koa-helmet

koa-helmet

koa-helmet is a wrapper for helmet to work with koa. It provides important security headers to make your app more secure by default.

Installation

yarn add koa-helmet

or via npm:

npm install koa-helmet --save

Usage

Usage is the same as helmet

Helmet offers 14 security middleware functions:

Module	Default?
contentSecurityPolicy for setting Content Security Policy
permittedCrossDomainPolicies for handling Adobe products' crossdomain requests
dnsPrefetchControl controls browser DNS prefetching	✓
expectCt for handling Certificate Transparency
featurePolicy to limit your site's features
frameguard to prevent clickjacking	✓
hidePoweredBy to remove the X-Powered-By header	✓
hpkp for HTTP Public Key Pinning
hsts for HTTP Strict Transport Security	✓
ieNoOpen sets X-Download-Options for IE8+	✓
noCache to disable client-side caching
noSniff to keep clients from sniffing the MIME type	✓
referrerPolicy to hide the Referer header
xssFilter adds some small XSS protections	✓

You can see more in the documentation.

Note:

In order to work well with the helmet HSTS module, koa-helmet will augment this.request to include a secure boolean to determine if the request is over HTTPS.

Example

"use strict";

const Koa = require("koa");
const helmet = require("koa-helmet");
const app = new Koa();

app.use(helmet());

app.use((ctx) => {
  ctx.body = "Hello World"
});

app.listen(4000);

Testing

To run the tests, simply run

yarn test

Versioning

• koa-helmet >=2.x (master branch) supports koa 2.x
• koa-helmet 1.x (koa-1 branch) supports koa 0.x and koa 1.x