Free — Chrome extension

WebTransport Inspector

Debug MoQT right in Chrome DevTools. Monitor WebTransport connections, decode control messages, inspect streams, and view payloads — without leaving the browser.

Chrome Web Store — coming soon Read the docs

Browser-native MoQT debugging

Everything you need to understand MoQT traffic in your web application, built into Chrome DevTools.

Live WebTransport connections

Monitor all WebTransport connections in the current page. See real-time bitrate per connection and connection lifecycle events.

Control message decoding

Automatically decode MoQT control messages — setup, subscriptions, publishes, fetches, and goaways. See parsed fields alongside raw bytes.

Stream & object inspector

Inspect individual QUIC streams and MoQT objects. Live byte counts, stream state, and object metadata in a structured tree view.

Payload inspection

Auto-detect payload format and render appropriately: JSON with syntax highlighting, fMP4 with protocol header highlighting, or binary with hex viewer.

Trace export & import

Export sessions as .moqtrace files for offline analysis or sharing. Import traces from colleagues or from the moqtap Desktop app.

Persistent preferences

Column widths, filters, expanded sections — your layout preferences are saved across DevTools sessions.

Browser extension vs Desktop

WebTransport Inspector

Free

  • WebTransport connections in Chrome
  • Quick in-browser debugging
  • No installation beyond Chrome
  • Trace export compatible with Desktop

moqtap Desktop

Free

  • Native QUIC + WebTransport
  • Full QUIC transport stats
  • Active subscribe, fetch, and discovery
  • Pro upgrade available

Related use cases

Debug MoQT sessions

See inside the protocol when building MoQT-powered web applications.

Frequently asked questions

What is the WebTransport Inspector?
The WebTransport Inspector is a free Chrome DevTools extension that lets you inspect MoQT connections running over WebTransport directly in your browser. It decodes control messages, monitors streams, inspects payloads, and exports traces — without leaving DevTools.
Does it work with any MoQT implementation?
Yes. The WebTransport Inspector works with any WebTransport-based MoQT implementation. It intercepts WebTransport connections at the browser level and decodes MoQT messages regardless of the library or framework used.
Is the browser extension free?
Yes, the WebTransport Inspector is completely free. It's designed to complement the moqtap Desktop app — use the extension for quick in-browser debugging and Desktop for deeper analysis with native QUIC support.
Does it support native QUIC connections?
No. The browser extension only sees WebTransport connections (which run over HTTP/3 and QUIC). For native QUIC debugging, use moqtap Desktop, which connects directly using the quinn QUIC implementation.
Can I use it alongside moqtap Desktop?
Yes. Both tools export and import the same .moqtrace file format. You can capture a trace in the browser extension and open it in Desktop for deeper analysis, or vice versa.
What browsers are supported?
The WebTransport Inspector is a Chrome DevTools extension and works in Chrome and Chromium-based browsers that support the WebTransport API.

Debug MoQT in your browser

The WebTransport Inspector is free. For native QUIC support and advanced features, try moqtap Desktop.

Download Desktop