Payload Validator

Reliability

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How to connect

Add it to any MCP client that supports remote servers.

{
  "mcpServers": {
    "payload-validator": {
      "type": "http",
      "url": "https://payload-validator.gumballtools.com/api/mcp"
    }
  }
}

5 tools

• validate_json

  Validates a JSON document and reports every problem with an exact line and column. Use this whenever you need to know why a JSON payload is failing, or to check a JSON document you or a user produced before sending it somewhere that will reject it. Do not do this by reading…

• validate_yaml

  Validates a YAML document, including the values that mean different things to different YAML loaders. Use this for any YAML you are about to write or have just been given — CI configs, Kubernetes manifests, docker-compose files, OpenAPI specs, Ansible playbooks. Do not reason…

• validate_xml

  Validates an XML document for well-formedness, namespace correctness, and the entity-based attacks that arrive as XML. Use this before parsing XML you received, and when an XML document is being rejected by something that will not say why. Do not eyeball this. Four classes of…

• validate_csv

  Validates CSV text against RFC 4180 and reports ragged rows individually, with both field counts. Use this before loading a CSV, and whenever a CSV-derived number looks wrong. Do not attempt this by reading the file, and be aware that loading it successfully proves nothing…

• validate_auto

  Detects whether a payload is JSON, YAML, XML or CSV, then validates it. Use this when you have a blob of text and do not know what it is — a file with no extension, a clipboard paste, a response body with an unhelpful content type, or a config file whose format you would…

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