TOML to YAML Converter

# What Is YAML?

YAML (YAML Ain’t Markup Language) is a human-readable data serialization standard widely used for configuration, data exchange, and infrastructure-as-code files such as Docker Compose, GitHub Actions, Kubernetes manifests, and CI/CD pipelines. It uses indentation-based nesting instead of brackets, and supports anchors, aliases, complex keys, and multiple document separators.

Those extra features are powerful, but also make YAML a common source of subtle bugs. Converting from TOML produces clean, indentation-driven YAML where the original structure and typing are preserved without ambiguity.

# Why Convert TOML to YAML?

• Compatibility with a YAML ecosystem — Kubernetes, Docker Compose, GitHub Actions, and Terraform expect YAML. Convert only once here.
• Readability and tooling — Some editors, linters, and diff tools are YAML-first; a YAML file integrates with them natively.
• Richer serialization — YAML supports features (anchors, multiple documents) that TOML does not, letting you extend a config beyond TOML’s limits.
• Team conventions — Standardize on a single config format across your team’s projects without hand-editing each file.

# Common Use Cases

• Migrating a Rust Cargo.toml-style configuration to a YAML-based pipeline or orchestrator.
• Moving a Python application’s app.toml into an Ansible or Docker Compose environment that consumes YAML.
• Generating a readable YAML representation of an existing TOML template for documentation.
• Preparing TOML data to be merged with anchors and other YAML-only constructs.

# TOML to YAML Conversion Example

title = "Example config"

[server]
host = "127.0.0.1"
port = 8080
enabled = true

[server.ssl]
cert = "server.crt"
key = "server.key"

[[users]]
name = "ada"
level = 3

[[users]]
name = "grace"
level = 1

title: Example Application
server:
  host: 127.0.0.1
  port: 8080
  enabled: true
  ssl:
    cert: server.crt
    key: server.key
users:
  - name: ada
    level: 3
  - name: grace
    level: 1

Notice how nested tables become nested blocks and [[array-of-tables]] becomes a YAML sequence of maps — structure and data types survive the conversion unchanged.

# Other Data Format Converters

If you convert data formats regularly, these related tools will also save you time: