puppeteer/website/versioned_docs/version-25.4.0/api/puppeteer.page.emulatenetworkconditions.md

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Page.emulateNetworkConditions

Page.emulateNetworkConditions() method

This does not affect WebSockets and WebRTC PeerConnections (see https://crbug.com/563644). To set the page offline, you can use Page.setOfflineMode().

A list of predefined network conditions can be used by importing PredefinedNetworkConditions.

Signature

class Page {
  abstract emulateNetworkConditions(
    networkConditions: NetworkConditions | null,
  ): Promise<void>;
}

Parameters

Parameter	Type	Description
networkConditions	NetworkConditions | null	Passing null disables network condition emulation.

Returns:

Promise<void>

Example

import {PredefinedNetworkConditions} from 'puppeteer';
const slow3G = PredefinedNetworkConditions['Slow 3G'];

const browser = await puppeteer.launch();
const page = await browser.newPage();
await page.emulateNetworkConditions(slow3G);
await page.goto('https://www.google.com');
// other actions...
await browser.close();