A ConfigMap is how Kubernetes carries configuration into your pods without baking it into container images. Instead of rebuilding an image every time a feature flag, log level or connection string changes, you put that data in a ConfigMap and mount it or inject it as environment variables — so the same image runs in dev, staging and prod with different settings. The ConfigMap YAML Generator writes that manifest for you from a simple key/value form.
You give the ConfigMap a name and, optionally, a namespace and labels, then add as many data entries as you need. Each entry is a key and a value; the key becomes the filename when the ConfigMap is mounted as a volume, and the value is the file content or the environment variable value. Because the form is just key/value rows, you can paste an entire settings block in one place and see it reflected in valid YAML immediately.
Multi-line values are handled properly. Any value that contains a newline — a full nginx.conf, a JSON snippet, a .env file — is emitted as a YAML block scalar using the pipe (|) style, so line breaks and indentation are preserved exactly instead of being flattened onto one line. Plain single-line values are written as normal scalars, and values that need quoting (those containing : or leading/trailing spaces) are quoted automatically, so the output is always valid YAML.
The name is validated as a proper RFC 1123 label and at least one data key is required before any YAML is produced; problems are reported in a clear message panel. The preview updates as you type, and a small statistics strip shows how many data keys and labels the ConfigMap carries. You can copy the manifest, download it as configmap.yaml, or print it.
Everything runs locally and nothing is uploaded, which matters because configuration sometimes contains internal hostnames or endpoints. Use a ConfigMap for non-sensitive settings only; for passwords, tokens and certificates use a Secret instead, since ConfigMaps are not encrypted at rest by default and are readable by anyone with get access in the namespace. Once downloaded, apply it with kubectl apply -f configmap.yaml, ideally after a kubectl apply --dry-run=server check.