What is helmet.js and how is it used?
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Helmet.js is a popular middleware for Node.js/Express applications that helps secure apps by setting various HTTP headers. Since Express apps by default don’t handle security headers, Helmet adds them to protect against common web vulnerabilities like Cross-Site Scripting (XSS), Clickjacking, and MIME type sniffing.
It is lightweight and works by bundling smaller middleware functions that configure different headers. For example:
helmet.contentSecurityPolicy() → helps prevent XSS by controlling sources of scripts.
helmet.frameguard() → protects against clickjacking by controlling the X-Frame-Options header.
helmet.noSniff() → prevents browsers from MIME-sniffing a response away from the declared type.
helmet.hsts() → enforces HTTPS via Strict-Transport-Security header.
Usage Example:
const express = require("express");
const helmet = require("helmet");
const app = express();
app.use(helmet()); // enables default security headers
app.get("/", (req, res) => {
res.send("Secure Express app with Helmet!");
});
app.listen(3000);
In short, Helmet.js acts as a security shield for Express apps by configuring headers properly, making them less vulnerable to common web attacks with minimal effort.
👉 Do you want me to also list the default headers applied by Helmet when no options are passed?
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