MCP Config Validator

## What this tool does A small mistake in an MCP configuration is a common reason a server fails to connect. This validator takes your mcpServers JSON, parses it, and reports errors and warnings so you can fix problems before you hand the config to a client. ## What it checks - **Valid JSON:** it reports syntax errors with a hint about where they occur. - **Wrapper:** it confirms the config has an mcpServers or servers object. - **Transport shape:** for each server it checks whether the entry is a local stdio server (it has a command) or a remote server (it has a url), and flags entries that have neither or both. - **Common mistakes:** it catches typos such as httpUrl instead of url, an args value that is not an array, a missing command, and a remote URL served over plain http. - **Secrets:** it scans environment variables and headers for values that look like hard-coded tokens or keys and recommends using an environment variable reference instead. ## How to use it Paste your config into the box. The validator runs as you type and shows a list of errors in red and warnings in yellow, or a green looks-valid state. Everything runs in your browser, so your config is never uploaded. ## Why secrets matter A config committed with a real API key leaks that key to anyone who can read the repository. Keep secrets in environment variables and reference them from the config. ## Related Learn how to write these configs in the first place with our MCP server guide and the MCP Server Config Generator.