puppeteer/docs/api/puppeteer.browserfetcher.md
2022-07-05 15:41:43 +02:00

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---
sidebar_label: BrowserFetcher
---
# BrowserFetcher class
BrowserFetcher can download and manage different versions of Chromium and Firefox.
**Signature:**
```typescript
export declare class BrowserFetcher
```
## Remarks
BrowserFetcher operates on revision strings that specify a precise version of Chromium, e.g. `"533271"`. Revision strings can be obtained from [omahaproxy.appspot.com](http://omahaproxy.appspot.com/). In the Firefox case, BrowserFetcher downloads Firefox Nightly and operates on version numbers such as `"75"`.
The constructor for this class is marked as internal. Third-party code should not call the constructor directly or create subclasses that extend the `BrowserFetcher` class.
## Example
An example of using BrowserFetcher to download a specific version of Chromium and running Puppeteer against it:
```ts
const browserFetcher = puppeteer.createBrowserFetcher();
const revisionInfo = await browserFetcher.download('533271');
const browser = await puppeteer.launch({
executablePath: revisionInfo.executablePath,
});
```
\*\*NOTE\*\* BrowserFetcher is not designed to work concurrently with other instances of BrowserFetcher that share the same downloads directory.
## Methods
| Method | Modifiers | Description |
| ------------------------------------------------------------------------------ | --------- | --------------------------------------------------------------- |
| [canDownload(revision)](./puppeteer.browserfetcher.candownload.md) | | Initiates a HEAD request to check if the revision is available. |
| [download(revision, progressCallback)](./puppeteer.browserfetcher.download.md) | | Initiates a GET request to download the revision from the host. |
| [host()](./puppeteer.browserfetcher.host.md) | | |
| [localRevisions()](./puppeteer.browserfetcher.localrevisions.md) | | |
| [platform()](./puppeteer.browserfetcher.platform.md) | | |
| [product()](./puppeteer.browserfetcher.product.md) | | |
| [remove(revision)](./puppeteer.browserfetcher.remove.md) | | |
| [revisionInfo(revision)](./puppeteer.browserfetcher.revisioninfo.md) | | |