80 lines
3.4 KiB
Markdown
80 lines
3.4 KiB
Markdown
Helmet
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======
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[](http://badge.fury.io/js/helmet)
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[](https://david-dm.org/helmetjs/helmet)
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[](https://travis-ci.org/helmetjs/helmet)
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[](https://app.fossa.io/projects/git%2Bhttps%3A%2F%2Fgithub.com%2Fhelmetjs%2Fhelmet?ref=badge_shield)
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Helmet helps you secure your Express apps by setting various HTTP headers. *It's not a silver bullet*, but it can help!
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[Looking for a version of Helmet that supports the Koa framework?](https://github.com/venables/koa-helmet)
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Quick start
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-----------
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First, run `npm install helmet --save` for your app. Then, in an Express (or Connect) app:
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```js
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const express = require('express')
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const helmet = require('helmet')
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const app = express()
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app.use(helmet())
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// ...
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```
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It's best to `use` Helmet early in your middleware stack so that its headers are sure to be set.
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You can also use its pieces individually:
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```js
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app.use(helmet.xssFilter())
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app.use(helmet.frameguard())
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```
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You can disable a middleware that's normally enabled by default. This will disable `frameguard` but include the other defaults.
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```js
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app.use(helmet({
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frameguard: false
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}))
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```
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You can also set options for a middleware. Setting options like this will *always* include the middleware, whether or not it's a default.
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```js
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app.use(helmet({
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frameguard: {
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action: 'deny'
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}
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}))
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```
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*If you're using Express 3, make sure these middlewares are listed before `app.router`.*
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How it works
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------------
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Helmet is a collection of 14 smaller middleware functions that set HTTP response headers. Running `app.use(helmet())` will not include all of these middleware functions by default.
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| Module | Default? |
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|---|---|
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| [contentSecurityPolicy](https://helmetjs.github.io/docs/csp/) for setting Content Security Policy | |
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| [crossdomain](https://helmetjs.github.io/docs/crossdomain/) for handling Adobe products' crossdomain requests | |
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| [dnsPrefetchControl](https://helmetjs.github.io/docs/dns-prefetch-control) controls browser DNS prefetching | ✓ |
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| [expectCt](https://helmetjs.github.io/docs/expect-ct/) for handling Certificate Transparency | |
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| [featurePolicy](https://helmetjs.github.io/docs/feature-policy/) to limit your site's features | |
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| [frameguard](https://helmetjs.github.io/docs/frameguard/) to prevent clickjacking | ✓ |
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| [hidePoweredBy](https://helmetjs.github.io/docs/hide-powered-by) to remove the X-Powered-By header | ✓ |
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| [hpkp](https://helmetjs.github.io/docs/hpkp/) for HTTP Public Key Pinning | |
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| [hsts](https://helmetjs.github.io/docs/hsts/) for HTTP Strict Transport Security | ✓ |
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| [ieNoOpen](https://helmetjs.github.io/docs/ienoopen) sets X-Download-Options for IE8+ | ✓ |
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| [noCache](https://helmetjs.github.io/docs/nocache/) to disable client-side caching | |
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| [noSniff](https://helmetjs.github.io/docs/dont-sniff-mimetype) to keep clients from sniffing the MIME type | ✓ |
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| [referrerPolicy](https://helmetjs.github.io/docs/referrer-policy) to hide the Referer header | |
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| [xssFilter](https://helmetjs.github.io/docs/xss-filter) adds some small XSS protections | ✓ |
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You can see more in [the documentation](https://helmetjs.github.io/docs/).
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