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Open your browser’s Developer Tools, select the Network panel, and reload the page. Each row shows a request the page made; inspect its status, response, and timing to tell whether a file arrived or failed. For a code-level inventory, use the JavaScript Resource Timing API—but remember that a request entry alone does not prove the page successfully used the resource.
Inspect page requests in the browser
- Open the page in a desktop browser and open Developer Tools. In Chrome, use the Network panel.
- Select Network before reloading. Chrome records requests while DevTools is open. See Chrome DevTools Network.
- Reload the page. The request table fills with URLs requested during the load. The main HTML document normally appears first; its referenced stylesheets, scripts, images, fonts, and other resources follow. See web.dev’s critical rendering path guide.
- Use the Name and Type columns to identify what each request is for. Select a row to inspect its headers, preview or response, and timing information.
- Read Status and the response details together. A successful status with a usable response is stronger evidence of delivery than a row alone. An HTTP error, blocked request, failed status, or empty/error response can explain a missing asset.
- Check the Waterfall to see when requests ran and how long they took. Longer bars indicate more time; overlapping bars show requests that ran concurrently. The Timing view can break a request into phases such as DNS lookup, connection, request, and response where details are available. See Chrome’s Network panel reference.
A request row is evidence that the browser attempted a request. It does not, by itself, prove that the bytes arrived intact or were successfully used in the rendered page. Pair the Network evidence with what you see on the page and relevant Console errors.
Find requests that happen after the initial load
A reload captures activity triggered by the initial page load, not necessarily every request the page can make. Images may be lazy-loaded, and scripts may wait for a click, form submission, scroll, or another interaction before requesting more data. Some requests begin well after the first load. The web.dev guide notes that deferred activity may depend on a sequence of user interactions.
- Start recording in Network and reload the page.
- Wait for the initial activity to settle, then reproduce the behavior you are investigating: scroll to the relevant area, open a menu, click a control, or submit a form.
- Watch for new rows and inspect their initiators, status, response, and timing just as you would for initial requests.
- If the behavior is intermittent, repeat the same interaction sequence and compare the requests and outcomes.
For a cache-independent check in Chrome, open the reload control’s menu and choose Empty Cache and Hard Reload. A normal reload may reuse cached resources; the hard reload helps test fresh fetching. See Chrome’s Network panel reference. Browser labels and menus can change, so use the equivalent reload option if your version presents it differently.
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Read failures without mistaking them for missing requests
When an image, script, stylesheet, or API result is absent, first establish whether a request was attempted. If it appears in Network, the URL, status, response, and timing narrow down what happened. If it does not appear, the page may not have triggered it yet, or the request may be initiated only under a condition you have not reproduced.
- HTTP error or failed status: Open the request and examine its response and headers. This indicates an unsuccessful or problematic fetch, not simply an asset that has not yet appeared.
- Blocked request: Inspect the browser’s blocked reason or related Console message. The request was attempted, but the browser did not allow it to complete normally.
- Unexpectedly fast or absent network transfer: Consider whether the browser served a cached resource. Use Empty Cache and Hard Reload in Chrome when you need to test fresh fetching.
- Request appears successful but content is missing: Check the response or preview and the Console. A request entry does not establish that the page rendered or used the returned bytes correctly.
- No request after reload: Reproduce relevant interactions and wait for deferred work before concluding that the page never requested the resource.
List resources with JavaScript
The Resource Timing API exposes resource entries through the Performance API. MDN describes each document resource as represented by a PerformanceResourceTiming entry, which extends PerformanceEntry. Run this in the page’s Console after it has run to list entries currently available:
const resources = performance.getEntriesByType('resource');
for (const r of resources) {
console.log({
name: r.name,
initiatorType: r.initiatorType,
start: r.startTime,
duration: r.duration,
transferSize: r.transferSize,
encodedBodySize: r.encodedBodySize,
decodedBodySize: r.decodedBodySize
});
}name identifies the resource URL; initiatorType indicates the kind of initiator; startTime and duration provide timing; and the size fields report transfer and body-size information when available. These entries are useful for scriptable logging or automated checks, but they do not replace Network when you need to inspect response headers, previews, or a browser’s failure details. See MDN’s PerformanceResourceTiming reference.
