puppeteer/website/versioned_docs/version-20.8.3/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 {
  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'];

(async () => {
  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();
})();