The mermaider is an MCP server that provides validate_syntax tool that checks all Mermaid diagram types for syntax errors.
The is an MCP project maintained in the vtomilin/mermaider repository. The maintainer describes its purpose as “The mermaider is an MCP server that provides validate_syntax tool that checks all Mermaid diagram types for syntax errors”. Read the project documentation for the complete scope.
The documented npm package is @vtomilin/mermaider. The configuration below comes from the maintainer’s example; adapt its paths and account values to your environment.
Project documentation · Repository · Discovery listing. This profile records the public documentation checked on 2026-10-08.
{
"mcpServers": {
"mermaider": {
"command": "npx",
"args": [
"-y",
"@vtomilin/mermaider",
"/home/user/etc/Firefox.json"
]
}
}
}From the project documentation. Replace placeholders and example paths before connecting.
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