YAML to TOML Converter

TOML (Tom's Obvious Minimal Language) is a config file format designed to be easy to read and map unambiguously to a hash table. Unlike YAML, TOML has explicit types, no indentation-sensitive syntax, and avoids YAML's notorious edge cases (like the Norway problem where 'NO' parses as false). TOML is popular in Rust (Cargo.toml), Python (pyproject.toml), and Hugo configurations.

Use TOML when you want a config format that's explicit and hard to misread. TOML's type system is strict — strings are always quoted, booleans are always true/false, dates have a dedicated type. YAML is more flexible and supports complex structures like anchors/aliases, but its indentation-based syntax can cause subtle bugs. TOML is preferred for package configs (Cargo.toml, pyproject.toml) while YAML dominates CI/CD (GitHub Actions, Kubernetes).

Yes. YAML mappings become TOML tables (sections in square brackets). Nested YAML mappings become TOML dotted keys or nested tables ([section.subsection]). YAML sequences of objects become TOML arrays of tables ([[array]]).

TOML does not support YAML anchors (&anchor, *alias), custom tags (!!type), multi-document streams (---), or block scalars (| and >). Complex YAML merge keys (<<: *base) also have no TOML equivalent. This converter handles common single-document YAML configs but may not cover advanced YAML features.

This tool parses YAML entirely in your browser using a built-in parser — no server calls are made. It converts scalars (strings, numbers, booleans, nulls), nested mappings to TOML tables, and sequences to TOML arrays. The output follows TOML v1.0 spec syntax.