It is up to you to choose the best library as per your project requirements. Each of them has its advantages and drawbacks. In this article, I discussed five different Express middleware libraries. Note: You can also use the CORS configuration options for further customizations.

contentSecurityPolicy-set the Content-Security-Policy with ntentSecurityPolicy (options) to prevent cross-site scripting attacks.

Let's consider two of these popular configuration options Helmet offers.

This could be one of the reasons why using Helmet is recommended in the Express.js security best practices.

The top-level Helmet function wraps 15 smaller middlewares. var express =require('express') var app =express() var helmet =require('helmet') app.use(helmet()) Usage of Helmet Then, include it into your app like this. You can install Helmet.js for your Express.js application with the following command. Helmet has over 1 million NPM downloads per week and 8.6K GitHub ratings.

Has some browser-specific configuration options ( helmet.ieNoOpen()for Internet Explorer 8).

In addition, it comes with a way to allow web applications to isolate their origins with Origin-Agent-Cluster header.

Instructs browsers to use HTTPS instead of insecure HTTP.It secures your Node.js application from common security vulnerabilities such as clickjacking, implementation of strict HTTP, and download options for vulnerable browsers such as IE8.It is a quick and straightforward way to create an additional layer of security by switching from Express default headers to more standard ones. Helmet helps you secure your Express apps by setting various HTTP headers.

What is express js