puppeteer/new-docs/puppeteer.browserfetcher.md

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[Home](./index.md) &gt; [puppeteer](./puppeteer.md) &gt; [BrowserFetcher](./puppeteer.browserfetcher.md)

## BrowserFetcher class

BrowserFetcher can download and manage different versions of Chromium and Firefox.

<b>Signature:</b>

```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:

```js
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) |  |  |