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Convert between TOML, JSON, and YAML in any direction. Use for multi-format configs; for single-pair JSON-YAML use json-to-yaml. Input: TOML/JSON/YAML ≤10MB. Returns converted text or parse error. 100% client-side.
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Three-way TOML ↔ JSON ↔ YAML converter with automatic input format detection. Provides output-specific formatting options (indent size, key sorting, trailing commas for JSON, line width for YAML). Includes copy-to-clipboard and download-as-file functionality for each output format.
Configuration files commonly exist in TOML, JSON, or YAML, but teams and tools require different formats. This converter bridges all three so users can seamlessly translate between them without remembering format-specific syntax rules.
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Backend developers, DevOps engineers, and configuration managers who work with config files across tools that use different formats (e.g., Python TOML, JS JSON, CI YAML).
Paste TOML, JSON, or YAML content into the input area — the format is auto-detected from the first non-whitespace character.
Select the target output format: TOML, JSON, or YAML.
Configure output options: for JSON choose indent (2/4/tab) and key sorting; for YAML set indent and line width.
Click Convert; the output appears in the result panel with syntax highlighting.
Click Copy to copy the converted result to your clipboard.
Click Download to save the output as a .toml, .json, or .yaml file.
Input (TOML): "[server]\nhost = \"localhost\"\nport = 8080" → Output (JSON): {"server": {"host": "localhost", "port": 8080}}Input (YAML): "server:\n host: localhost\n port: 8080" → Output (TOML): "[server]\nhost = \"localhost\"\nport = 8080"Are comments preserved during conversion?
Comments are preserved only when the source and target are the same format (e.g., YAML → YAML). Cross-format conversions strip comments.
Does it handle nested TOML tables? Yes
TOML tables like [server.database] are converted to nested objects in JSON/YAML.
What happens with TOML inline tables vs. standard tables?
Both are supported and produce equivalent nested output in JSON/YAML.
Can I convert very large files?
Files up to 10MB are supported; larger files may cause performance issues in the browser.
Authoritative specifications, standards, and in-depth reading for TOML/JSON/YAML Converter.
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Learn the concepts behind this tool.
YAML
YAML Ain't Markup Language is a human-readable data serialization format using indentation to denote structure. It is widely used for configuration files in DevOps workflows.
View in glossary →TOML
Tom's Obvious Minimal Language is a configuration format designed to be unambiguous and map cleanly to hash tables. Cargo and many Rust tools use TOML for settings.
View in glossary →