Kubernetes YAML Validator

The Kubernetes YAML Validator analyzes YAML manifests used for Kubernetes resources and provides deterministic feedback on correctness and readiness for deployment. It targets developers, DevOps engineers, and SREs who author or audit manifests for Deployments, Services, ConfigMaps, Ingresses, CRDs, and custom resources, helping them catch issues early in development and CI workflows. The validator supports configurable strictness, enabling warnings for unknown fields or deprecated API versions, and can be used in pre-commit hooks or CI steps to enforce policy.
Conceptual workflow: a YAML parser ingests the input and builds a structured representation, then a domain validator enforces Kubernetes-specific rules (apiVersion, kind, metadata, spec) and checks required fields, data types, and value formats. It supports multi-document files separated by '---', reports the exact document index and line/column of each issue, and can optionally fetch remote OpenAPI schemas to validate fields against current API definitions. If network access is unavailable, it gracefully falls back to syntax and structural checks.
Core value and features: precise error reporting with line/column, error codes, and actionable suggestions; optional deep validation against a subset of Kubernetes OpenAPI schemas; outputs include a machine-readable JSON report and a human-friendly summary suitable for review. It offers a dry-run mode, strict mode, and integration hooks for CI, making results deterministic for automation.
Use cases: pre-commit validation, CI checks, audit of manifests across environments, and policy enforcement to avoid deprecated APIs. Beneficiaries include developers, platform engineers, and SREs seeking faster feedback loops and reduced deployment failures. Examples include validating a Deployment manifest in a PR, validating all resources in a rendered Helm chart, or auditing manifests against a cluster version to detect deprecated API usage.