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Call await worker.close() on a Puppeteer WebWorker instance. To find dedicated workers attached to a page, use page.workers(); it does not include ServiceWorkers. Puppeteer also exposes page events for observing worker creation and destruction.
Close a Puppeteer WebWorker
When you already have a worker object, close it directly:
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await worker.close();The Puppeteer API reference lists WebWorker.close(), but does not specify its protocol-level implementation. Treat it as the documented worker API rather than assuming details about how the browser terminates the underlying worker. Puppeteer WebWorker API
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page.workers() returns the dedicated WebWorkers associated with a page. It explicitly excludes ServiceWorkers. Use the worker URL to identify each listed worker:
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for (const worker of page.workers()) {
console.log('Worker URL:', worker.url());
await worker.close();
}To observe worker lifecycle changes on a page, listen for workercreated and workerdestroyed:
page.on('workercreated', worker => {
console.log('Worker created:', worker.url());
});
page.on('workerdestroyed', worker => {
console.log('Worker destroyed:', worker.url());
});These event names and methods are documented by Puppeteer. The examples show how to combine them; they are not claims of a tested run. Puppeteer Page API
Choose the cleanup scope you need
Closing a worker is narrower than closing its page or browser. Choose the method whose documented scope matches the cleanup you intend:
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await worker.close() |
Closes the Puppeteer WebWorker instance; the API entry does not detail protocol-level behavior. WebWorker API |
await page.close() |
Closes the page. Page.close() |
await browserContext.close() |
Closes the browser context and its associated pages. The default browser context cannot be closed. BrowserContext.close() |
await browser.close() |
Closes the browser and all associated pages. Browser.close() |
await browser.disconnect() |
Detaches Puppeteer while leaving the browser process running; this is not browser shutdown. Browser.disconnect() |
These are different cleanup scopes. The documented scopes do not establish that closing a page, context, or browser has exactly the same lifecycle semantics as calling WebWorker.close().
Common mistakes and checks
- Looking for a ServiceWorker in
page.workers(): that method excludes ServiceWorkers. It lists dedicated WebWorkers associated with the page. - Closing the browser when only a worker should be addressed:
browser.close()closes the browser and all associated pages, a broader action than callingworker.close(). - Using
browser.disconnect()to stop the browser: disconnect detaches Puppeteer but leaves the browser process running. Usebrowser.close()when the goal is browser shutdown. - Assuming undocumented termination mechanics: Puppeteer’s API lists the worker’s
close()method but does not describe its protocol implementation. Rely on the documented method and scope, not an inferred mechanism.
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