Convert YAML to .env Online
Twelve-factor apps, Docker containers and most modern runtimes read configuration from environment variables. If your source of truth is YAML, this converter flattens it into KEY=value lines you can drop into a .env file or pass to docker run --env-file. Nested keys upper-case and join with underscores: database.url becomes DATABASE_URL. Booleans and numbers stringify; lists collapse to comma-separated values.
YAML Converter - Convert Between Formats10 formats
Free YAML converter online. Convert YAML to JSON, XML, TOML, INI, Properties, CSV, and more. Also convert INI to YAML, TOML to YAML, and Properties to YAML. With automatic format detection.
Input (YAML)
Output (ENV)
Result will appear here
When you'd convert YAML to ENV
Real-world scenarios where this conversion is the right move.
Docker --env-file
docker run --env-file expects KEY=value lines. Convert your YAML config and pass it straight in.
Kubernetes ConfigMap from env file
kubectl create configmap --from-env-file consumes the same format. Generate it from a single YAML source.
Local development with dotenv
Sync .env files for local development from a shared YAML config so engineers do not maintain two copies.
YAML vs ENV — what changes
Quick reference for the structural differences between both formats.
| Aspect | YAML | ENV |
|---|---|---|
| Hierarchy | Nested. | Flat — KEY=value lines. |
| Naming | lower_case or camelCase. | UPPER_CASE by convention. |
| Types | Numbers, booleans, null distinguished. | All strings — consumer parses. |
| Special characters | Quoting rules in YAML 1.2. | Single or double quotes wrap values with spaces or special chars. |
Frequently asked questions
How are nested keys named?
Joined with underscores and upper-cased: database.url becomes DATABASE_URL. This matches the convention every dotenv loader expects.
What about lists?
Short lists serialize as comma-separated strings (FEATURES=a,b,c). Many runtimes parse this convention natively.
Does it preserve secrets safely?
The conversion runs in your browser — nothing is sent over the network. Still, never commit a .env with real secrets to version control.
Can I round-trip back to YAML?
Yes, with our env to YAML conversion, although deep hierarchy is reconstructed from underscore segments and may need a manual review.
Other conversions
Hop into another conversion that shares one of these formats.