Not a generic YAML validator: Compose Spec structure and semantic diagnostics. Data never leaves the client.
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CONTAINER_NAME_SCALEwebA fixed container_name prevents scaling the service (`docker compose up --scale`).
$.services.web.container_name
web-fixed
Remove container_name if you need scale. Example: ```yaml # remove container_name to allow scale: # container_name: web-fixed deploy: replicas: 2 ```
INTERPOLATION_PRESENTapiFound ${VAR} / $VAR. The browser cannot resolve host env — not an error; use `docker compose config` locally.
$.services.api.image
${API_IMAGE:-ghcr.io/example/api:latest}DEPENDS_ON_ORDER_ONLYweb"api": depends_on only controls start order, not readiness (accepting connections). The config is not necessarily broken.
$.services.web.depends_on
api
If readiness matters — healthcheck + condition: service_healthy. Example: ```yaml depends_on: postgres: condition: service_healthy # + healthcheck on postgres ```
INTERPOLATION_DEFAULTSUses ${VAR:-default} and/or ${VAR-default}. Defaults are visible in the file; avoid putting secrets in defaults.
$
API_IMAGE
EXTERNAL_NETWORK_UNVERIFIEDNetwork is marked external. Existence on the Docker host is not checked here.
$.networks.backend
backend