Enter a JSON-RPC error code to see its standard meaning and whether it belongs to the server-defined error range.
MCP uses JSON-RPC error structures. This utility explains standard parse, request, method, params and internal error codes plus the server-defined range.
Explain common JSON-RPC error codes used by MCP requests and responses.
Use MCP Error Code Explainer 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 developer utility is intended to shorten repetitive MCP setup and troubleshooting work. Review generated or normalized output before copying it into production because MCP clients may use implementation-specific configuration wrappers.
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.