Network DebuggerSee Every Byte Your App Sends

HTTP, WebSocket & Socket.IO inspector for Dart and Flutter — with waterfall timeline, scripting, breakpoints, and more

Quick Start

API Reference

GitHub

🔍

HTTP Inspection

See headers, body, timing and status for every request. Filter by method, status code, or URL pattern.

🌊

Waterfall Timeline

Visual breakdown of DNS, TLS, waiting and transfer time for each request — spot bottlenecks instantly.

🔌

WebSocket & Socket.IO

Full message history for persistent connections. Inspect frames, events, and binary payloads in real time.

⏱️

Throttling & Latency

Simulate slow networks, high latency, or dropped packets to test how your app handles poor connectivity.

🛑

Breakpoints

Pause any request mid-flight, inspect or modify it, then let it continue. Debug tricky API issues on the fly.

📝

Scripting

Write rules in Dart, Go, Rust, JS, or Python to rewrite requests, mock responses, or inject headers automatically.

🖥️

Cross-Platform

Desktop app for macOS, Windows, Linux. CLI mode for CI pipelines and headless environments. Web UI included.

🔥

Firebase RTDB

Monitor Firebase Realtime Database reads, writes and listeners — see exactly what data flows through your app.

Packages

Package	What it does
`network_debugger`	CLI launcher — starts the proxy and opens the UI
`dio_debugger`	Attaches the proxy to a Dio HTTP client
`http_debugger`	Global HTTP interception via `HttpOverrides`
`web_socket_debugger`	Intercepts `dart:io` WebSocket connections
`web_socket_channel_debugger`	Intercepts `package:web_socket_channel`
`socket_io_debugger`	Captures Socket.IO events and payloads
`firebase_database_debugger`	Tracks Firebase Realtime Database operations
`hex_viewer`	Flutter widget for viewing binary data in HEX

Quick Setup

InstallDioHttpOverrides

bash

dart pub global activate network_debugger
network_debugger

dart

import 'package:dio_debugger/dio_debugger.dart';

final dio = Dio()..interceptors.add(DioDebugger());