TOML to YAML Converter
Convert TOML (Tom's Obvious, Minimal Language) configuration files to YAML format. Perfect for migrating Rust/Python configs to Kubernetes, Docker Compose, CI/CD pipelines, and other YAML-based systems.
Conversion Options
Recommended Settings
TOML to YAML Migration
- •Perfect for converting Cargo.toml or pyproject.toml to YAML-based CI/CD configs
- •TOML tables become YAML nested objects with indentation-based syntax
- •Array of tables [[section]] converts to YAML arrays of objects
- •Use block style (default) for readable configs, flow style for compact output
- •Document separator (---) is optional but common in Kubernetes and multi-doc YAML
YAML Format Best Practices
- •2-space indentation is YAML standard (not tabs - YAML forbids tabs)
- •Block style is more readable for configs, flow style saves space
- •Quote style 'auto' minimizes quotes - only when necessary for parsing
- •Line width 80 for git diffs, 120 for wider screens, unlimited for no wrapping
- •No array indent aligns list items with parent key (YAML 1.2 style)
Pro Tips
- •TOML nested tables become YAML nested objects automatically
- •TOML dates convert to YAML timestamps in ISO 8601 format
- •Sort keys option creates alphabetically ordered YAML for consistent diffs
- •All conversion happens client-side - your config files never leave your browser
Most Popular
2-space indent with block style and auto quotes for clean, readable YAML
When to Use This Tool
Convert TOML configs to Kubernetes YAML manifests for deployments, services, and configs. TOML's readability for editing combined with YAML's Kubernetes standard creates flexible configuration workflows.
Transform TOML to YAML for GitHub Actions, GitLab CI, CircleCI, or Azure Pipelines. Modern CI/CD systems use YAML for workflow definitions. Convert your TOML project configs to pipeline-ready YAML.
Generate docker-compose.yaml from TOML configs. Docker Compose uses YAML for service definitions. Convert TOML application configs to Docker Compose format for containerized deployments.
Convert TOML configs to Ansible YAML playbooks for infrastructure automation. Ansible exclusively uses YAML for playbooks, roles, and inventory. Transform TOML configs to Ansible-compatible YAML.
Generate OpenAPI YAML specifications from TOML configs. OpenAPI 3.0+ uses YAML for API documentation. Convert TOML-based API configs to standard OpenAPI YAML format.
Migrate from TOML-based tools (Rust/Python) to YAML-based systems. When moving between ecosystems or frameworks, convert TOML configs to YAML for compatibility with new tools and platforms.
How It Works
Parse TOML input using robust TOML parser
Validate TOML syntax and structure
Sort keys alphabetically if option enabled
Convert TOML tables to YAML nested objects
Transform TOML array of tables [[section]] to YAML arrays
Apply formatting options (indent, line width, quote style)
Generate YAML using js-yaml library with specified options
Add document separator (---) if enabled
Copy to clipboard or download as .yaml file
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Frequently Asked Questions
How are TOML tables converted to YAML?
TOML tables with [section] headers become YAML nested objects using indentation. For example, [database] becomes 'database:' with child keys indented below. Nested tables like [database.connection] become nested YAML objects with deeper indentation.
What happens to TOML array of tables [[section]]?
TOML array of tables [[section]] converts to YAML arrays of objects. Each [[servers]] entry becomes an array item prefixed with '-'. The YAML output preserves the array structure with proper indentation for readability.
When should I use block style vs flow style?
Use block style (default) for readable configs with one key per line. Flow style [1,2,3] or {a:1} is compact for small arrays/objects. Block is standard for Kubernetes and CI/CD. Flow saves space in documentation or compact configs.
What does 'no array indent' mean?
By default, YAML array items are indented more than their parent key. 'No array indent' aligns the array items with the parent key (YAML 1.2 style). This is common in Kubernetes configs where array items align with the parent.
When do I need the document separator (---)?
The document separator '---' marks the start of a YAML document. It's optional for single documents but required for multi-document YAML files. Kubernetes manifests often include it. Use it when your YAML will be concatenated with other documents.
How are TOML data types preserved in YAML?
TOML strings, integers, floats, booleans, and dates convert directly to YAML equivalents. YAML preserves type information naturally (unlike JSON/XML). TOML dates become YAML timestamps. No type attributes needed.
Can I convert Cargo.toml or pyproject.toml files?
Yes! This tool handles any valid TOML file including Cargo.toml (Rust dependencies), pyproject.toml (Python projects), or custom app configs. Paste the entire file contents and get properly formatted YAML with all sections preserved.
Is my configuration data secure?
Absolutely! All conversion happens entirely in your browser using client-side JavaScript. Your TOML config files (Cargo.toml, pyproject.toml, etc.) never leave your computer or get sent to any server. Works completely offline after loading.