WebTransport Inspector by moqtap

Tracking since Apr 19, 2026.

Changelog

• May 18, 2026
  description

  Inspect WebTransport connections and MoQT protocol traffic right from Chrome DevTools.
  
  moqtap adds a new panel to DevTools that gives you full visibility into WebTransport sessions — whether you're debugging a media pipeline or working on MoQT protocol implementations.
  
  What it does:
  
  - Captures all WebTransport connections on a page, including those created inside Web Workers (essential for WebCodecs and MediaSession workflows)
  - Auto-detects the MoQT protocol and draft version directly from wire bytes — no configuration needed
  - Decodes MoQT control messages with full field display, so you can see subscribe requests, track info, and errors as they happen
  - Tracks active subscriptions with namespace and track name resolution
  - Shows live bitrate for each session, so you can monitor throughput at a glance
  - Includes a stream data viewer with hex and JSON modes for inspecting raw payloads
  - Detects content types automatically — fMP4 video segments, JSON control data, and raw binary
  - Adds filtering and grouping tools for tracks and streams, including namespace grouping, active-only view, and TX/RX direction filters
  - Lets you pause stream payload recording without losing control messages or track lifecycle visibility
  - Captures stack traces for outgoing control messages and unidirectional stream creation, with clickable source links in DevTools
  - Lets you export and import .moqtrace files to share debug sessions with your team
  
  Works with:
  
  - MoQT drafts 07 through 17 (auto-detected)
  - Plain WebTransport connections (non-MoQT) are displayed gracefully
  - WebTransport in Web Workers and SharedWorkers
  - High-throughput video streaming sessions (tested at 40+ Mbps)
  
  Built for developers working with WebTransport and Media over QUIC Transport. Lightweight, non-intrusive, and designed to stay out of your way on sites that don't use WebTransport.
  
  Open source: https://github.com/moqtap/extension

  Inspect WebTransport connections and MoQT protocol traffic right from Chrome DevTools.
  
  moqtap adds a new panel to DevTools that gives you full visibility into WebTransport sessions — whether you're debugging a media pipeline or working on MoQT protocol implementations.
  
  What it does:
  
  - Captures all WebTransport connections on a page, including those created inside Web Workers (essential for WebCodecs and MediaSession workflows)
  - Auto-detects the MoQT protocol and draft version directly from wire bytes — no configuration needed
  - Decodes MoQT control messages with full field display, so you can see subscribe requests, track info, and errors as they happen
  - Tracks active subscriptions with namespace and track name resolution
  - Shows live bitrate for each session, so you can monitor throughput at a glance
  - Includes a stream data viewer with hex and JSON modes for inspecting raw payloads
  - Detects content types automatically — fMP4 video segments, JSON control data, and raw binary
  - Adds filtering and grouping tools for tracks and streams, including namespace grouping, active-only view, and TX/RX direction filters
  - Lets you pause stream payload recording without losing control messages or track lifecycle visibility
  - Captures stack traces for outgoing control messages and unidirectional stream creation, with clickable source links in DevTools
  - Lets you export and import .moqtrace files to share debug sessions with your team
  
  Works with:
  
  - MoQT drafts 07 through 18 (auto-detected)
  - Plain WebTransport connections (non-MoQT) are displayed gracefully
  - WebTransport in Web Workers and SharedWorkers
  - High-throughput video streaming sessions (tested at 40+ Mbps)
  
  Built for developers working with WebTransport and Media over QUIC Transport. Lightweight, non-intrusive, and designed to stay out of your way on sites that don't use WebTransport.
  
  Open source: https://github.com/moqtap/extension

Permissions & access

Permissions

storage

Host access

None declared

Screenshots