WebSocket & JSON-RPC Frame Inspector

Build and inspect WebSocket JSON-RPC 2.0 frames, payloads, and client connection snippets.

WebSocket & JSON-RPC Frame Inspector

Construct, validate, and simulate JSON-RPC 2.0 WebSocket messages and client connection scripts.

WebSocket Endpoint URL (WSS / WS)

Frame Structure

Method Name

Params Array / Object (JSON)

RFC 6455 Opcode Reference

0x1: Text Frame

0x2: Binary Frame

0x8: Connection Close

0x9: Ping Frame

WebSocket Message Frame (JSON)

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "eth_blockNumber",
  "params": []
}

Browser JavaScript Client Script

const ws = new WebSocket("wss://echo.websocket.events");

ws.onopen = () => {
  console.log("Connected to WebSocket");
  ws.send("{  \"jsonrpc\": \"2.0\",  \"id\": 1,  \"method\": \"eth_blockNumber\",  \"params\": []}");
};

ws.onmessage = (event) => {
  console.log("Message received:", JSON.parse(event.data));
};

ws.onerror = (err) => console.error("WebSocket error:", err);
ws.onclose = () => console.log("WebSocket closed");

About This Tool

WebSocket Frame Analyzer assists in formatting and validating WebSocket JSON-RPC 2.0 communication, providing payload builders and ready-to-run JavaScript browser client scripts.

Key Features

JSON-RPC 2.0 message builder with automatic ID generation

Browser WebSocket connection script generator

RFC 6455 opcode reference table

How to Use

1Specify your WebSocket endpoint URL (wss:// or ws://).
2Enter the JSON-RPC method and params, or supply a custom JSON payload.
3Copy the formatted WebSocket message or browser client connection script.

Why Use ToolSnippet WebSocket & JSON-RPC Frame Inspector?

Streamlines real-time WebSocket debugging for Ethereum nodes, crypto feeds, and chat protocols.

Includes RFC 6455 opcode reference guide.

Tips for Best Results

Always use wss:// (WebSocket Secure) in production to ensure end-to-end TLS encryption

Frequently Asked Questions

What is JSON-RPC 2.0 over WebSocket?

JSON-RPC 2.0 is a stateless, lightweight remote procedure call specification that uses WebSocket channels for bidirectional message exchange.

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