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Observe entries as they are added
Use a PerformanceObserver when you want to react to resource entries as they arrive rather than take a one-time snapshot. This example logs new entries and is suitable for running early in the page lifecycle:
const observer = new PerformanceObserver((list) => {
for (const r of list.getEntries()) {
console.log({
name: r.name,
initiatorType: r.initiatorType,
start: r.startTime,
duration: r.duration,
transferSize: r.transferSize,
encodedBodySize: r.encodedBodySize,
decodedBodySize: r.decodedBodySize
});
}
});
observer.observe({ type: 'resource', buffered: true });The buffered option lets the observer receive entries already recorded as well as newly added ones. Resource Timing has a finite buffer; MDN documents the resourcetimingbufferfull event for detecting when it fills. If collecting many entries, handle that event and consider clearing or otherwise managing the buffer as appropriate for your page. See MDN’s PerformanceResourceTiming reference.
Understand what Resource Timing cannot tell you
Cross-origin timing details may be hidden
For resources from another origin, several detailed timing fields return zero by default unless the resource permits timing access. MDN specifically lists redirectStart, redirectEnd, domainLookupStart, domainLookupEnd, connectStart, connectEnd, secureConnectionStart, requestStart, and responseStart. A zero in one of these fields can therefore mean the browser withheld cross-origin timing detail; it does not necessarily mean that no request occurred. See MDN’s PerformanceResourceTiming reference.
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Entries show fetch activity, not successful use
Resource Timing gives a timeline and size data for network events, but an entry alone is not a full verdict on whether the response was usable or rendered. Confirm a suspected failure in Network by checking status and response, and correlate it with the page’s visible behavior and Console errors.
Choose the right method for the question
| Need | Best fit | What it provides |
|---|---|---|
| See URLs and diagnose one page interactively | Developer Tools Network | Request rows, status, headers, previews or responses, and a waterfall. |
| Record or process resource entries in code | Resource Timing API | Scriptable entries with timing and size fields; some detailed cross-origin values can be zero by default. |
| Find requests triggered by user behavior | Network plus interaction reproduction, or an observer running on the page | Captures activity only after the relevant scroll, click, form submission, or other trigger occurs. |
| Check whether cached resources affect a test | Chrome Empty Cache and Hard Reload | A more cache-independent fresh-fetch check than a normal reload. |
Troubleshooting common checks
The request table is empty
Select Network before reloading, then reload while Developer Tools is open. Chrome records requests with DevTools open. If the table remains empty, verify that the page actually loaded in that tab and that recording is active.
The resource is missing from the first load
It may be lazy-loaded or interaction-triggered. Scroll to its location, open the relevant control, or submit the form that should request it, while Network is recording.
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The request looks successful but the page is still broken
Inspect the response or preview and check the Console for errors. Request activity is not proof that the browser could use the content as intended.
Timing fields are zero in JavaScript
For cross-origin resources, detailed Resource Timing fields can be restricted unless timing access is allowed. Compare with Network and avoid interpreting those zeros as proof of no request.
Results differ between reloads
A normal reload can use the cache. Repeat with Chrome’s Empty Cache and Hard Reload if you need to compare fresh fetch behavior.
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Or skip the browser setup
If your goal is to obtain a screenshot rather than inspect a page’s request diagnostics, ScreenshotNeo can capture a URL with one GET request. It is a screenshot API and MCP server for developers; it does not replace the Network panel or Resource Timing when you need request-level evidence. Before capture, it accepts cookie/consent banners like a visitor and removes 60+ known consent platforms, newsletter popups, and chat widgets; each of those steps can be turned off. Bot checks/CAPTCHAs, blank pages, timeouts, failed loads, and cache hits cost nothing, and each response reports the page verdict and billing status in headers. Its MCP server provides take_screenshot, get_page_info, and capture_pdf for AI agents, including Claude, Cursor, and other MCP clients. The free plan includes 1,000 shots a month with no card; paid plans start at $5 for 3,000 shots.
Example cURL request (replace the target URL as needed):
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpSee the ScreenshotNeo documentation for API options. Sign up free for 1,000 screenshots a month with no card.
Frequently Asked Questions
Does a Network row prove that a resource loaded successfully?
No. It proves a request attempt; inspect status and response, then confirm the page used the resource as expected.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
Why are some Resource Timing values zero for a third-party URL?
The browser may withhold detailed cross-origin timing values unless timing access is permitted.
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