freeCodeCamp/curriculum/challenges/english/09-information-security/information-security-with-helmetjs/hide-potentially-dangerous-information-using-helmet.hidepoweredby.md

---
id: 587d8247367417b2b2512c37
title: Hide Potentially Dangerous Information Using helmet.hidePoweredBy()
challengeType: 2
forumTopicId: 301580
dashedName: hide-potentially-dangerous-information-using-helmet-hidepoweredby
---

# --description--

As a reminder, this project is being built upon the following starter project on [Repl.it](https://repl.it/github/freeCodeCamp/boilerplate-infosec), or cloned from [GitHub](https://github.com/freeCodeCamp/boilerplate-infosec/).

Hackers can exploit known vulnerabilities in Express/Node if they see that your site is powered by Express. X-Powered-By: Express is sent in every request coming from Express by default. The `helmet.hidePoweredBy()` middleware will remove the X-Powered-By header. You can also explicitly set the header to something else, to throw people off. e.g. `app.use(helmet.hidePoweredBy({ setTo: 'PHP 4.2.0' }))`

# --hints--

helmet.hidePoweredBy() middleware should be mounted correctly

```js
(getUserInput) =>
  $.get(getUserInput('url') + '/_api/app-info').then(
    (data) => {
      assert.include(data.appStack, 'hidePoweredBy');
      assert.notEqual(data.headers['x-powered-by'], 'Express');
    },
    (xhr) => {
      throw new Error(xhr.responseText);
    }
  );
```

# --solutions--

```js
/**
  Backend challenges don't need solutions, 
  because they would need to be tested against a full working project. 
  Please check our contributing guidelines to learn more.
*/
```