WebSocket & SSE Live Stream Inspector
Connect to real-time WebSockets (ws://, wss://) and Server-Sent Events (EventSource), inspect bidirectional traffic frames, send custom JSON payloads, and test heartbeat pings directly in your browser.
The WebSocket & SSE Live Stream Inspector is a fast, accurate Developer Tools utility designed to connect to real-time websockets (ws://, wss://) and server-sent events (eventsource), inspect bidirectional traffic frames, send custom json payloads, and test heartbeat pings directly in your browser. entirely in your browser with zero server data storage.
WebSocket & SSE Live Stream Inspector
Connect to real-time WebSockets (ws://, wss://) and Server-Sent Events (EventSource), inspect bidirectional traffic frames, and test heartbeat pings.
Payload Composer
Live Traffic Stream (0)
DISCONNECTEDNo stream messages yet. Click Connect to initiate live traffic.
Real-Time Streaming Protocols: WebSocket RFC 6455 & EventSource Architecture
Building responsive interactive web applications requires real-time data synchronization. Understanding the operational differences between WebSockets and Server-Sent Events is essential for choosing the right transport architecture.
Protocol Characteristics Comparison
- WebSocket (RFC 6455): Upgrades an HTTP connection via
Upgrade: websocketheader. Operates over TCP with custom binary framing (FIN, Opcode, Masking key, Payload length). Ideal for chats, multiplayer gaming, and financial order books. - Server-Sent Events (W3C EventSource): Operates over standard HTTP/1.1 or HTTP/2 using MIME type
text/event-stream. Includes automatic reconnection, event IDs, and custom event names. Ideal for live stock tickers, AI LLM token streaming, and notifications.
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Systems & Security Engineers • Applied Cryptography & High-Performance Web Tools
How to Use WebSocket & SSE Live Stream Inspector
Choose Protocol & Endpoint
Select WebSocket (WS/WSS) or Server-Sent Events (SSE) and enter your server URL (e.g. wss://echo.websocket.org).
Connect to Stream
Click "Connect" to establish a live bidirectional full-duplex socket or EventSource stream directly from your browser.
Send Custom Payloads
Compose text or JSON messages in the Payload Composer and click "Send Message", or toggle "Auto-Ping (5s)" for heartbeats.
Inspect & Export Traffic
Review real-time incoming and outgoing frames with timestamp badges, filter messages with text search, and export the log as JSON.
Practical Examples & Conversions
wss://echo.websocket.org, Payload: { "action": "ping" }Real-time response frame returned with server timestamp
Frequently Asked Questions (PAA)
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Authoritative Standards & Citations
Calculations and algorithms on this page are implemented and verified in strict accordance with the following official technical specifications:
RFC 7519: JSON Web Token (JWT)
Standardized compact, URL-safe means of representing claims to be transferred between two parties.
Web Cryptography API Specification
Standard JavaScript API for performing basic cryptographic operations in web applications.
RFC 4122: A Universally Unique IDentifier (UUID) URN Namespace
Definition of uniform format and generation algorithms for UUIDs.