To capture cross-browser screenshots with LambdaTest from Node.js, send an authenticated JSON POST request to https://api.lambdatest.com/screenshots/v1/, save the returned test_id, then request that test’s details from the corresponding GET endpoint. LambdaTest’s official references document the HTTP contract; the Node.js code below is a standard fetch implementation, not a vendor-published Node.js SDK example. The documented API workflow is not described as India-specific.
What you need before making the request
- A LambdaTest account with its account username and access key. The setup guide says to retrieve these from the account dashboard and use the environment variables
LT_USERNAMEandLT_ACCESS_KEY. See LambdaTest’s credentials setup guide. - A Node.js version whose built-in
fetchis available, or an alternative HTTP client if your project’s runtime does not provide it. Check compatibility with the Node.js version used by your application. - A target page URL reachable by the screenshot service, plus a browser and operating-system configuration selected from the current supported combinations in your account or vendor documentation.
Keep the username and access key outside source control. Do not commit them, paste them into a shared screenshot or log, or expose them in client-side code.
Set credentials as environment variables
Set the variables in your shell or deployment environment, rather than embedding credentials in the script. For example, in a POSIX-compatible shell:
export LT_USERNAME='your-lambdatest-username'
export LT_ACCESS_KEY='your-lambdatest-access-key'
node capture.jsUse your organization’s secret manager or CI/CD secret settings for deployed workloads. Avoid putting real credentials directly in a command if your shell history or process environment is accessible to other users.
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Start a screenshot test from Node.js
The documented start route is POST https://api.lambdatest.com/screenshots/v1/. It uses HTTP Basic authentication and a JSON body; a successful response provides a test_id. The following complete script uses Node’s standard fetch interface to call that contract. It is an implementation example, not a Node sample published by LambdaTest. Refer to the Screenshot API reference for the current request schema.
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 configurations 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(`Screenshot API response did not include test_id: ${JSON.stringify(result)}`);
}
console.log(`Started screenshot test: ${result.test_id}`);Save this as capture.js. The example uses top-level await, so run it as an ES module—for example, use a .mjs filename or set "type": "module" in package.json—and use a Node release that supports built-in fetch. If you use CommonJS or an older runtime, adapt the module syntax or use an HTTP client available to that project.
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Choose browser and resolution settings deliberately
The request body’s url is the page to capture. The API reference also lists settings such as configs, win_res, mac_res, defer_time, email, callback_url, tunnel, and tunnel_identifier. Use the current API schema for accepted values and required relationships. The official setup examples include legacy browser versions, so do not copy them as a current compatibility matrix; check presently supported OS/browser combinations before hard-coding them.
- Use the appropriate Windows or macOS resolution field for the configuration you intend to run, and verify the resolution format against the current reference.
- Use
defer_timeonly when the target needs time to render content after navigation; a delay can add waiting time and does not guarantee that every asynchronous element has finished loading. - For a private or local target, the reference exposes tunnel-related fields, but those fields alone are not a complete tunnel setup guide. Validate the current tunnel prerequisites and configuration separately.
- If you provide a
callback_url, confirm how your service receives and validates callbacks in the current API documentation. Otherwise, retrieve test details using the test ID.
Retrieve the test status and screenshot URLs
After receiving test_id, call GET https://api.lambdatest.com/screenshots/v1/{test_id} with the same Basic authentication. The details response can include test_status and a screenshots array with browser, operating system, resolution, status, and screenshot or thumbnail URLs. See the details endpoint reference.
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const testId = result.test_id;
const detailsResponse = await fetch(
`https://api.lambdatest.com/screenshots/v1/${encodeURIComponent(testId)}`,
{
headers: {
Authorization: `Basic ${authorization}`,
Accept: 'application/json',
},
},
);
if (!detailsResponse.ok) {
throw new Error(
`Screenshot details returned HTTP ${detailsResponse.status}: ${await detailsResponse.text()}`,
);
}
const details = await detailsResponse.json();
console.log('Test status:', details.test_status);
console.log('Screenshot records:', details.screenshots);The API documentation establishes the details route but does not specify a polling interval or promise a completion time. If you need to poll, stop after a bounded number of attempts and increase the wait between requests rather than polling indefinitely. Handle a non-completed status as an in-progress result, and use a callback if that better fits your application and the current callback contract.
India-specific considerations
The documented endpoint, Basic authentication format, and environment-variable setup are presented as the general API workflow; the available official guidance does not identify a separate India endpoint, credential format, browser configuration, pricing rule, or account policy. If you are integrating from India, check that your account has access to the API and that your network egress and security policy allow the required outbound requests. Confirm current commercial terms and regional availability with your account rather than assuming a specific price or performance level.
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Troubleshoot common integration failures
- Missing credential error: Check that both
LT_USERNAMEandLT_ACCESS_KEYare set in the environment of the Node process, and that the names match exactly. - Authentication failure: Confirm that the username and access key are the values for the account, that the Basic header encodes
username:accessKey, and that no whitespace was added when storing either value. Do not print the encoded header or secrets in logs. - Non-2xx response from the start route: Read the response body for the API’s reported validation or authorization issue. Confirm the request is a JSON
POSTto the documented route, the content type isapplication/json, and the body matches the current schema. - No
test_idin the response: Do not continue to the details route with an undefined identifier. Inspect the response shape and status, then correct the rejected request or handle any response form described by the current API reference. - Invalid or unavailable browser configuration: Replace legacy sample values with combinations currently supported for your account. The API’s examples should not be treated as a live support matrix.
- Target page is inaccessible or incomplete: Check that the service can reach the URL, that it does not require a local-only network route, and that the page has enough time to render. If it is private or local, configure the currently documented tunnel workflow rather than relying only on tunnel fields in the request.
- Details do not show completed screenshots yet: Treat the status as potentially in progress, use bounded retries with backoff, or configure a callback according to the current reference. The docs do not establish a guaranteed completion time.
fetchis undefined or top-levelawaitfails: Check the Node.js release and module mode. Use a runtime with built-infetch, or use a project-compatible HTTP client and module syntax.
Or skip the browser setup
ScreenshotNeo is a website screenshot API and MCP server for developers. A single GET request can return an image or PDF; it also supports cross-browser-style viewport configuration and other capture controls. For a basic capture, the request returns the screenshot bytes directly.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://example.com -o shot.webpSee the ScreenshotNeo API documentation for request options. Cookie and consent banners, newsletter popups, and chat widgets are removed before capture; bot checks, blank pages, and failed loads are never billed. Its MCP server lets AI agents take screenshots, and the free plan includes 1,000 screenshots per month with no card required; paid plans start at $5 for 3,000 screenshots. Sign up for ScreenshotNeo’s free plan.
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How do I set up the LambdaTest Screenshot API in Node.js?
Store your account username and access key in environment variables, send an authenticated JSON POST to the documented start route, and use the returned test_id to retrieve status and screenshot records. The article’s Node.js code implements that HTTP contract with fetch.
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How do I capture cross-browser screenshots with LambdaTest from Node.js?
Include the target URL and valid browser/OS configurations in the start-test JSON body, then retrieve the test details and screenshot records with the returned test_id. Select configurations from the current supported combinations rather than legacy examples.
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