[Home](./index.md) > [puppeteer](./puppeteer.md) > [Puppeteer](./puppeteer.puppeteer.md) ## Puppeteer class The main Puppeteer class. IMPORTANT: if you are using Puppeteer in a Node environment, you will get an instance of [PuppeteerNode](./puppeteer.puppeteernode.md) when you import or require `puppeteer`. That class extends `Puppeteer`, so has all the methods documented below as well as all that are defined on [PuppeteerNode](./puppeteer.puppeteernode.md). Signature: ```typescript export declare class Puppeteer ``` ## Remarks The constructor for this class is marked as internal. Third-party code should not call the constructor directly or create subclasses that extend the `Puppeteer` class. ## Properties | Property | Modifiers | Type | Description | | --- | --- | --- | --- | | [\_changedProduct](./puppeteer.puppeteer._changedproduct.md) | | boolean | | | [\_isPuppeteerCore](./puppeteer.puppeteer._ispuppeteercore.md) | | boolean | | | [devices](./puppeteer.puppeteer.devices.md) | | [DevicesMap](./puppeteer.devicesmap.md) | | | [errors](./puppeteer.puppeteer.errors.md) | | [PuppeteerErrors](./puppeteer.puppeteererrors.md) | | | [networkConditions](./puppeteer.puppeteer.networkconditions.md) | | [PredefinedNetworkConditions](./puppeteer.predefinednetworkconditions.md) | | ## Methods | Method | Modifiers | Description | | --- | --- | --- | | [clearCustomQueryHandlers()](./puppeteer.puppeteer.clearcustomqueryhandlers.md) | | Clears all registered handlers. | | [connect(options)](./puppeteer.puppeteer.connect.md) | | This method attaches Puppeteer to an existing browser instance. | | [customQueryHandlerNames()](./puppeteer.puppeteer.customqueryhandlernames.md) | | | | [registerCustomQueryHandler(name, queryHandler)](./puppeteer.puppeteer.registercustomqueryhandler.md) | | Registers a [custom query handler](./puppeteer.customqueryhandler.md). After registration, the handler can be used everywhere where a selector is expected by prepending the selection string with <name>/. The name is only allowed to consist of lower- and upper case latin letters. | | [unregisterCustomQueryHandler(name)](./puppeteer.puppeteer.unregistercustomqueryhandler.md) | | |