Docker Compose Env Interpolation Preview

Resolve Compose variables against pasted env values.

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Sample inputs
Compose
Docker Compose YAML:
services:
  web:
    image: ${IMAGE:-nginx}
    environment:
      API_URL: ${API_URL?required}

Environment
Environment values:
IMAGE=app:latest
API_URL=https://api.example.com

Generated result
Summary: Compose interpolation preview complete. No issues found.

Stats
- Env Keys: 2

Issues
- No issues found.

Output
services:
  web:
    image: app:latest
    environment:
      API_URL: https://api.example.com

• Compose body and env sections

  Compose YAML and env values are separated so interpolation can be previewed locally.

• Default operators

  Common default forms such as VAR:-fallback are resolved when an env value is blank or missing.

• Required variables

  Required variable markers are reported as errors when no value is supplied.

• Undefined variables

  Unset variables without defaults are reported and substituted with an empty string.

• Preview scope

  The tool previews string interpolation only; it does not run Docker Compose or validate full YAML semantics.