Enabling debug logs

debug is a popular library, used by many notable frameworks, including the Express.js and Koa.js web frameworks and the Mocha test framework. debug is a small JavaScript debugging utility based on the debugging technique used in Node.js core.

In the recipe, we'll discover how to enable debug logs on an Express.js application.

Getting ready

1. Let's create an Express.js web application that we can enable debug logs on. We'll first need to create a new directory and initialize our project:

   $ mkdir express-debug-app
   $ cd express-debug-app
   $ npm init --yes
   $ npm install express

2. Now, we'll create a single file named server.js:

   $ touch server.js

3. Add the following code to server.js:

   const express = require("express");
   const app = express();
   app.get("/", (req, res) => res.send("Hello World!"));
   app.listen(3000, () => {
     console.log("Server listening on port 3000");
   });

Now...