WebSocket
A computer communications protocol, providing full-duplex communication channels over a single TCP connection, ideal for real-time applications like chat and live updates.
WebSocket & SSE Tester
Test WebSocket (ws/wss) and Server-Sent Events (SSE) streams directly in your browser. Real-time JSON parsing, auto-scrolling event feeds, and zero-knowledge privacy.
Protocols: WebSocket (ws/wss), Server-Sent Events (http/https) Data Formats: Auto-JSON detection & formatting Privacy: 100% Client-Side. No server proxies. Logging: Timestamped feed with Syntax Highlighting
Last updated
WebSocket & SSE Tester is a free, browser-based tool from UseToolSuite's Network & API Tools collection. All processing happens locally on your device — your data is never uploaded to any server. Use the tool below, then scroll down for detailed documentation, frequently asked questions, and related resources.
Advertisement
Disconnected
Logs will appear here once connected...
WebSocket & SSE Stream Tester
A unified, real-time debugging interface for persistent connections. Whether you are connecting to a bi-directional WebSocket or subscribing to a unidirectional EventSource (Server-Sent Events), this tool establishes a live connection entirely within your browser.
Zero-Knowledge Architecture
Your connections are established directly from your local browser environment to the target server. There is no intermediate proxy or backend logging your events, payloads, or IP. This ensures absolute privacy for testing authenticated streams and internal network endpoints.
How to Use This Tool
- 1
Enter Endpoint
Paste your WebSocket (wss://) or EventSource (https://) stream URL.
- 2
Connect
Click Connect to establish a live connection directly from your browser.
- 3
Interact
Send JSON payloads and monitor the incoming real-time stream logs.
How helpful was this tool?
Click to rate
Help us improve!
Sorry it didn't meet your expectations. We're always looking to make these tools better. What was missing or broken?
Open GitHub Issue Advertisement
Key Concepts
Essential terms and definitions related to WebSocket & SSE Tester.
Server-Sent Events (SSE)
A standard describing how servers can initiate data transmission towards clients once an initial client connection has been established. Unlike WebSockets, SSE is unidirectional (server to client).
Frequently Asked Questions
What protocols does this tool support?
The tool supports both bi-directional WebSockets (ws://, wss://) and uni-directional Server-Sent Events/EventSource (http://, https://) connections.
Is my stream data logged on your servers?
No. The connection is established directly from your browser to your target server. We do not proxy, log, or inspect any of the payloads. It is 100% zero-knowledge.
Does it support authenticated streams?
Yes, if your authentication relies on query parameters (e.g. ?token=XYZ). However, custom headers cannot be set for native WebSocket connections in the browser.
Troubleshooting & Technical Tips
Common errors developers encounter and how to resolve them.
Connection Refused / Failed to Connect
Ensure the endpoint is publicly accessible or reachable from your current network. Check if the server requires specific Origin headers or blocks browser connections via CORS.
Cannot set custom headers
The native browser WebSocket API does not allow setting custom HTTP headers (like Authorization). Use query parameters for token authentication.
Advertisement