On the way to continuous integrationĪnyone who actively lives in the information technology industry has encountered the term "continuous" many times. Due to the wide range of technologies and the need for having specialist knowledge, it's essential to choose the right tools for work. ![]() Among the prerequisites for working as a DevOps engineer are the skills in the field of software development and knowledge of its implementation processes. DevOps is undoubtedly one of the most popular terms in the IT world. With the following code, you can log application activities in both console and a desired log file:Ĭonst toobusy = require ( 'toobusy-js' ) const express = require ( 'express' ) const app = express () app. These modules enable streaming and querying logs, and they provide a way to handle uncaught exceptions. In Node.js, there are modules such as Winston, Bunyan, or Pino to perform application activity logging. In addition, these logs can be used to feed Intrusion Detection/Prevention Systems (IDS/IPS). It is also useful for security concerns, since it can be used during incident response. It makes it easier to debug any errors encountered during application runtime. Logging application activity is an encouraged good practice. You can use escape-html or node-esapi libraries to perform output escaping. ![]() In addition to input validation, you should escape all HTML and JavaScript content shown to users via application in order to prevent cross-site scripting (XSS) attacks. urlencoded ( (object where calling toString() will fail) The following code snippet is an example of "Callback Hell":Īpp. If the module you are using does not support Promises, you can convert base object to a Promise by using Promise.promisifyAll() function. In order to completely stay away from "Callback Hell", flat Promise chains should be used. It should be noted that Promise calls can also become a pyramid. As a principle, you can make all your asynchronous code (apart from emitters) return promises. This way Promises provide a higher assurance of capturing and handling errors. If an error occurs in a Promise class, it skips over the. then function.Īnother advantage of Promises is the way Promises handle errors. Promises provide top-down execution while being asynchronous by delivering errors and results to next. Promises are a good way to write asynchronous code without getting into nested pyramids. In such code, the errors and results get lost within the callback. This problem is referred to as a "Pyramid of Doom" or "Callback Hell". Any multistage process can become nested 10 or more levels deep. However, increasing layers of nesting within callback functions can become a problem. These are categorized as:Īpplication Security ¶ Use flat Promise chains ¶Īsynchronous callback functions are one of the strongest features of Node.js. There are several different recommendations to enhance security of your Node.js applications. This cheat sheet aims to provide a list of best practices to follow during development of Node.js applications. Node.js applications are prone to all kinds of web application vulnerabilities. ![]() ![]() Node.js applications are increasing in number and they are no different from other frameworks and programming languages. Each item has a brief explanation and solution that is specific to the Node.js environment. This cheat sheet lists actions developers can take to develop secure Node.js applications. NodeJS Security Cheat Sheet ¶ Introduction ¶ Insecure Direct Object Reference PreventionĪdhere to general application security principlesĪdditional resources about Node.js security
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