Use Node.js, Puppeteer, and a CSV parser to read each URL, navigate to it, save a uniquely named screenshot, and log row-level failures so one bad page does not stop the batch. The example below processes URLs sequentially; choose a page-ready condition for your target sites rather than assuming network idle works everywhere.
What you need before you start
- Node.js and npm.
- A CSV file with a column named
url. - Puppeteer and its compatible browser. Installing
puppeteernormally downloads compatible Chrome;puppeteer-coredoes not download a browser. See the Puppeteer installation and overview documentation. - A CSV parser. Use a real parser if fields can contain commas, quotation marks, or line breaks; splitting each line on commas is not a reliable CSV parser.
Puppeteer is a JavaScript library for controlling Chrome or Firefox and runs headless by default. Its documented screenshot flow is to launch a browser, create a page, navigate, call Page.screenshot(), and close the browser.
Install the dependencies
For example, create a project and install Puppeteer plus the csv-parse package:
npm init -y
npm install puppeteer csv-parseThis example uses the parser’s synchronous API. If your package manager blocks dependency install scripts, the browser download may not happen; Puppeteer documents npx puppeteer browsers install as a manual browser-install path.
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Prepare the CSV and output names
Save a header row named url. For example:
url
https://example.com
https://www.iana.org/domains/reservedEach row needs a nonempty, valid HTTP or HTTPS URL. The script below derives filenames from row numbers, not URL text: this avoids collisions when URLs repeat and avoids unsafe characters in filenames. It writes screenshots to a screenshots directory and records one JSON object per input row in results.jsonl.
Run a sequential Puppeteer batch
Save the following as capture.js in the project directory. It continues after an invalid URL or a per-page navigation/capture failure, closes each page, and closes the browser when the job finishes.
const fs = require('node:fs');
const path = require('node:path');
const { parse } = require('csv-parse/sync');
const puppeteer = require('puppeteer');
const inputPath = process.argv[2] || 'urls.csv';
const outputDir = process.argv[3] || 'screenshots';
const resultsPath = path.join(outputDir, 'results.jsonl');
const timeoutMs = 30_000; // Example setting; adjust for your pages.
const waitUntil = 'networkidle2'; // Example readiness choice; see guidance below.
function validateUrl(value) {
const trimmed = String(value ?? '').trim();
if (!trimmed) throw new Error('URL is empty');
let parsed;
try {
parsed = new URL(trimmed);
} catch {
throw new Error('URL is not valid');
}
if (parsed.protocol !== 'http:' && parsed.protocol !== 'https:') {
throw new Error('URL must use http or https');
}
return parsed.href;
}
async function main() {
const csvText = fs.readFileSync(inputPath, 'utf8');
const rows = parse(csvText, {
columns: true,
skip_empty_lines: true,
bom: true,
trim: true,
});
fs.mkdirSync(outputDir, { recursive: true });
fs.writeFileSync(resultsPath, '');
const browser = await puppeteer.launch();
try {
for (let index = 0; index < rows.length; index++) {
const row = rows[index];
const rowNumber = index + 1;
const outputPath = path.join(
outputDir,
`row-${String(rowNumber).padStart(5, '0')}.png`
);
let page;
try {
if (!Object.prototype.hasOwnProperty.call(row, 'url')) {
throw new Error('CSV is missing the required "url" column');
}
const url = validateUrl(row.url);
page = await browser.newPage();
await page.goto(url, { waitUntil, timeout: timeoutMs });
await page.screenshot({ path: outputPath, fullPage: true });
appendResult({ row: rowNumber, url, status: 'success', output: outputPath });
} catch (error) {
appendResult({
row: rowNumber,
url: row.url ?? null,
status: 'failed',
output: null,
error: error.message,
});
} finally {
if (page) await page.close().catch(() => {});
}
}
} finally {
await browser.close();
}
}
function appendResult(result) {
fs.appendFileSync(resultsPath, `${JSON.stringify(result)}n`);
}
main().catch((error) => {
console.error(error);
process.exitCode = 1;
});Run it with:
node capture.js urls.csv screenshotsThe 30_000-millisecond timeout and networkidle2 setting are example choices, not universal recommendations. The script uses row-based paths, so rerunning it overwrites the corresponding row’s previous screenshot. The result log is also reset at the start of each run.
Choose when each page is ready
Puppeteer’s screenshot guide demonstrates navigation with waitUntil: 'networkidle2', but that is not a guarantee that every site is ready for capture. Pages may keep requests open, render important content later, or build the view client-side.
