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To start a LambdaTest screenshot test from Node.js, send an authenticated JSON POST request to https://api.lambdatest.com/screenshots/v1/, then use the returned test_id to retrieve its status and screenshot records. The API workflow is the same for Indian developers; the official documentation reviewed does not describe a separate India-specific endpoint or credential format.
What you need before making the request
- A LambdaTest account with its username and access key. LambdaTest’s setup guide says to find these in the account dashboard and expose them as
LT_USERNAMEandLT_ACCESS_KEYenvironment variables: Using environment variables for authentication credentials. - A Node.js version whose built-in
fetchis available, or an alternative fetch implementation supported by your project. The JavaScript below is an implementation of the documented HTTP API, not a Node.js SDK sample published by the vendor. - A target URL reachable by the screenshot service. For private or local pages, the API reference includes tunnel-related fields, but tunnel setup requires separate verification against current documentation.
Keep credentials in environment variables or a secrets manager, not in committed source code, screenshots, logs, or shared shell history. For example, set the variables in your local development environment or CI secret store; do not replace them with real values in the code.
Start a screenshot test from Node.js
LambdaTest (now TestMu AI, as reflected in its official documentation) documents the screenshot endpoint as POST https://api.lambdatest.com/screenshots/v1/. It uses HTTP Basic authentication, with the account username and access key as the credential pair, and accepts a JSON request body. A successful start response returns a test_id. See the Start Screenshot Test API reference.
Save this as an ES module file such as start-screenshot.mjs, then run it with environment variables set:
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const username = process.env.LT_USERNAME;
const accessKey = process.env.LT_ACCESS_KEY;
if (!username || !accessKey) {
throw new Error('Set LT_USERNAME and LT_ACCESS_KEY');
}
const authorization = Buffer.from(`${username}:${accessKey}`).toString('base64');
const response = await fetch('https://api.lambdatest.com/screenshots/v1/', {
method: 'POST',
headers: {
Authorization: `Basic ${authorization}`,
'Content-Type': 'application/json',
Accept: 'application/json',
},
body: JSON.stringify({
url: 'https://example.com',
defer_time: 0,
email: false,
win_res: '1366x768',
configs: [
// Add browser/OS/version combinations supported by your current account.
],
}),
});
if (!response.ok) {
throw new Error(
`Screenshot API returned HTTP ${response.status}: ${await response.text()}`,
);
}
const result = await response.json();
if (!result.test_id) {
throw new Error(`Response did not include test_id: ${JSON.stringify(result)}`);
}
console.log('Screenshot test ID:', result.test_id);The API reference documents configs as an object; check its current schema and supply the browser/OS configuration in the format presently required by your account. The sample above deliberately does not hard-code a legacy browser version. Set the URL to the page you want to capture, and use the current API reference to validate the accepted values before running a production integration.
Retrieve status and screenshot URLs
After starting a test, request GET https://api.lambdatest.com/screenshots/v1/{test_id} with the same Basic authentication. The documented response includes test_status and a screenshots array. Screenshot records can include operating system, browser and version, status, resolution, screenshot and thumbnail URLs, and an activity ID. See the Fetch specified screenshot details reference.
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async function getScreenshotDetails(testId, authorization) {
const response = await fetch(
`https://api.lambdatest.com/screenshots/v1/${encodeURIComponent(testId)}`,
{
headers: {
Authorization: `Basic ${authorization}`,
Accept: 'application/json',
},
},
);
if (!response.ok) {
throw new Error(`Screenshot details returned HTTP ${response.status}: ${await response.text()}`);
}
return response.json();
}
const details = await getScreenshotDetails(result.test_id, authorization);
console.log('Status:', details.test_status);
console.log('Screenshots:', details.screenshots);The documentation does not prescribe a polling interval or guarantee a completion time. If your application must wait for completion, use bounded retries with a delay that increases between requests, stop once the status is complete or failed, and impose an overall deadline. A callback URL is also among the documented request fields; use it if your integration is designed to receive asynchronous notifications, and verify its current behavior and payload in the API reference.
