YAML Schema Validation: JSON Schema vs CUE
Validate YAML files against a schema using JSON Schema, CUE, or yamllint. Catch type mismatches and required-field violations in CI pipelines.
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Tags: yaml, validation, schema
YAML Schema Validation: JSON Schema, CUE, and yamllint Compared A YAML file that parses without errors is not a valid configuration. It's a structurally valid YAML document — which is a much weaker guarantee. Required fields might be missing. A port number might be a string instead of an integer. An enum field might contain an unrecognized value. Without schema validation, these errors show up at runtime, often in production, often at the worst time. This guide covers the four main tools for YAML schema validation, what each catches, and how to integrate them into your workflow. --- The Problem: YAML Is Structurally Permissive Consider this Kubernetes-like config: parses this without error. Your application receives as the string instead of integer , crashes on startup, and the error…
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