About MCP JSON-RPC Tester

Checks jsonrpc: "2.0", detects request vs response vs notification, summarizes method, id, and params, and pretty-prints the payload. Handy for crafting tools/list, tools/call, and other MCP methods before wiring a server.

How to use it

Paste a JSON-RPC message.
Click Validate, or press ⌘/Ctrl + Enter.
Fix any validation errors and copy the formatted JSON.

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