Validate JSON-RPC messages used by MCP clients and servers, including requests, notifications, responses, IDs, params and error objects.
MCP communication uses JSON-RPC message structures. This validator checks common request, notification, response and error-shape problems before you debug them at runtime.
It validates message structure only and does not transmit the request anywhere.
Validate JSON-RPC 2.0 requests, notifications, responses, error objects, IDs, methods and params used in MCP communication.
Use MCP JSON-RPC Validator as a focused pre-flight utility while building, reviewing or debugging an MCP integration. Paste the relevant configuration, protocol message, metadata, schema or value into the tool and review the returned findings before the same data reaches a production client or server.
This validator is useful before configuration is committed, shared with another client or moved into production. Structural validation catches many integration problems early, but runtime behavior should still be tested with the exact client and server implementation you use.
A clean result means the input passed the rules implemented by this utility. It does not guarantee application security, protocol interoperability or correct business behavior. Test important integrations against the exact MCP client, SDK, gateway and server versions used in your deployment.