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- Use a network-idle condition when it corresponds to how the target pages load and does not wait indefinitely on persistent activity.
- For pages with a known content landmark, wait for a page-specific selector before taking the screenshot. This can be more meaningful than waiting for all network activity to quiet down.
- For content that appears after a predictable delay, a delay may be appropriate, though it can waste time on fast pages and still be too short for slow ones.
- Keep navigation and readiness timeouts finite, and log failures per row. A timeout means the script did not reach its selected condition within the configured interval; it does not prove the site is unavailable.
Choose and validate the readiness strategy against representative pages in your own CSV. The official guide documents an example, not a best setting for every website.
Choose the screenshot output
Page.screenshot() supports an output path and screenshot options. Its documented defaults are a viewport screenshot (fullPage: false) and PNG output. In the batch example, fullPage: true captures beyond the visible viewport.
| Need | Option to consider | What to know |
|---|---|---|
| Capture the visible viewport | Omit fullPage or set it to false |
This is the documented default. |
| Capture the full page | fullPage: true |
Useful for long pages; output dimensions can be much larger than a viewport image. |
| Choose image format | type |
PNG is the documented default. Supported lossy-format choices and behavior are described in the ScreenshotOptions documentation. |
| Set lossy-image quality | quality |
Quality applies to supported lossy formats, not PNG. |
| Capture a region | clip |
Specify a rectangular region rather than saving the entire page. |
| Capture a particular element | ElementHandle.screenshot() |
The Puppeteer screenshots guide documents selected-element capture. |
For the full option definitions, see the Page.screenshot() API and ScreenshotOptions interface.
Keep failures from stopping the batch
The per-row try/catch separates a bad URL or failed page from the rest of the CSV. Each result record includes a row number, input URL, status, output path on success, and error text on failure. The finally block closes the page even when navigation or screenshot capture throws; the outer finally closes the browser.
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Errors before the loop, such as an unreadable CSV or a browser that cannot launch, are job-level failures and stop processing. Check the process exit status and terminal output for those failures. The JSON Lines log is a simple implementation choice, not a batch feature built into Puppeteer.
Sequential processing, concurrency, and cost
Sequential processing is a useful first version because it keeps browser resource use and debugging straightforward. It can take longer when the CSV is large, but Puppeteer’s reviewed documentation does not publish a safe concurrency limit or throughput benchmark. If you add parallel pages, bound the number of simultaneous captures and measure runtime and resource use on representative target pages before increasing it.
Full-page screenshots and high-resolution pages can consume more memory and storage than viewport captures. Pick the format and capture area your downstream use needs; do not capture more pixels than necessary. Your local compute, browser runtime, and target-site behavior determine the practical cost and speed.
Troubleshooting
“Could not find Chrome” or a browser-launch error
puppeteer-core does not download Chrome, and some package managers block install scripts that would fetch the browser. Install compatible browser binaries with npx puppeteer browsers install, or use the full puppeteer package and verify its install step completed. Consult the installation documentation for the current setup guidance.
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A URL times out or never reaches network idle
The site may have long-lived requests, delayed content, or a navigation condition that does not match its rendering behavior. Try a page-specific selector or another appropriate readiness signal and adjust the timeout to your workload. Keep failures recorded per row rather than making one timeout halt the remaining URLs.
The screenshot is blank or missing content
The page may have captured before client-side content appeared, or the chosen condition may not represent the content you need. Wait for a meaningful selector or other page-specific readiness signal, then inspect the result on representative pages. A successful navigation alone does not establish that every desired element has rendered.
Later rows are not processed after one failure
Keep validation, navigation, and screenshot work inside the per-row try/catch. Ensure cleanup is in finally so one failed page does not leak an open page or prevent browser shutdown.
Rows are skipped, malformed, or produce odd URLs
Confirm the CSV header is exactly url, values are trimmed, and a proper parser is used for quoted fields and embedded newlines. The sample parser skips empty lines; invalid or empty URL values are logged as failed rows.
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Frequently Asked Questions
How do I take full-page screenshots?
Set fullPage: true in the options passed to page.screenshot().
How do I keep one failed URL from stopping the batch?
Handle validation, navigation, and screenshot errors inside a per-row try/catch, then close the page in finally.
Why is Puppeteer missing Chrome after install?
The browser download may not have run, or you may have installed puppeteer-core, which does not download Chrome. Use the documented browser-install command or install the full package with its install scripts enabled.
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