MCP Server Manifest Validator
Instantly validate your mcp.json configuration files against the official Model Context Protocol schema. Ensure a flawless connection with Claude Desktop.
mcp.json Validator
Why You Need an MCP Validator
The Model Context Protocol (MCP) is rapidly becoming the standard for connecting AI agents to local tools and data sources. However, configuring hosts like Claude Desktop requires writing a precise mcp.json configuration file. A single missing quote or incorrectly named property can cause the connection to silently fail.
Our Free MCP Server Validator eliminates the guesswork. By pasting your configuration into the editor, the tool instantly validates your JSON against the official MCP JSON schema. It checks for structural integrity, required fields like the execution command, and valid argument arrays.
100% Client-Side Privacy
We know your mcp.json often contains sensitive API keys and absolute file paths in the env object. That's why this tool operates entirely in your browser. We use local, client-side validation powered by Ajv. No data is ever transmitted to our servers.
Frequently Asked Questions
An MCP server manifest (usually mcp.json) is the configuration file required by MCP hosts like Claude Desktop to discover and run your local Model Context Protocol servers. It defines the command to run and any required environment variables.
The most common reason for an MCP server failing to connect is a malformed mcp.json configuration file. If the JSON syntax is invalid, or if required fields like 'command' or 'mcpServers' are missing, Claude Desktop will silently fail. Our validator checks against the official schema to catch these errors.
No. This MCP Validator runs entirely in your browser using local WASM-powered JSON schema validation. Your server configuration, including any sensitive environment variables or paths, never leaves your computer.