validate-mcp

MCP server: validate JSON data against a JSON Schema. Backed by ajv + ajv-formats. Returns every error (not just the first) with a JSON-pointer path so the model can fix the offending field.

Tool

validate

{
  "schema": {
    "type": "object",
    "properties": { "name": { "type": "string" }, "age": { "type": "integer" } },
    "required": ["name"]
  },
  "data": { "age": "thirty" }
}

→

{
  "valid": false,
  "errors": [
    { "path": "",     "keyword": "required", "message": "must have required property 'name'", "schema_path": "#/required" },
    { "path": "/age", "keyword": "type",     "message": "must be integer",                     "schema_path": "#/properties/age/type" }
  ]
}

Supports draft-07 / 2019-09 / 2020-12 schemas and the standard formats (email, uri, uuid, date-time, etc.) via ajv-formats.

Configure

{ "mcpServers": { "validate": { "command": "npx", "args": ["-y", "@mukundakatta/validate-mcp"] } } }

License

MIT.