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Puppeteer can configure a browser’s download policy and destination folder, but it does not provide a built-in API for handling a download’s completion or file lifecycle. Its Files guide says, “Currently, Puppeteer does not offer a way to handle file downloads in a programmatic way.” You can allow a browser download, then use Node.js code to detect, validate, rename, and clean up the resulting file.
What Puppeteer does—and does not—manage
Download configuration tells the browser whether downloads are allowed and where to save them. It does not give your Puppeteer script a documented download-complete event or manage the file after it is saved. The official Files guide for Puppeteer 25.12.0 makes this limitation explicit: Puppeteer Files guide.
That distinction matters in automation: a click that starts a download is not proof that the file finished writing, is complete, or has the name your application expects. Your Node.js application must handle those checks. The API reference documents the browser-side policy and path settings; confirm that the API matches the Puppeteer version and browser protocol you actually run.
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Downloads are not uploads
The Files guide’s example using input[type=file] and uploadFile() is for uploading a local file through a page form. It does not download a file from the page. Do not treat upload support as a download-completion API.
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Configure a download directory and policy
Use a dedicated directory for each browser context or job. The DownloadBehavior API describes three policy choices: allow downloads, deny them, or use the browser’s default behavior. It requires downloadPath when the policy is allow or allowAndName. With allowAndName, files are named according to their download GUIDs; do not expect the server-provided filename to be preserved.
In the Puppeteer 25.12.0 API, ConnectOptions exposes downloadBehavior as a context-level setting. The following illustrates the shape of that configuration; adapt it to the browser connection and version in your application:
const browser = await puppeteer.connect({
browserWSEndpoint: process.env.BROWSER_WS_ENDPOINT,
downloadBehavior: {
policy: 'allow',
downloadPath: downloadDir,
},
});The example assumes downloadDir already exists and that your installed Puppeteer version accepts this configuration. Consult the ConnectOptions API reference for the exact version in use. Puppeteer’s BrowserContextOptions Next reference also lists downloadBehavior, but it is explicitly a Next reference, not a stable-release guarantee.
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Choose a policy for the job
allow: permit downloads and setdownloadPathto the destination.allowAndName: permit downloads and use GUID-based names, withdownloadPathset. Your application may need to map those names to its own records.- Default or deny: use the browser’s default behavior or prevent downloads, as appropriate for the context. Do not assume a default destination or policy without checking the browser setup.
Wait for and manage the downloaded file in Node.js
Because Puppeteer does not provide programmatic download handling, completion detection and file lifecycle management are application responsibilities. One practical pattern is to create a fresh directory for the job, trigger the download, then poll for a file that exists, is no longer changing size, and passes application-specific checks. This is an implementation pattern, not a recipe prescribed by Puppeteer’s documentation.
const fs = require('node:fs/promises');
const path = require('node:path');
const { setTimeout: delay } = require('node:timers/promises');
async function waitForStableFile(directory, timeoutMs = 60_000) {
const deadline = Date.now() + timeoutMs;
let previous = new Map();
while (Date.now() < deadline) {
const entries = await fs.readdir(directory, { withFileTypes: true });
const files = [];
for (const entry of entries) {
if (!entry.isFile() || entry.name.endsWith('.crdownload')) continue;
const fullPath = path.join(directory, entry.name);
const stat = await fs.stat(fullPath);
files.push({ path: fullPath, size: stat.size });
}
for (const file of files) {
const oldSize = previous.get(file.path);
if (oldSize !== undefined && oldSize === file.size && file.size > 0) {
return file;
}
}
previous = new Map(files.map(file => [file.path, file.size]));
await delay(500);
}
throw new Error(`No stable downloaded file appeared within ${timeoutMs} ms`);
}This Chromium-oriented example ignores a common partial-download suffix, but that is not a universal completion signal. Adapt it to the browser and download types you support. A size that stops changing can still represent an incomplete or invalid file; where correctness matters, validate expected file type, minimum or exact size, checksum, or parseability before accepting it. Set a finite timeout and report a useful failure rather than waiting indefinitely.
Use safe names and cleanup rules
- Keep downloads in an isolated directory rather than mixing them with other jobs or user files.
- Do not trust a suggested filename as a safe filesystem path. Generate an application-owned name or sanitize the name before moving the validated file.
- Use file-type or content checks appropriate to the expected artifact; an extension alone does not prove the contents are valid.
- Delete temporary files and job directories in a
finallyblock after success or failure, unless retention is required for audit or recovery. - When parallel jobs run, give each its own destination so one job cannot mistake another job’s file for its own.
Choose the right Puppeteer browser setup
| Setup | Browser ownership | Useful when | Download consideration |
|---|---|---|---|
puppeteer |
The package downloads Chrome for Testing and chrome-headless-shell by default and drives Chrome using puppeteer-core. |
You want Puppeteer to provide the browser installation as part of package setup. | Configure download behavior for the browser/context you launch, and keep the destination isolated. |
puppeteer-core |
Does not download Chrome; intended for remote connections or browsers you manage yourself. | You already have a remote browser or control executable installation and updates. | Verify that your remote or separately managed browser supports the protocol behavior expected by your Puppeteer version. |
The official Puppeteer Installation guide lists approximate browser-download sizes of 170 MB on macOS, 282 MB on Linux, and 280 MB on Windows for the documented 25.12.0 setup. These are approximate, platform-specific figures, not permanent size guarantees.
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Fix common setup and download problems
Launching fails with a missing Chrome error
Puppeteer’s install guide says package-manager configurations that block install scripts can skip the browser download. Check the package manager’s install-script policy, then run the documented manual install command:
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The browser does not save the download where expected
- Confirm that the active context has the intended download behavior, rather than assuming a page-level setting or unrelated context controls it.
- For
alloworallowAndName, verify thatdownloadPathis set and that the process can write to it. - Check which browser instance is connected. A remote or separately managed browser may have different filesystem paths and permissions from the Node.js host.
- Confirm that the browser’s protocol behavior and your installed Puppeteer API version are compatible.
The script times out or captures a partial file
A click, navigation, or fixed delay alone does not establish that a file has completed. Use a bounded application-side wait, ignore temporary artifacts where appropriate, and validate the final file before consuming it. Increase the timeout only when expected download size or network conditions justify it; also log the directory contents and sizes on failure.
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The filename is unexpected
If you selected allowAndName, GUID-based naming is expected. Record the files produced by that job and associate the validated result with your own application-level name instead of relying on the server filename.
Or skip the browser setup
If your goal is a clean screenshot of a page rather than downloading an arbitrary file, ScreenshotNeo provides a website screenshot API and MCP server for developers. It does not replace Puppeteer for general browser download workflows, but a single GET request can return an image or PDF:
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Frequently Asked Questions
Does Puppeteer support file uploads?
Yes. Its Files guide documents uploading a local file through a file input with `uploadFile()`; that is separate from downloading files.
Does `allowAndName` keep the original download filename?
No. The API reference says it names files according to their download GUIDs.
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