Choose request fields and browser configurations
The reference lists url, defer_time, email, mac_res, win_res, tunnel, tunnel_identifier, username, password, callback_url, and configs. Confirm the current schema before relying on less-common fields; availability and accepted values may vary as the service evolves.
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- URL and browser coverage: choose the target page and the browser/OS/version combinations you need. Fetch the current supported combinations from the vendor’s current documentation or account tools. Older examples in vendor material are not a current support matrix.
- Resolution: the reference exposes separate Mac and Windows resolution fields. Select the one appropriate to the configurations being requested and verify accepted resolution values in the current docs.
- Deferred capture:
defer_timeis available when the page needs time before capture. Choose a value based on the page behavior rather than assuming a fixed wait guarantees all asynchronous content has loaded. - Notifications:
emailandcallback_urlare documented options. Use only the notification method your workflow needs. - Private pages: tunnel-related fields are documented, but they are not a complete local-testing recipe by themselves. Follow the current tunnel setup instructions before sending private URLs.
The broader API reference also lists related operations for browser/OS combinations, devices, resolutions, locations, and managing tests. The older Falcon reference can corroborate the broad API shape, but should not be treated as proof that every old option remains available: LambdaTest API documentation.
India-specific considerations
The documented endpoint and credential flow are generic; the official sources reviewed do not establish a separate India API route, localized pricing, India-only browser settings, or regional performance guarantees. If you are integrating from India, check that your account has API access and that your organization’s network egress and security policies allow the requests. Confirm current commercial terms and availability in your own account rather than inferring them from location.
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Troubleshoot common integration failures
- Missing environment-variable error: the process cannot see
LT_USERNAMEorLT_ACCESS_KEY. Set both in the environment used to launch Node.js or in the CI secret configuration, then restart the process. - HTTP authentication failure: confirm the username and access key are the dashboard values, and that the header is exactly
Authorization: Basic base64(username:accessKey). Do not include a newline or extra spaces when constructing the credential pair. - Request rejected: verify the endpoint, JSON syntax, content type, and field names. Check current schema requirements for
configsand resolution values rather than copying dated browser combinations. - No
test_idin the start response: inspect the response body and status before treating the request as accepted. The example throws on HTTP errors and checks that the identifier exists. - Details request fails: ensure the ID is URL-encoded, the Basic header is sent again, and the ID came from a successful start response.
- Screenshot is missing or still pending: a start response is not the screenshot itself. Retrieve details and handle non-completed states with bounded retries or a callback workflow; the docs do not specify a universal wait time.
- Private target cannot load: a public endpoint cannot necessarily reach an internal host. Review current tunnel requirements and ensure the target is accessible through the configured tunnel.
fetchis undefined: use a Node.js release with built-in fetch or install and configure a compatible fetch library for your project.
Or skip the browser setup
If your task is simply to get a clean screenshot from a URL, ScreenshotNeo provides a one-request alternative. Its API accepts a URL and can return PNG, JPEG, WebP, or PDF; it is not a LambdaTest browser/OS matrix replacement. Example Node.js call:
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://example.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);
if (!res.ok) throw new Error(`ScreenshotNeo returned HTTP ${res.status}`);
const image = Buffer.from(await res.arrayBuffer());
await import('node:fs/promises').then(fs => fs.writeFile('shot.webp', image));See the ScreenshotNeo API documentation for request options and response behavior. Cookie and consent banners are accepted or removed before capture, along with known newsletter popups and chat widgets; those steps can be turned off. Bot checks, blank pages, timeouts, failed loads, and cache hits are not billed, and response headers indicate the page verdict and billing status. Its MCP server offers take_screenshot, get_page_info, and capture_pdf tools for AI agents. The free plan includes 1,000 shots per month without a card; paid plans start at $5 for 3,000 shots. Sign up for ScreenshotNeo’s free plan.
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How do I capture cross-browser screenshots with LambdaTest from Node.js?
Start a test with the documented POST endpoint and a current, supported browser/OS configuration in the JSON body, then retrieve its records from the details endpoint using the returned test ID.
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Is there a separate LambdaTest Screenshot API endpoint for Indian developers?
The official material reviewed documents the general endpoint and credential flow, not a separate India-specific API workflow.
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