Puppeteer can configure where a browser saves downloads and whether downloads are allowed, but it does not currently provide a built-in programmatic download-completion or file-management API. You can set a download policy and destination, then use Node.js code to wait for, validate, name, and clean up the resulting file. Keep that browser setup separate from Puppeteer’s documented file-upload support.
What Puppeteer does—and does not—manage
The Puppeteer 25.12.0 Files guide states: “Currently, Puppeteer does not offer a way to handle file downloads in a programmatic way.” In practical terms, download configuration tells the browser whether to permit downloads and where to save them. It does not give your script a built-in Puppeteer download-completed event, returned file object, integrity check, rename operation, or cleanup routine.
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Those lifecycle tasks belong to your application: trigger the download, monitor the destination directory, decide when to stop waiting, inspect the file, and remove it when appropriate. The exact waiting and validation strategy is not prescribed by Puppeteer’s Files guide, so treat the Node.js example below as an application-side pattern and test it against your installed Puppeteer and browser versions.
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Downloads are not uploads
Puppeteer’s Files guide demonstrates uploading a local file by waiting for an input[type=file] element and calling uploadFile(['./path-to-local-file']). That API sends a file from your machine to a page. It does not configure or monitor a browser download from a page to your machine.
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Choose a browser and package setup
Use puppeteer when you want the package to download and manage its compatible browser installation. Use puppeteer-core when you provide the browser yourself or connect to a remote browser. Your download configuration must target the browser context actually used by the page.
| Setup | Browser ownership | When it fits |
|---|---|---|
puppeteer |
Installing the package downloads Chrome for Testing and chrome-headless-shell. |
You want the standard locally managed Puppeteer browser setup. |
puppeteer-core |
Does not download Chrome; the developer manages the browser or connects remotely. | You already have a browser deployment or use a remote DevTools-compatible browser. |
The Puppeteer 25.12.0 Installation guide gives approximate browser download sizes of 170 MB on macOS, 282 MB on Linux, and 280 MB on Windows. These are platform-specific approximate figures from that guide, not permanent size guarantees.
Configure a download destination and policy
The DownloadBehavior API reference defines a policy and a downloadPath. The path is required with either allow or allowAndName. The available policies are allow, allowAndName, deny, and default; default behavior is left to the browser.
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allow: permit downloads and save them to the configured path using browser/server-provided names.allowAndName: permit downloads but name files according to their download GUIDs. Do not expect the original filename in this mode.deny: deny downloads.default: use the browser’s default download behavior.
ConnectOptions exposes downloadBehavior as a context-level setting. The BrowserContextOptions Next reference also lists it and says that unset behavior defaults to the browser default; that page is explicitly a Next reference, not a stable-release guarantee. Match the code to your installed Puppeteer version and browser protocol.
Example: set behavior when connecting
This example illustrates the documented ConnectOptions setting when connecting to a browser endpoint. It uses allow so the saved filename is not replaced with a GUID. Supply a valid endpoint and an absolute writable directory for your environment.
import puppeteer from 'puppeteer-core';
import path from 'node:path';
const downloadPath = path.resolve('./downloads');
const browser = await puppeteer.connect({
browserWSEndpoint: process.env.PUPPETEER_WS_ENDPOINT,
downloadBehavior: {
policy: 'allow',
downloadPath,
},
});
try {
const page = await browser.newPage();
await page.goto('https://example.com', { waitUntil: 'domcontentloaded' });
await page.click('a[data-download]');
// Download completion and file handling are application-managed.
} finally {
await browser.disconnect();
}This shows browser policy configuration, not a completion API. The page selector and URL are illustrative and must match the site being automated. Create the destination directory before connecting if your environment requires it, and ensure the browser process—not only the Node.js process—can write there. For a locally launched browser, configure the relevant context using the API supported by the Puppeteer version you have installed; do not assume a connection option is interchangeable with an older page-level snippet.
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Wait for and manage the downloaded file in Node.js
Since Puppeteer does not report download completion through a built-in file-download handler, your application needs a bounded strategy. The following runnable pattern uses Node.js filesystem checks to wait until a file appears and its size remains unchanged across multiple checks. It ignores common in-progress temporary suffixes, enforces a timeout, and rejects empty output. These are application-level safeguards, not Puppeteer guarantees; adapt temporary-file rules to the browser and download server in use.
