puppeteer/website/versioned_docs/version-22.4.1/guides/configuration.mdx
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# Configuration
```mdx-code-block
import Tabs from '@theme/Tabs';
import TabItem from '@theme/TabItem';
```
All defaults in Puppeteer can be customized in two ways:
1. [Configuration files](#configuration-files) (**recommended**)
2. [Environment variables](#environment-variables)
:::caution
Note that some options are only customizable through environment variables (such
as `HTTPS_PROXY`).
:::
:::caution
Puppeteer's configuration files and environment variables are ignored by `puppeteer-core`.
:::
## Configuration files
Configuration files are the **recommended** choice for configuring Puppeteer.
Puppeteer will look up the file tree for any of the following formats:
- `.puppeteerrc.cjs`,
- `.puppeteerrc.js`,
- `.puppeteerrc` (YAML/JSON),
- `.puppeteerrc.json`,
- `.puppeteerrc.yaml`,
- `puppeteer.config.js`, and
- `puppeteer.config.cjs`
Puppeteer will also read a `puppeteer` key from your application's
`package.json`.
See the [`Configuration`](../api/puppeteer.configuration) interface for possible
options.
:::caution
After adding a configuration file, you may need to remove and reinstall
`puppeteer` for it to take effect if the changes affect installation.
:::
### Examples
#### Changing the default cache directory
Starting in v19.0.0, Puppeteer stores browsers in `~/.cache/puppeteer` to
globally cache browsers between installation. This can cause problems if
`puppeteer` is packed during some build step and moved to a fresh location. The
following configuration can solve this issue (reinstall `puppeteer` to take
effect):
```js title="project-directory/.puppeteerrc.cjs"
const {join} = require('path');
/**
* @type {import("puppeteer").Configuration}
*/
module.exports = {
// Changes the cache location for Puppeteer.
cacheDirectory: join(__dirname, '.cache', 'puppeteer'),
};
```
:::note
Notice this is only possible with CommonJS configuration files as information
about the ambient environment is needed (in this case, `__dirname`).
:::
## Environment variables
Along with configuration files, Puppeteer looks for certain
[environment variables](https://en.wikipedia.org/wiki/Environment_variable) for
customizing behavior. Environment variables will always override configuration
file options when applicable.
The following options are _environment-only_ options
- `HTTP_PROXY`, `HTTPS_PROXY`, `NO_PROXY` - defines HTTP proxy settings that are
used to download and run the browser.
All other options can be found in the documentation for the
[`Configuration`](../api/puppeteer.configuration) interface.