MCP Server Config Validator
Validate MCP server configs for command, URL, args, env values, and transport mistakes before sharing them.
Also useful for: mcp server config validator mcp config validator mcp json checker model context protocol config MCP Server Config Validator
MCP Server Config Validator
Runs in your browser. Inputs are not uploaded.MCP Server Config Validator Example Run
Review mixed local and remote MCP server config before sharing it.
Sample inputs
{"mcpServers":{"search":{"command":"npx","args":["-y","mcp-server-search"],"env":{"API_KEY":"sk-test-1234567890"}},"remote":{"url":"http://localhost:8787/mcp"}}}
Generated result
Summary: 2 MCP servers checked. 1 warning.
Stats
- Servers: 2
Issues
- Warning: search.env.API_KEY looks sensitive. Prefer local env injection over shared config.
Output
search: stdio server
remote: remote HTTP/SSE server
[WARNING] general: search.env.API_KEY looks sensitive. Prefer local env injection over shared config. What the MCP Server Config Validator Checks
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Config JSON shape
The validator expects a JSON object with MCP server entries that can be inspected independently.
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Stdio server fields
Local servers are checked for command, args, and env values that are commonly mistyped.
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Remote server URLs
URL-based entries are checked for URL shape and obvious transport mistakes.
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Environment secrets
Env values are scanned for API keys and tokens that should not appear in public snippets.
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Client portability
The report focuses on common config mistakes, not every client-specific setting.
MCP Server Config Validator Questions
- Q: Does the MCP server config validator upload my MCP config? A: No. Inputs are processed in your browser, and pasted content is not sent to analytics or a server.
- Q: What should I paste into the MCP server config validator? A: Paste MCP client or server config JSON, such as an mcpServers object with command, args, env, or url fields.
- Q: What can I copy or download? A: You can copy the validation report and use it as a checklist before moving the config into a client.
- Q: What does the MCP server config validator not verify? A: It does not launch the server, install packages, authenticate remote transports, or guarantee compatibility with every MCP client.
Related Tools
Updates
- v1.0.0 New 2026-05-17: Initial MCP config JSON validation, transport checks, and secret warnings added.