Payload Validator for ChatGPT

com.gumballtools/payload-validator

Validate JSON, YAML, XML and CSV with exact line/column errors and silent-corruption warnings.

client:ChatGPT transport:streamable-http tools:5

Install Payload Validator in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://payload-validator.gumballtools.com/api/mcp

Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs