Kustomize Output Previewer / Flattener

kustomize build resolves a kustomization into flat manifests, but you need the CLI and the files on disk. The Kustomize Output Previewer / Flattener does the common transforms in the browser: paste your kustomization.yaml and the resource manifests, and it applies namePrefix, namespace, commonLabels and commonAnnotations, then shows the flattened multi-document result.

Toggle each transform, and the tool merges commonLabels into metadata.labels, selector matchLabels and pod-template labels (with common labels winning on conflict), sets the namespace, and prefixes resource names. Bases, patches and generators are intentionally not resolved - this is a preview of the straightforward transforms.

Everything runs locally and nothing is uploaded.

• namePrefix - prepended to metadata.name.
• namespace - set on metadata.
• commonLabels - merged into labels + matchLabels + template labels.
• commonAnnotations - merged into metadata.annotations.
• Flat output - one multi-document YAML.
• Copy / Download / Print - get flattened.yaml wherever you need it.

1. Paste the kustomization.yaml.
2. Paste the resources (multi-doc).
3. Toggle transforms and flatten.

Example 1 - prefix. namePrefix dev- on myapp.

Example 2 - labels. env: dev merged into labels.

Example 3 - namespace. ns prod set.

• Preview - see flattened output instantly.
• Transforms - the common ones applied.
• Selective - toggle each transform.
• No CLI - browser only.
• Private - everything runs in the browser.
• Copy, download or print - get the manifest where you need it.