YAML Config and API Patterns

app:
  name: Cheatsheet.today
  env: production
  features:
    ai_search: true
    premium_packs: true
  database:
    host: localhost
    port: 5432

# Structure app settings in a readable YAML document.

environments:
  development:
    log_level: debug
  production:
    log_level: info

# Model different settings by environment.

openapi: 3.1.0
info:
  title: ExpressYou API
  version: 1.0.0
paths: {}

# Show how YAML appears in API documentation.

swagger-cli validate openapi.yaml

# Check API spec correctness from the command line.

python - <<'PY'
import json, yaml, sys
print(yaml.safe_dump(json.load(open('config.json')), sort_keys=False))
PY

# Transform JSON into YAML output for config workflows.

yq -P -p=json '.' config.json

# Convert JSON input into YAML from the shell.

docker compose convert

# Render final service configuration from a YAML Compose file.

kustomize build overlays/prod

# Generate final Kubernetes YAML from base and overlays.