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import { readdir, stat, mkdir } from 'node:fs/promises';
import path from 'node:path';
import puppeteer from 'puppeteer';
const downloadPath = path.resolve('./downloads');
await mkdir(downloadPath, { recursive: true });
async function waitForCompletedFile(directory, {
timeoutMs = 60_000,
intervalMs = 500,
stableChecks = 3,
} = {}) {
const deadline = Date.now() + timeoutMs;
const sizes = new Map();
const temporarySuffixes = ['.crdownload', '.part', '.tmp'];
while (Date.now() < deadline) {
for (const name of await readdir(directory)) {
if (temporarySuffixes.some(suffix => name.endsWith(suffix))) continue;
const fullPath = path.join(directory, name);
let info;
try {
info = await stat(fullPath);
} catch {
continue; // File may have disappeared between listing and stat.
}
if (!info.isFile() || info.size === 0) continue;
const previous = sizes.get(name);
const stable = previous && previous.size === info.size
? previous.count + 1
: 1;
sizes.set(name, { size: info.size, count: stable });
if (stable >= stableChecks) return fullPath;
}
await new Promise(resolve => setTimeout(resolve, intervalMs));
}
throw new Error(`No completed non-empty download appeared within ${timeoutMs} ms`);
}
const browser = await puppeteer.launch({ headless: true });
try {
const page = await browser.newPage();
await page.goto('https://example.com', { waitUntil: 'domcontentloaded' });
await page.click('a[data-download]');
const filePath = await waitForCompletedFile(downloadPath);
const fileInfo = await stat(filePath);
console.log({ filePath, bytes: fileInfo.size });
// Validate expected type/content here before using the file.
} finally {
await browser.close();
}The launch snippet does not show a version-independent context configuration call: set downloadBehavior using the API surface documented for your installed release and browser setup. The API references linked above should be checked alongside the exact package version in your lockfile.
Make file handling safe
- Use a dedicated directory per run or job so concurrent downloads do not get mistaken for one another.
- Use an explicit timeout and fail clearly if the expected file does not arrive.
- Check that the file is non-empty and validate its expected format or contents before processing it. A stable size alone does not prove a valid or complete document.
- For workflows that require a specific output name, prefer
allowand validate the resulting name, or perform an application-side rename after confirming completion. WithallowAndName, map GUID-named files to jobs using your own job bookkeeping. - Remove temporary or completed files only after downstream work succeeds or fails according to your retention policy; ensure cleanup code does not delete another concurrent job’s files.
Install the browser if Puppeteer cannot find it
With puppeteer, browser installation normally runs as part of package installation. If package-manager settings block install scripts, the browser download can be skipped and launch may fail with a missing Chrome error. The Puppeteer 25.12.0 Installation guide documents this manual installation command:
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Troubleshoot common download problems
| Symptom | Likely cause | What to check |
|---|---|---|
| Launch fails because Chrome is missing | Package install scripts were blocked, or puppeteer-core is being used without a managed browser. |
For the standard package, run npx puppeteer browsers install and review install-script settings. For core, provide a browser or remote endpoint. |
| No file appears in the target directory | Download policy is not allowing the operation, the configured path is wrong, or the browser process cannot write there. | Use a writable absolute path; ensure downloadPath is provided with allow or allowAndName; confirm the page action actually starts a download. |
| Code waits forever | The application has no timeout, the download never began, or its completion indicator differs from the implementation’s assumptions. | Bound the wait, log directory contents, inspect the page action and browser behavior, and adapt temporary-file detection to the browser in use. |
| Saved filename is unexpected | allowAndName intentionally uses download GUIDs, or the server supplied a different name than expected. |
Use allow when the server-provided name is needed, or maintain an application mapping and rename only after validating completion. |
| Older snippet has no effect or fails | It may use a page-level API that does not match the current context-level API or protocol. | Check the documentation for the exact installed Puppeteer release and the connected browser protocol rather than mixing old snippets with current options. |
| File exists but is corrupt or incomplete | Existence or stable size was treated as proof of correctness. | Validate expected file type and contents, and use a server-specific success signal where available; filesystem stability is only a practical heuristic. |
Performance, reliability, and cost considerations
Use a per-job destination to avoid expensive directory scans and ambiguous matches when several pages download concurrently. Set a timeout based on the expected file sizes and network conditions rather than waiting indefinitely. For large files, avoid reading the entire file into memory just to confirm it exists; inspect metadata first and validate content using a streaming or format-specific check suited to the file.
Reliability depends on both sides of the workflow: browser permission and writable storage, plus application logic that detects the right output and handles failures. Puppeteer’s documentation establishes the policy/path configuration but not a universal completion-detection method, so validate your chosen strategy against your specific browser, site, and concurrency model. Downloaded browser binaries also add installation time and disk use; the platform-size figures above are approximate values from Puppeteer’s version 25.12.0 guide.
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Frequently Asked Questions
Does Puppeteer have a built-in download-finished event?
No. Its Files guide says programmatic download handling is not currently offered; completion detection must be implemented by your application.
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No. It names files according to their download GUIDs.
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