Express application should use Helmet

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Metadata

ID: javascript-express/missing-helmet

Language: JavaScript

Severity: Warning

Category: Security

Description

Per Express documentation:

Helmet can help protect your app from some well-known web vulnerabilities by setting HTTP headers appropriately.

This rule will check whether you’ve set app.use(helmet()) within the file that you’ve called express()

Non-Compliant Code Examples

const express = require("express")

const app = express();

// no `app.use(helmet())` helmet detected in the file

app.get("/foo", (req, res) => res.send("foo"));

app.listen(8000);

Compliant Code Examples

const express = require("express")
const helmet = require("helmet")

const app = express();

app.use(json()); // helmet detected
app.use(helmet()); // helmet detected

app.get("/foo", (req, res) => res.send("foo"));

app.listen(8000);
import express from "express"
import helmet from "helmet"

const app = express();

app.use(helmet()); // helmet detected

app.get("/foo", (req, res) => res.send("foo"));

app.listen(8000);