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How Puppeteer frames work
Puppeteer’s Frame represents a DOM frame, such as an <iframe>. Each frame has its own document context. A selector or evaluation performed in the main frame does not automatically search the documents of its child frames, and evaluation in a frame does not cross into its own child frames.
A page exposes the frame hierarchy through page.mainFrame() and each frame’s childFrames(). Use page.frames() when you need an array of all currently attached frames. The tree can change as a page loads or rerenders, so avoid relying on a frame’s position in that array. Puppeteer Frame class reference and Page class reference describe these APIs.
Find the intended frame
Inspect the current frame tree
When you are unsure where a document lives, print the frame URLs recursively. This reveals nested frames as well as direct children of the main frame.
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function dumpFrameTree(frame, indent = '') {
console.log(indent + frame.url());
for (const child of frame.childFrames()) {
dumpFrameTree(child, indent + ' ');
}
}
dumpFrameTree(page.mainFrame());Wait for a frame that appears asynchronously
If the target iframe is inserted after the page loads, use page.waitForFrame() with a predicate. The predicate can inspect the embedding element through frame.frameElement(). This example matches its name attribute:
const frame = await page.waitForFrame(async frame => {
const element = await frame.frameElement();
if (!element) return false;
return await element.evaluate(el => el.getAttribute('name') === 'checkout');
});If names or other attributes are mutable or non-unique, combine a stable property of the embedding element with an appropriate URL condition. Puppeteer documents waitForFrame() for waiting on a frame matching a URL or predicate: Page.waitForFrame().
Choose a stable identity, not an array index
A frame’s URL is useful when it uniquely identifies the target, while an attribute on the embedding element can distinguish otherwise similar frames. If neither alone is reliable, use both. The frame tree can gain, lose, or reorder entries as the page changes; reacquire the target by its identifying conditions rather than assuming it will remain at a particular index.
Interact inside the frame
Once you have the correct Frame, use its own locator, selector, or evaluation methods. For example:
await frame.locator('button[type="submit"]').click();Frame.locator() scopes the locator to that frame. Puppeteer locators support CSS selectors and Puppeteer-specific selector syntax, including text, accessibility role and name, XPath, and combinations across shadow roots. Locators can retry actions while checking documented preconditions. See Frame.locator() and Locator behavior.
For lower-level operations, frame.$() returns the first matching element handle or null, frame.$eval() runs a function on the first matching element, and frame.evaluate() runs code in that frame’s context. Prefer locators for user-like interactions; use explicit frame methods when you need page data or element handles. The available frame methods are documented in the Frame class reference.
Nested iframes
If the target is inside a nested iframe, first identify the containing frame, then inspect its childFrames() and select the nested frame. Repeat for each level. A selector run in the parent frame will not find an element in a child frame’s separate document.
Wait for content or navigation
Wait for a meaningful element
Use frame.waitForSelector() when the goal is for a particular element to appear in that frame. It is documented to work across navigations and throws if the selector does not appear within the configured wait conditions. See Frame.waitForSelector().
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await frame.waitForSelector('form.checkout');
await frame.locator('button[type="submit"]').click();Prefer a condition tied to the task—such as a form or confirmation element—over an arbitrary sleep. A selector wait establishes that the element appeared; application-specific readiness may require a more meaningful state or element.
Pair navigation waits with the action
If an action should navigate the frame, start waiting before you trigger it. Await both operations together:
const [response] = await Promise.all([
frame.waitForNavigation(),
frame.click('a.continue'),
]);This avoids missing a fast navigation that begins before a later wait is attached. The navigation result is the main resource response, but can be null for navigation to about:blank or a same-URL hash change. Puppeteer also treats History API URL changes as navigation. See Frame.waitForNavigation().
Use waitForNavigation() when the frame’s document or URL is expected to change; use waitForSelector() when the requirement is that content appears. A selector can appear without a document navigation, so choose the wait that corresponds to the outcome you need.
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Handle frame removal and replacement
Frames can be attached, navigated, and detached during a page’s lifecycle. A web app may replace an iframe during an update, making a previously stored frame reference stale. Check the frame’s detached state when diagnosing this situation, then inspect the current tree or wait for the target frame again. Puppeteer documents the lifecycle and frame state in its Frame class reference.
Troubleshooting
“The selector is not found,” but it is visible in the browser
The element may be inside an iframe, while your query targets the main document. Inspect page.frames() or dump the tree, identify the containing frame, and run the selector on that Frame.
The selected frame is the wrong one
Do not select by array index. Match a stable URL, an embedding-element attribute through frame.frameElement(), or a combination of both. If multiple nested frames are present, inspect the hierarchy rather than assuming the target is a direct child.
The frame or its content is not ready
If the iframe is created asynchronously, wait with page.waitForFrame(). If the frame exists but its target content is still loading, use frame.waitForSelector() for the element your next action requires. Set suitable wait options for the application rather than adding an unexplained fixed delay.
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Attach the wait before the triggering action using Promise.all(). Also verify that the action actually navigates the frame: if it only reveals content within the existing document, wait for that content with waitForSelector() instead.
Actions fail after an application update
The iframe may have been detached and recreated. Reacquire it from the current page state, then wait for the required element before acting; do not assume an old frame reference remains valid indefinitely.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Version and API compatibility
Puppeteer’s official API pages cited here label the Frame and Page references version 25.12.0, waitForFrame() and Frame.locator() version 25.9.0, and waitForSelector() version 25.10.0. These are documentation labels, not a guarantee that every method exists in older installed releases. Check the reference for the Puppeteer version used by your project before copying an example.
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