MoQT debugging tools — multi-draft, multi-platform

See inside MoQT

The protocol debugger for Media over QUIC Transport. Connect to any relay, inspect every message, understand what's really happening.

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moqtap session — relay.example.com
$ moqtap connect https://relay.example.com/moq
Connecting via WebTransport...
TX CLIENT_SETUP versions=[0xff00000e] path=/moq
RX SERVER_SETUP version=0xff00000e impl="moq-rs/0.5"
Session established (draft-14)
TX SUBSCRIBE ns=["chat"] track="messages" filter=latest_object
RX SUBSCRIBE_OK id=0 largest=(42,7)
RX object group=43 obj=0 size=256B {"author":"alice","msg":"hello!"}
_

Everything you need to debug MoQT

No more reading raw byte logs or adding println! to Rust code.

Connect to any relay

Native QUIC and WebTransport. Accept self-signed certs, provide custom CAs, or use system trust. Any draft version.

Inspect every message

Full control stream log with parsed fields, raw hex, timestamps, and direction. Filter by message type.

Subscribe & fetch

Send SUBSCRIBE, FETCH, discover namespaces interactively. Watch the full request/response lifecycle.

View objects

Auto-detect and render text, JSON, and binary payloads. Hex viewer for raw bytes with ASCII sidebar.

QUIC transport stats

Real-time RTT, packet loss, congestion window, bytes sent/received, and stream counts from quinn.

Export traces

Save sessions as .moqtrace files (JSON-lines, gzip). Share with your team, load for offline analysis.

How it works

Three steps to protocol visibility.

1

Enter a relay URL

Point moqtap at any MoQT relay — WebTransport or native QUIC. Configure TLS as needed.

2

moqtap connects via QUIC

Establishes a session, negotiates draft version, exchanges CLIENT_SETUP / SERVER_SETUP.

3

See every message

Every control message, every object, every QUIC stat — parsed, timestamped, and searchable.

A suite of tools, not just one

Desktop, CLI, and browser tools for MoQT protocol debugging.

Desktop Free

Connect to any MoQT relay, inspect control messages, subscribe to tracks, fetch data, and view objects in real-time.

  • Client mode
  • Full message inspector
  • Object viewer
  • Trace export
  • QUIC stats
CLI Free

MoQT client and transparent intercepting proxy. Connect to relays or sit between your client and relay — scriptable and automatable.

  • Client & proxy modes
  • Live frame decoding
  • Session recording
  • JSON output
  • WebTransport support
Browser Extension Free

WebTransport Inspector for Chrome and Firefox DevTools. See every MoQT connection, decode control messages, track subscriptions, inspect streams and datagrams, and detect media formats — without leaving the browser.

  • Live WebTransport connections
  • Track subscription tracking
  • Stream & datagram inspector
  • ISO BMFF / CBOR / MessagePack detection
  • Trace export (.moqtrace)

Built on open source libraries

The protocol core is MIT-licensed. Rust crates and npm packages you can use in your own projects.

View on GitHub

Rust crates

moqtap-codec

Zero-dependency wire codec for drafts 07–17.
moqtap-client

Outbound QUIC/WebTransport MoQT client.
moqtap-proxy

Transparent intercepting proxy framework.
moqtap-trace

.moqtrace file format reader and writer.

npm packages

moqtap

CLI package. MoQT client and intercepting proxy.
@moqtap/codec

MoQT message encoding/decoding. Supports drafts 07–17.
@moqtap/trace

Read and write .moqtrace session recordings.
@moqtap/test-vectors

Language-agnostic codec test vectors for validation.

Start debugging MoQT today

Free and open source. Download the desktop app or explore the Rust crates.

Download moqtap Star on GitHub