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YAML ↔ TOML Converter
The YAML TOML Converter helps developers, DevOps teams, documentation writers, and people working with configuration move data between two human-readable formats. YAML is common in Kubernetes manifests, CI pipelines, Docker Compose files, and application settings. TOML is widely used in Rust projects, CLI tool configuration, static site generators, and Python packaging. The tool is useful when a project changes its configuration standard, when an example from one ecosystem needs to be adapted to another, or when TOML’s table syntax makes nested settings easier to scan.
Paste YAML and choose YAML to TOML to create TOML tables, arrays, strings, numbers, and booleans. Paste TOML and choose TOML to YAML to produce an indentation-based YAML document. Conversion runs on the server and returns formatted output or a generic error message when the input cannot be processed safely.
Example YAML:
app: Calculyo
database:
host: localhost
port: 5432
converts to TOML:
app = "Calculyo"
[database]
host = "localhost"
port = 5432
TOML intentionally has no null value, so YAML containing key: null cannot be converted without changing the data model. In that case the converter reports an error instead of silently dropping information. Arrays of maps are emitted as TOML array-of-table blocks, while nested maps become TOML table headings. The best inputs are configuration-shaped documents with string keys, scalar values, arrays, nested maps, and repeated records.
Because YAML and TOML differ in syntax and supported data types, always review generated configuration before using it in production. This tool is meant for fast, practical conversion and inspection, not as a replacement for schema validation performed by the target application.
live_help Frequently Asked Questions (FAQ)
What is the difference between YAML and TOML?
YAML uses indentation and supports broad data structures, including null values, lists, maps, and aliases. TOML uses a more table-oriented syntax and is designed mainly for configuration files. YAML is common in Kubernetes, Docker Compose, and CI pipelines, while TOML is common in developer tooling, project metadata, and command line applications.
Can every YAML file be converted to TOML?
No. TOML has no native equivalent for null and does not support every YAML feature. If converting a value would lose information or change the meaning of the data, the tool shows an error instead of generating output that looks valid but is misleading.
How are nested maps converted?
Nested YAML maps become TOML sections. For example, a database map with host and port fields becomes a [database] section containing host = "..." and port = ... entries.
What does a basic conversion look like?
This YAML:
name: demo
enabled: true
converts to TOML:
name = "demo"
enabled = true
How are arrays of objects handled?
Arrays containing maps are emitted as TOML array-of-table sections such as [[servers]]. Arrays of strings, numbers, and booleans remain regular inline arrays because TOML represents those cleanly on one line.
Is it safe to paste secrets?
The converter processes the submitted text to produce the result. Even so, avoid pasting production secrets, private tokens, or credentials into any web form unless your organization explicitly allows it.
How are TOML dates handled when converting to YAML?
Dates are common in TOML configuration files, but YAML consumers vary in how they interpret date-like values. The converter keeps those values as text to avoid an unexpected data type change.