view engine", "pug");

// uncomment after placing your favicon in /public
//app.use(favicon(__dirname + '/public/favicon.ico'));
app.use(logger("dev"));
app.use(express.json());
app.use(express.urlencoded());
app.use(cookieParser());
app.use(express.static(path.join(__dirname, "public")));
app.use(function (req, res, next) {
    res.header('Access-Control-Allow-Origin', '*');
    res.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE');
    res.header('Access-Control-Allow-Headers', 'Content-type,Accept,x-access-token,X-Key');
    if (req.method == 'OPTIONS') {
        res.status(200).end();
    } else {
        next();
    }
});

app.use("/", redirect);
app.use("/api/url", url);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
    const err = new Error("Not Found");
    err.status = 404;
    next(err);
});

// error handlers

// development error handler
// will print stacktrace
if (app.get("env") === "development") {
    app.use(function(err, req, res, next) {
        res.status(err.status || 500);
        res.render("error",
            {
                message: err.message,
                error: err
            });
    });
}

// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
    res.status(err.status || 500);
    res.render("error",
        {
            message: err.message,
            error: {}
        });
});

app.set("port", process.env.PORT || 1337);

var server = app.listen(app.get("port"),
    function() {
        debug(`Express server listening on port ${server.address().port}`);
    });